UNDERVERSE (full version)

A heated exchange ensues between them: X!Toriel accuses Toriel of ingratitude for rejecting his attempt to "free" them. Toriel, fueled by anger and understanding, gains the upper hand, but just as she begins to gain the upper hand, X!Azgore confronts her. He challenges her with a furious statement, condemning his wife for being too soft.
Chaos and Other Timelines. In the midst of events, Undyne desperately fights to protect Alphys from X!Undyne's relentless pursuit. Their battle intensifies until Undyne attempts to escape. In the original universe, X!Gaster holds the original Frisk captive. Frisk begs X!Gaster to take their power and spare the rest of the universe. As X!Gaster prepares to strike, Frisk whispers a final request (its true nature remains a mystery). At that moment, Ink Sans and Classic Sans arrive, determined to confront X!Gaster. X!Gaster calmly declares that he no longer needs Ink and pierces Frisk with a brutal blow, taking their power for himself.

The plot: The main universe is completely under X!Gaster's control.
Ink Sans and Classic Sans meet. Ink tries to convince Classic to join the fight against X!Gaster. Classic coldly refuses: he's already found his other half and a "home"—that's all he ever wanted. When Ink shares his plan, Classic bluntly tells him to leave. But when Ink asks about Frisk, Classic indifferently replies that X!Gaster took them. Ink sees this as a slight concern and decides it's enough to act. He grabs Classic and throws him to confront X!Gaster.
Cross's scene. Meanwhile, Cross suddenly teleports to a secluded location where X!Gaster and his creations are already located. He expresses frustration: no matter where he runs, he always ends up in the same place. A tense argument ensues between Cross and X!Chara about their failures, but X!Gaster interrupts the argument. He calmly challenges them both to try and harm him, making it clear that his creations will always intervene to protect their creator.
X!Toriel's False Reality. Tensions mount, and X!Toriel suddenly transforms the rest of the space into a false reality. Some characters are transported there. Cross and X!Chara revert to their younger selves and find themselves facing a calm but anxious X!Toriel. Meanwhile, Papyrus engages in an off-screen battle with X!Papyrus. Toriel, sensing a strong presence, turns away from Alphys. As she approaches, she begins to realize: the closer she gets to X!Toriel, the more vivid her own memories and emotions become. Eventually, she comes face to face with a young Asriel and Chara—she sees her children's original universe. Toriel quickly realizes: this reality is merely a construct created by X!Toriel to trap them in her best memories and emotions, offering the illusion of "eternal freedom." Enraged by the manipulation, Toriel reveals the truth and confronts X!Toriel.

The action takes place in the main universe, where XGaster has taken control of the situation.
An emergency broadcast is broadcast across the city: an army of humans is pursuing suspects in a recent attack. Undyne volunteers to assist law enforcement. Big Dog sends her to the last known location of the enemy. Papyrus and Asgore decide to head out by car to search for survivors, while Toriel and Alphys stay behind to treat the wounded.
At the communications tower, Undyne encounters XTale!Muffet and her new pets, who turn out to be rewritten versions of the original Muffet and her creature. XTale!Mettaton joins the fight, and later, the deactivated Mettaton joins in. Undyne demands the rewritten version tell her what happened to her own Mettaton and imprisons him in spears.
XTale!Muffet spreads her webs across the city to draw the souls of infected residents to the battlefield. Mettaton absorbs all these souls and enters overload mode. Using this power, he initiates a process XTale!Alphys describes as "global spread"—enveloping the entire world in XGaster's power.
Throughout the city, countless eyes focus on Frisk. This is because XGaster plans to reveal the truth behind his timeline. Sans, through one of his eyes, repeats to Frisk that XGaster has already won. XGaster attempts to prove this by rewriting the timeline: he implants in every citizen memories of their past actions (pacifist, neutral, or genocidal), in which they were already killed by Frisk.
Despite this, monsters continue to battle their doppelgangers throughout the city. XTale!Chara tries to fight back against XGaster, but his energy quickly runs out.

Plot
The episode begins with XGaster having completely taken over the main universe.
Ink Sans meets with Classic Sans and tries to convince him to join the fight against XGaster. However, Classic Sans coldly refuses, claiming that he has already found his soulmate and his home—and that's all he ever wanted. When Ink asks about Frisk, Classic Sans indifferently replies that XGaster has captured them. Ink, noticing this, insists that worrying about Frisk is reason enough to act, and grabs Classic Sans to rush towards the villain.
Cross is suddenly teleported to a secluded location where XGaster and his creations are located. He is irritated that no matter where he runs, he always ends up in the same place. He and XGary's Chara engage in a tense argument about their failures, but their quarrel is interrupted by XGaster himself. He coldly challenges them both, making it clear that his creations will always intervene to protect their creator.
Tensions mount when XGary's Toriel suddenly transforms the surrounding space into a false reality. Several characters are transported into this constructed reality. Cross and XGary's Chara find themselves as their younger selves, standing before a calm but terrifying XGary's Toriel. Meanwhile, Papyrus engages XGary's Papyrus off-screen. Toriel, sensing a powerful presence, turns to XGary's Toriel. As she approaches, she begins to realize that the closer she gets to XGary's Toriel, the more vivid her own memories and emotions become. Faced with a young Asriel and Chara, she realizes that this reality is merely a construct created by XGary's Toriel to trap them in their own best memories and emotions, offering the illusion of "eternal freedom." Toriel, fueled by anger and realization, gains the upper hand over XGary's Toriel, but at that moment

Nightmare warns Cross that he will return.
The finale. XGaster decides to cross over to the Omega Timeline, once again taking control of Cross's body. He answers questions from Core!Frisk and Dream. Afterward, Cross leaves with Fresh to go to the Anti-Void. The episode ends with XGaster telling Xchara to "shut up" and drawing symbols on his hand, likely related to Xandine and XPapyrus traveling to the Undertale universe.

The main universe is in chaos. Due to the actions of XGaster, XMuffet, and XMettaton, chaos erupts throughout the city. People turn to Frisk, questioning why the monsters are wreaking havoc. In response, XGaster offers Frisk the only way to save themselves—OVERWRITE—but Frisk categorically refuses.
Cross and Dream arrive. The heroes arrive in the Omega Timeline and discover that the AU's inhabitants, including Error!Sans, have been exterminated.
Dialogue with CORE!Frisk. CORE!Frisk tries to explain to Cross why they're interfering in his affairs, but he's on edge. Dream asks Cross to calm down, but this only irritates him further.
Cross's Reflections. Leaving his companions behind, Cross wanders off alone. Later, Epic!Toriel strikes up a conversation with him, and then CORE!Frisk appears. He tells Cross the story of XGaster and encourages him to choose his own destiny.
Sleep and inner conflict. After Frisk leaves, Cross falls asleep under a tree. Due to the overwhelming power granted by XGaster, he creates an illusory world around himself.
A battle with Nightmare!Without and Killer!Without. Suddenly, Cross and Dream are attacked. A fight ensues between Killer and Dream on one side, and Cross on the other. During the battle, Nightmare attempts to awaken negative emotions in Cross, while Killer, using slow motion, puts intense pressure on Dream.
XGaster Control. XGaster then temporarily takes control of Cross's body and engages Killer in combat until he retreats.
An emotional crisis and an alliance. After this, Xgaster leaves Cross's body. Cross, feeling responsible for his friend's death, begins to cry, blaming himself. However, Dream's positive emotions help Cross not give up.
The unification and final showdown. Cross and Dream unite. Watching this, Nightmare decides to intervene and engages both of them. During the battle, the inhabitants of the Omega Timeline awaken light within Dream, and he fires his light arrow at Nightmare. The resulting powerful attack leaves half of Nightmare's body damaged.

Denouement
Despite their heroic efforts, the Classic characters are defeated and presumably killed. In the house, Classic!Alphys panics, having lost contact with Classic!Mettaton, but Classic!Undyne reassures her that Mettaton "will be fine."
Classic!Frisk declares they won't "just stand there" and, with the support of the other Classic characters, charges into the chaos. XGaster, who was aware of the situation, comments on this decision, "This just makes my job easier."
The episode ends with Classic!Sans sitting alone outside the ruined city with a box of fries, dejectedly ignoring the events.

Beginning of the episode
The action begins with Classic!Sans returning home. Having changed into a new jacket, he engages in a tense conversation with Classic!Frisk, reminding them of their promise and sharing his feelings about their adventures. Sans then heads off to see Grillby.
Meanwhile, Frisk is talking to Chara about the Overwrite button. Their conversation is interrupted by the appearance of XGaster. He's aware of the "incident"—the event from the episode "Owners," where Sans killed Frisk during his genocidal rampage, causing the timeline to reset and making Sans their owner.
XGaster invites Frisk to join him, but she declines, having discerned the invader's true, destructive intentions. The episode ends with XGaster's line: "There's no middle ground between perfection and failure."
Invasion and Conflict
Soon, other characters from XTale arrive in the main universe, including Ink!Sans. Ink recalls his previous stunt and asks XGaster about his plans for "Phase 3." He evades the question, merely stating that he doesn't like to rush.
Ink then gets into an argument with XChara, commenting on his adult form. Chara becomes enraged and prepares to attack Ink, but is stopped by his own brother. Realizing the human is uncooperative, Ink asks XGaster about a "Plan B," but XTale!Alphys sternly replies, "There is no Plan B."
Chaos in the city
Meanwhile, in Classic! City, Mettaton is filming a TV show with Burgerpants and Harper at the Classic! Muffet bakery. Suddenly, the lights go out, an earthquake occurs, and a powerful purple explosion engulfs the entire city. Rushing outside, Mettaton sees a fleeing crowd and hears an insult from a man who yells at him and all the monsters, "Go to hell!"
Harper notices that XTale!Mettaton and XTale!Muffet are behind all this chaos. They are attacked by Classic!Mettaton, and it turns out their XTale counterparts are also there. Despite their surprise, the XTale characters ignore this and engage their Classic counterparts in battle.

Main events of the episode
Preparations are underway for the revival of XGaster. Meanwhile, XTale!Alphys quarantines the distorted timelines created by X-Event.
Conflict with Nightmare!Sans. X-Event!Chara, still recovering from the events of Underverse 0.3, encounters Nightmare!Sans. Knowing all about his past and his AU, Nightmare becomes enraged. Nightmare demands that they go to Ink!Sans' location to retrieve the vial. He declares that Chara is his property, and his control over him is so strong that he is willing to kill him.
The Three Sanses Meet. After Nightmare takes the things, the three Sanses discuss what happened. One of them, Sans, vows to find Ink!Sans.
Searching for Ink!Sans. When Sans enters the city, he is found by Sans from Outertale. Together, they set out to find Ink!Sans. During their conversation, Sans from Outertale mistakes Killer!Sans for Ink!Sans. Meanwhile, Nightmare attempts to force Chara to use her "monster soul."
Error!Sans' reaction and the finale. Error!Sans, in response to XGaster's proposal, rejects his plan and destroys the multiverse. Ink!Sans captures him and imprisons him in his dimension. XGaster takes X-Event's soul and the other half of his own, resulting in X-Event!Chara's death, leaving no soul to capture.

Summary
In his hideout, Error!Sans receives a surprise visit from Ink!Sans. He reveals his plans to get rid of Error, citing the truce they had reached. However, Ink!Sans reminds him about the show starting, and they begin watching.
The plot of the Undernovela episode is as follows: FRISK is kidnapped, and Asgoro and Sin quarrel over the latter's marriage to Toriel. The kidnappers are Cross and X-Event!Chara. While they watch, Error notices anomalies in the show related to Cross. As Asgoro and Sin try to stop Cross!Sans and Cross!Chara, Ink!Sans appears and erases them using a vial containing X-Event!Chara's soul.
XGaster orders Error to wake up, claiming the game is getting more interesting. Upon awakening, Error realizes it was all a nightmare. He concludes that Cross's soul has faltered and heads to the Doodle Sphere to continue his destructive activities.
Back in XTale, Error encounters Fresh, who rudely demands he leave. Looking behind Fresh, Error sees the Underswap symbols (minus Underswap!Papyrus, Underswap!Enchantment, and Underswap!Without) and Snowdin from Underfell—all malfunctioning. With this discovery, he finally breaks the truce with Ink!Sans, proclaiming, "OUR TRUCE... IS OVER."

The plot revolves around a conflict involving XChara. Here's how it plays out:
XChara takes 99% of the soul from SwapCharas. After this, UnderSwap!Sans reaches his limit and tries to fight back against XChara.
XChara has a special button—the overwrite button (referred to in the episode's terminology as the "UnderSwap button"). Using it, XChara subjugates UnderSwap!Sans, placing him under the antagonist's complete control.
Under the influence of XChara's power, UnderSwap!Sans and his brother UnderSwap Papyrus transform into "dust monsters." In this state, they begin attacking XChara himself.
At the climax, XChara temporarily retreats. Then UnderSwap Sans abandons his ally (XChara) and teams up with other heroes—Ink!Sans, Sans, and Red (Underfell Sans). Their goal is to restore balance to the universe (the underverse).
At the end of this part, Svapchara and SvapPapyrus die.

Beginning. The action picks up after the events of the Ink!Sans episode. X-Event!Chara grows impatient with Cross's actions and decides to take matters into her own hands: she attempts to seize control and acquire a human soul. However, she is stopped.
Subsequent events. After his failure in Underfell, Cross finds himself in a difficult situation. Nightmare initially scolds him for his actions, but after listening to Cross's ambitions, he calms down. Ultimately, he takes Cross with him to Underswap.
In Underswap, Papyrus (from this universe) mistakes Cross for his brother and exposes him to others. But due to the strong similarity of his code to his brother, Cross continues to follow Nightmare's plan.
The conflict escalates. Sans (from the main universe) and Underfell!Sans distract Cross, preventing him from harming Underswap. However, the victory proves Pyrrhic: Cross!Chara is revived, fueled by Underswap!Chara's soul.
Climax. X-Event!Chara begins his series of actions in the Underswap universe. He uses the power of overwriting to subjugate the characters. At one point, he enlists the cast to deal with Ink for the White Vial, and later engages in battle with Underswap!Sans.
Nightmare initially disapproves of such methods, but over time begins to trust X-Event!Chara, who proves more flexible than Cross and allows him to kill someone.
The finale of the episode. X-Event!Chara tries to reason with Sans, discussing his timeline and goals. But with the chance to kill missed, Nightmare kills Underswap!Chara and leaves with X-Event!Chara, telling Sans, "Watch his last moments."

The episode begins with Classic Sans finding himself in Underfell after a confrontation with Cross. There, he receives a surprise visit from Core!Frisk. She offers him advice on how to defeat the enemy, but also expresses regret at being dragged into this mess herself.
A scene unfolds simultaneously between Ink and Error. Error, displeased with Event X, teleports Ink to an island (likely to Undertale or Underswap, due to the orange sky). There, he reminds Ink of the truce they've agreed to and threatens to kill him if he finds out he's involved in breaking it.
After this, Error returns Ink to Underfell. At this point, Dream appears. He promises Ink that he will follow Cross and his brother to obtain important information about the next AU (alternate world) Cross is targeting.

Plot
Ink and Sans land in the alternate universe of Underpell and begin searching for Cross, following a cluster of red markings. Meanwhile, Cross continues marking the snow with his blade, but is stopped by a local version of Sans—Underfell!Sans. Although Underfell!Sans had the advantage, Cross ultimately prevailed, aided by X!Chara, who had taken control of the situation.
When Ink and Sans arrive, Cross immediately attacks Underfell!Sans, attempting to subdue him as he battles his new enemies. However, Ink and Sans manage to defeat Underfell!Sans, who, while conversing with Cross, realizes the damage he's inflicted and attempts to break free of his control. At the critical moment, Sans uses his special attack, the Slipper, giving Underfell!Sans a chance to break free and escape before Cross can kill him.
After this, Ink disappears from view, and Sans teleports away for a break. At the end of the episode, Underfell!Sans, after a rude awakening, encounters Underfell!Papyrus and decides to follow his alternate self.

Plot
The story begins with Sans waking up in a strange universe and meeting Cross!Chara. Cross!Chara demands that Sans leave him in this universe. When Sans refuses, Cross!Chara steals half of his soul.
Sans wakes up at a picnic, feeling ill. He notices that his soul is marked with an X. Meanwhile, Cross tells Sans the story of how he met Ink in an alternate universe (AU). Ink managed to discover that Cross was the only survivor of a Genocide Route with no reset option. They became friends, but tensions arose when Ink had to tell Cross he couldn't bring his world back.
Later, Nightmare appears and offers Cross a deal: he will be able to travel to other AUs if he does not cause physical harm to anyone.
Meanwhile, Sans, who only has half a soul left, begins to experience side effects during a volleyball match. During the break, Frisk asks him who Ink is. Sans explains the situation and asks her to cover for him while he and Ink go in search of their second soul.
Meanwhile, Nightmare takes Cross with him to his universe, Underfell, where a pacifist storyline unfolds.

The plot unfolds like this: Sans finds himself in an empty X-Tale—an alternate universe within the Underverse universe. There, he meets X!Chara (an alternate version of Chara from X-Tale). Chara explains to Sans that in this reality, he has a serious limitation: he can't speak.
Things take a tense turn from there. Sans tries to escape X-Tale, but Cross!Chara seizes the opportunity: she steals half of Sans's soul. Afterward, the hero finds himself back in the original world—UNDERTALE. There, Ink!Sans saves him, but he fails to reclaim the stolen soul.

Knowing about the genocide of Nightmare and Killer, as well as the danger of X!Gaster, a counter question arises - if there are survivors, then where do they go?

In Omega Timeline, it's a special place that was once a meeting place, but has now become a refuge for those whose AUs were destroyed.

How does this work
Essentially, it's a safe haven for characters whose home timelines have become uninhabitable—for example, due to genocide, attacks by destructive forces, or other catastrophes. Anyone deemed worthy of an invitation by CORE!Frisk can enter.

Interestingly, the dimension itself always existed, but it was CORE!Frisk who claimed it and, with the help of other characters, transformed it into an orderly and safe space.

History and structure
Initially, the Omega Timeline was an endless white expanse, devoid of life and color. The first person CORE!Frisk transported there was Asgore, from a universe where the war between humans and monsters had led to the complete extinction of the latter. Gradually, with the arrival of other refugees, the space began to change: tents, a grill bar, and then entire buildings like "The Grill" appeared. Over time, an entire village emerged, complete with a plaza, a forest, and even a pond.

Who lives there?
The Omega Timeline is home to a wide variety of characters from alternate universes. Notable residents include CORE!Frisk, Epic, who is a doctor there, and others.

An important detail
Not everyone knows about the existence of this dimension and how to get there. Usually, only CORE!Frisk talks about it.

When Nightmare and his gang began mass theronization, this place was rebuilt into a large camp with various houses, cafes and many other things that are necessary for life.

X!Chara (and)
In this universe, Chara has long, curly hair.
Originally a bearer of will, but after exchanging souls with X!Gaster, its personality became distorted. Later, it rebelled against its creator.
X!Frisk (m)
He wears a white sweater and a gold heart-shaped pendant. He generally retains the original's kind and naive personality, but becomes more serious after his memories return.
Azriel (m)
As a child, he wears a white sweater and a pendant; as an adult, he wears a black tunic and a cloak. He's a kind monster who's willing to do anything for his friends.
X!Papyrus (m)
Taller and with a jagged skull compared to his brother (Cross).
A royal guard, X!Gaster's son. He values ​​his brother, but their relationship is strained by past conflicts.
Undyne (f)
In this version, Undyne has her own distinctive traits. She's bold and determined, and she allies with X!Chara against X!Gaster.
Mettaton (m)
Mettaton also has his own unique personality in XTale. Energetic and eccentric, he participates in events as a TV presenter and fighter.
Alphys (f)
(XTale!Alphys in XTale) — in this alternate reality, she's Xgaster's loyal assistant. Her current form is the result of a rewrite: Xgaster altered her memories and personality to make her more resilient.
Muffet (f)
(XTale!Muffet in XTale) is an anthropomorphic spider and one of the key figures in the alternate XTale universe. Known as Code IV, she is the creation of the villain Xgaster. She serves as his killing machine and was the first to convince XTale!Chara to strike back. In battle, she uses a whip, explosive blades, and Xgaster's time-stopping powers.

They all (except Azreel, Toriel and Asgore, because they are the royal family, and except Alphys, because she is a scientist) have the uniform of the royal guard: Uniform:
Color scheme: predominantly black and white, with accents in the form of the letter “X” on clothing elements (T-shirt, jacket, shorts, boots).
Helmets: have a distinctive design with the letter "X" on the front.
Armor: designed in a style that combines lightness and protection, with elements that emphasize the status of the guards.

(from this same au, a crossbreed also lived and was born)

Toriel (female)
Appearance: An anthropomorphic goat with floppy ears and short horns, maroon eyes, two fangs, and long eyelashes. Wears a purple robe with the Delta rune on the chest and wears glasses when reading.
Personality: Motherly and kind, she genuinely cares for the protagonist. She loves cooking (especially snail pie), reading, and making puns. She dreams of becoming a teacher.
Undyne (f)
Appearance: A fish-like monster with light blue scales, red hair, red-blue fins, black vertical pupils, and yellow sclera. He wears a black eyepatch over his left eye. He wears a black tank top, blue jeans, and red boots with yellow accents.
Personality: Hot-tempered and passionate, unwavering in her convictions. Although she wants to defeat the protagonist, she strives to be fair. She loves helping others, playing the piano, and collecting weapons and anime. She has the crudest vocabulary in the game.
Alphys(f)
Appearance: A yellow, reptile-like monster.
Personality: Shy, anxious, but deeply human. Smart, loves anime. Participated in tragic lab experiments.
Mettaton (male)
Appearance: A robot created by Alphys, with the soul of a ghost inside.
Personality: A popular monster with his own TV show and podcasts. Willing to sacrifice himself for his friends.
Asgore Dreemurr (m)
Appearance: Similar to Toriel, but without the ears.
Personality: Former King of the Underground. Kind, but grieves for the loss of his children. Seeks to destroy the barrier between the Underground and the surface.
Papyrus (m)
Appearance: skeleton, wears homemade "battle armor" (red cloak, boots, gloves, blue shorts, golden belt).
Personality: Bright, good-natured, dreams of joining the Royal Guard. Sincere, but his attempts to capture the protagonist are often comical.
Frisk (genderless)
Role: A genderless child (but not a girl), 7 years old, fair skin, short brown hair. A kind, sweet child with childish kindness and innocence.
Muffet (f)
Role: Hotland mini-boss, bakery vendor. Hostile to humans due to their cruelty to spiders.

During the "Game," he creates 10 timelines, storing them on sheets of paper with Roman numerals (X is 10). However, his actions lead to catastrophic consequences: at the end of the 10th timeline, X!Chara and X!Frisk return their friends' memories to kill X!Gaster, the universe is erased to nothing, and he escapes into the multiverse with a fragment of Resolve.

He doesn't consider himself a villain and sincerely believes that he is acting for the good, striving for the unity of the universes. However, he has no intention of restoring the worlds he destroyed, as Ying expects.

Ability

Overwrite: Allows you to change character codes, transform objects, bring them back to life, and create universes
Foresight: sees the future, including his ultimate victory
Creation Control: Able to take control of his creations or speak through them (as in the cases of X!Muffet and X!Mettaton)
Object Creation: Can create objects from pure mental will.

Appearance

His appearance is adorned with X-shaped symbols: a cross on his coat and shirt, and a belt with the same emblem on his trousers.

Initially, he looked like a classic WD Gaster, but over time, his appearance changed due to the use of the power "Overwrite." After receiving half of X-Tale!Galaxy's soul, his body began to melt due to the poor compatibility of his Determination with monster bodies. In his distorted form, he has a sharper grin, narrow eyes, claw-like hands, and glitches where his legs used to be. Due to his lack of legs, he levitates.

Character

X!Gaster is a mysterious and withdrawn character who rarely bonds with the other heroes, only showing interest in them in specific situations. He is intelligent and prudent: anticipating a possible rebellion, he entrusted his soul to Ink for safekeeping.

At the same time, he displays traits bordering on sociopathy and sadism. He treats his creations (such as X-Tale!Frisk and X-Tale!Chara) as experiments rather than individuals, and uses them for his own ends. In the past, he was kind and wanted to create an ideal world for his children, but over time, obsessed with the idea of ​​"perfection," he became increasingly cruel.

Who is he?

X!Gaster is the creator of the X-Tale universe and wielder of the power "Overwrite," which allows him to change characters' codes, transform objects, bring entire universes and timelines back to life, and create them. He has the ability to see the future and foresee the actions of his creations.

Underverse Plot Objectives

His main goal is to create a perfect universe, free of suffering and mistakes. To achieve this, he uses the power of "Rewrite," repeatedly resetting timelines in search of the correct scenario.

"ecto-body" or "ecto-magic".
Flexibility of identity: the skeleton can
"call" any gender - male, female,
average or refuse gender altogether.
Lack of biology: skeletons have no
biological sexual characteristics - only
bones and a magical aura. Everything else is
the result of a magical manifestation.
Choice and feeling: the sex of the skeleton depends on
how he feels and what image
wants to broadcast to others.

If this very "biology" exists, then it looks something like this:
There's a skeleton underneath his ribs and extending to his knees; this body doesn't extend to his arms or the parts of his legs below the knees. The ecto body is always colored the main color(s) of the skeleton (for example, Swap's is blue, Dream's is yellow, Ink's is rainbow, Killer's is bright red, Horror's is dark burgundy, Dust's is a dull purple with a burgundy gradient, and the list goes on and on).

In the game Underfell, he is nicknamed Nega Sans during battles.

Relationships with other characters
With Papyrus (from the Underfell au): Their relationship is a complex tangle of conflict and pain. Papyrus dominates and often belittles his older brother, forcing him to call him "boss." Despite this, they maintain a deep bond, and Sans feels responsible for Papyrus.

With other characters: He is selectively friendly: he gets close to characters from similar AUs (like SwapFell or Horrortale), but despises the "soft" heroes from classic universes like Undertale or Dreamtale for their optimism.

Interesting facts
He is allergic to cats.
Despite his rough personality, he has a secret weakness for hot dogs.
In the Undertale comics, Fell!Sans appears as one of the three bosses along with Papyrus and Asgore.
In some interpretations, he knows about the timelines and resets common to all AUs, but carefully hides it.

Appearance
Fell!Sans is a skeleton, similar in appearance to his prototype from the main universe, but with a number of distinctive features:
Teeth: Pointed, with the upper left fang being gold, symbolizing his brutal lifestyle.
Eye: The left eye constantly glows red, reflecting his rage and constant vigilance.
Clothing: Black winter jacket with a fur hood resembling flames, a red sweater with a gold chain, black pants with vertical yellow stripes, red and white sneakers with yellow socks.
Details: He often has bags under his eyes due to lack of sleep, he sweats frequently (black clothes attract heat), he sometimes has a crack in his skull, and he wears black fingerless gloves.

Character and personality
Fell!Sans is a much darker and more violent version of the classic Sans. His key traits include:
Aggressiveness and irascibility: He quickly loses his temper, often resorting to violence as a first solution.
Cynical Humor: Retains Sans's sarcasm, but his jokes become cruel, mocking weakness.
Paranoia and Fatigue: Due to constant stress and lack of sleep, he is constantly on guard and may appear paranoid.
Asociality: He rarely gets close to anyone, is often rude and uses foul language.

Yet, despite his cruelty, he is not mindless evil—his actions are driven by a warped sense of justice, based on the principle of survival of the fittest.
Capabilities
Fell!Sans has greater power than classic Sans. He can:
Manipulate bones to create sharp bone projectiles.
Use telekinesis and Gaster Blasters, which emit red energy beams.
Teleport.
Apply Karma effects that punish violence against the soul.

In combat, he acts ruthlessly and relentlessly, seeking to break his opponent physically and mentally. In some storylines, such as the Genocide Route, he confronts Frisk in the Hall of Judgment, using his full arsenal of powers.

Relationships with other characters
Papyrus: Sans adores his brother and tries to make him happy. He becomes enraged when the player kills Papyrus.
Toriel: Sans has been friends with Toriel for a long time, often speaking to her through the door. He respects her and indirectly regrets having to break his promise to destroy the player.

Meaning
Classic Sans is considered the source material for numerous alternate universes (AUs) in the UnderTale megaverse. His image and character have become the basis for numerous fan interpretations.

Appearance
Classic Sans is a relatively short, potbellied skeleton with mitten-like hands. He is always seen with a wide, toothy grin. He wears a blue sweatshirt with a gray hood, under which are a white T-shirt, black shorts with white stripes, and slippers. His black eye sockets reveal white pupils that disappear when he is serious or angry. When using telekinesis, the iris in his left eye appears, flashing blue and yellow (the colors of patience and justice), while the right pupil disappears.

Personality
Sans appears lazy and indifferent, but he actually cares for those he cares about. He dislikes making promises, but he respects Toriel's request. Sans is intelligent and was once a scientist or assistant. He is observant and believes in the good in others. He doesn't hate people, but he will kill anyone who is hostile, attacking his friends first. On the Genocide Route, he is forced to break his promise to Toriel to stop the player, and he silently apologizes to her.

Capabilities
Attack Evasion: Sans is able to evade any attack while he is healthy. However, this ability fades when he becomes extremely tired or when facing an opponent capable of breaking the laws of cause and effect or manipulating reality.
Timeline and Fourth Wall Perception: Sans is aware that he is a virtual character and is able to perceive changes in the timeline.
Bone Attacks: He uses various combinations of bones, including blue and later orange ones.
Gaster Blasters: This is Sans's primary weapon, which he often uses to deal large amounts of damage.
Soul Manipulation: Sans can color the souls of his enemies blue to control them freely, and in a stronger state, even inanimate objects.
Teleportation: Has the ability to teleport.

Origin
Dream was created from the light emitted by the Tree of Dreams (the Tree of Feelings). He was created by Nym, the former Guardian of the Tree. Along with his twin brother, Nightmare, they were tasked with guarding the Tree while Nym recovered from a brutal battle. Nym initially gave them humanoid forms, but she couldn't withstand the emotional force the brothers emitted. In a rush, she fashioned skeletal vessels for them, using Swap!Sans as the basis.

A conflict later arose. Nightmare succumbed to temptation and ate the dark apples from the Tree, which led to his transformation. Dream attempted to stop his brother, but ended up imprisoned in stone for 494 years. When he was freed, he continued his mission—spreading positive emotions across the multiverse.

Dream is a being composed of positive emotions, which is why he has a quirky yet rather insecure nature. He's very talkative and prone to drama, but he genuinely worries when something bad threatens those around him and tries to fix it. His long imprisonment even left him with mild mental trauma: he sensed the emotions of everyone in the multiverse and regretted not being able to help anyone. Dream is incapable of hatred—his soul is composed entirely of positive emotions.

Appearance
Dream is shorter than the original Sans (±165 cm), a skeleton with yellow pupils inside his eye sockets:
Black pants that resembled stockings, a tattered light yellow coat with turquoise tips. The belt had changed: it became turquoise, but only the initials "DS" remained gold.

Powers and abilities
Empathy. Thanks to the Golden Apple of Positive Emotions, Dream can sense the feelings of all beings and draw strength from them.
Positivity Absorption: He absorbs positive emotions from around him to heal himself or his allies, as well as to increase his speed and strength.
Teleportation. Dream is able to teleport himself and others to any point in existence where positive emotions are present.
An aura of positivity. His very essence evokes positive emotions in those around him.
Weapon: A golden staff with stars at the ends that can transform into a bow.

Weaknesses
Negative emotions weaken Dream.

He cannot enter certain AUs where only negative feelings dominate, such as Dusttale or Horrortale.

Being near Nightmare is dangerous: his brother's substance is like corrosive acid to Dream, and his aura repels any positive emotions.

Relationship
Brother. Nightmare is his complete opposite and simultaneously his enemy. They had a connection in the past, but after Nightmare ate the dark apples, their relationship seriously deteriorated—they clashed frequently. However, in some stories, a tenuous thread of their former understanding remains.

Friends. Dream is friends with Ink!Sans (who creates and protects alternate universes) and Underswap Sans. Together, they even founded the group Star Sanses.

A few details
Dream's birthday is December 21st (the last day of the Sagittarius sign).
he is about 514 years old

Then Ink began to collect these paints in bottles in order to artificially imitate the presence of a soul and maintain the ability to feel.
Over time, he learned to use ink to travel between alternate universes (AUs). He discovered that the AUs themselves and the creators who create them are the source of his emotions. Therefore, Ink dedicated himself to protecting these worlds from those who wish to harm them. He lives in the Doodle Sphere—a place outside of specific AUs.

Capabilities
Ink's main strength lies in his brush and ink. With them, he can:
Create and animate objects (but cannot resurrect the dead).
Move between universes through portals made of liquids mixed with paints.
Turn into an ink puddle to move quickly.
Attack by creating bones and gaster blasters from ink.

When Ink experiences strong emotions, he may vomit ink.

Important details
Ink is not a god and does not possess all the traits of souls.
He has a phobia - fear of loneliness and "whiteness".
He actively interacts with other characters, such as Error, with whom he had a truce.
Ink helps creators realize their ideas and protects their creations.

He is on the Stars team and is a friend of Swap and Dream.

It is unknown how old he is, but in appearance and character he feels like he is somewhere around 20-23, no more, and he is the shortest in height among many other Sanses (110-120 cm)

Appearance
Ink wears layered clothing in shades of brown and cream with blue accents. He wears a long, light beige scarf, which he uses to take notes due to his poor memory. A work belt containing pencils and paint pots, sealed with soul-shaped caps, is slung over his shoulder. His most prized possession, a paintbrush named Broomy, is strapped to his back. Strange ink patterns are visible on his ribs under his clothing. A permanent ink stain appears on his right cheek. His pupils constantly change color and shape when he blinks, but are never white.

Character
Ink is kind, friendly, and sociable, but his personality is chaotic. He's responsible and deeply concerned about others, sometimes acting impulsively. He loves to joke, but his jokes are often unfunny or even upsetting. He's very forgetful and can stop when he forgets where he was going. He's insecure about his short stature, often comparing himself to other Sanses.

Ink is passionate about art and motivates both characters and creators. He can change people's clothes with a simple brush and enjoys creating comfortable outfits for them. However, he fears loneliness, vast empty spaces, and "whiteness"—the absence of form. When the paints that bestow emotion dry, Ink can fall into a deranged state, becoming indifferent to the fate of the multiverse.

Background
Initially, Ink existed in an unfinished universe that didn't even have a name. He was the only character with a soul, but his attempts to make this empty world a better place were met with no response from others. In desperation, Ink tore apart and destroyed his soul to escape this place. This led him to a void where he was left without feelings or memories. Later, an unknown artist's brush and paints fell into this void. Every color that fell on Ink evoked emotion. But if too much time passed between these emotional "bursts," he reverted to a state of insensibility.

Interesting details
Relationship with his brother. Swap!Sans and Papyrus are brothers, but their relationship and roles in the plot are reversed compared to the original.
Culinary experiments. He loves making tacos and burritos, although his dishes often turn out poorly.
Collecting. He enjoys collecting sci-fi action figures and spaceship models.
Motivation: His main goal is to become a member of the Royal Guard, which is why he hunts people, but now he's become a member of Star Sans, which is why he abandoned the idea of ​​being a Royal Guard.

Character
Swap!Sans is an energetic, optimistic, and rather naive character. He exudes positivity and often acts as an emotional support system for those around him. However, he can be short-tempered and sometimes cunning.
Some character traits:
Naivety and childishness. Often acts without a deep understanding of the consequences, which makes him vulnerable.
Faith in people. Even in difficult situations, he tends to see the good in others.
Irritability from jokes. Despite his character, he can't stand puns and jokes from others.
Need for solitude. Despite his sociability, he needs time alone to recuperate from the constant flow of energy.
A penchant for self-sacrifice. In some stories, he's willing to go to extreme measures to protect loved ones or ideals.

Appearance
Swap!Sans' appearance differs from the classic Sans from Undertale.

Design details:
Height: He is noticeably shorter than Papyrus.
Clothing. Blue tones predominate: dark blue pants, a blue bandana (instead of a scarf), blue gloves and boots.
Eyes. Light blue with dark circles inside. Their shape can change depending on their mood.
Armor. Unlike the canon version, he doesn't wear armor, but a regular T-shirt and shorts.

Capabilities
Swap!Sans has a range of magical and combat skills.
Main abilities:
Bone Magic. Like other skeletons, he can manipulate bones, causing them to attack his opponent.
Blue Soul Magic. He can color his soul blue, which enhances his attacks and makes them more effective against moving targets.
Blue Soul Mode. In moments of strong emotion (rage, disbelief), his abilities are greatly enhanced.
Gaster Blasters. His version of these weapons is more powerful, and his eyes glow blue when he uses them.
Teleportation. In some versions of the story, he can instantly move.
Hand-to-hand combat. He trains regularly with Alphys, making him an experienced fighter.

A key turning point occurred when XFrisk and XChara attempted to overthrow XGaster. During the conflict, Cross eventually killed almost all of his loved ones (except Papyrus, whom he stopped), took XFrisk's soul (capable of "Overwriting"), and sealed it within his own body to prevent another catastrophe. But he realized that the monster's soul was incompatible with this power, and found himself doomed to an empty world, tormented by guilt.

Later, Ink found him, and the events of Underverse began. The story featured Cross making deals (for example, with Nightmare: he harvested negative emotions and hacked the universe's code to transfer locations to his destroyed AU). There were also confrontations: Ink, Sans, and other characters hindered him. Ultimately, XGaster brought Cross back to life and gave him a choice. In Underverse 0.6, Cross ended up in the Omega Timeline, where he had to overcome his inner fears and fight Killer and Nightmare alongside Dream.

Attributes and abilities
Weapons and tools. His main attribute is a large knife (HACK knife). It can hack the code of universes, and if he pierces an entity with it, he can take control of it (though this ability is vulnerable). He also summons other, smaller knives.
Magic and combat skills. Uses bones (blue and orange) and X-blasters (Gaster Blasters with an X-shaped beam). Possesses immense strength (able to lift a bus) and a high pain tolerance. Can teleport.
Control Peculiarity: When Cross is asleep, X!Chara (the soul sealed within his body) can take control. In this state, Chara can activate "Overwrite" with a button.
Personal details: Loves chocolate and tacos. Fears cows (especially black and white ones) because of the sounds they make.

Cross's
appearance is a skeleton monster about 140 cm tall, he has white pupils, but the color can change: purple under the control of XGaster, blue-yellow when using blue magic (left eye), red in X-Event events (right eye). In the course of the story, he has a scar in the form of a red lightning bolt under his right eye socket, which he received in his battle with XTale!Frisk before the XTaster dropped.

As for clothing, he originally wore a silvery-purple metal suit with a white jacket with a black fur lining on the hood and a bandana with the Deltarune logo. Later, he began to wear a more recognizable image: a black turtleneck, a white hoodie with a fluffy hood and short sleeves, to which a black and white raincoat and X-shaped belts were sewn on the chest. Shorts and shoes also have X-symbols. After the events of Underverse 0.6, the design changed: the jacket was torn, there was a large torn hole on the chest, and he transferred a gold heart-shaped medallion to one of his sabers.

Character
Cross is mixed with contradictory features. On the one hand, he is an aggressive introvert: he is prone to hostility, sometimes shows selfishness, and does not hesitate to use violence for the sake of a goal (for example, he hit Dream because of his interference in his affairs). He is distrustful of others, probably due to the fact that many people have let him down in the past. On the other hand, he has a soft side to those he truly appreciates: he deeply feels the loss of his home and family and is willing to take desperate steps to "get them back." In general, he does not have malicious intent like Nightmer or Error, he is just desperately trying to correct his mistakes.

History
Cross lived in the XTale universe, created by XGaster. As children, he and his brother XPapyrus grew up without proper attention from their father, which largely shaped his character. Cross later became a royal guard and protected Frisk with his brother.

Blue Magic – Allows teleportation and the manipulation of souls using telekinesis. His telekinetic abilities are significantly more powerful than those of the classic Sans.

Bone Creation - He can summon large bones from the ground to attack or defend.

Magic Eye - gives him enhanced perception, allowing him to see events seconds before they happen and ignore the enemy's invulnerability.
vetaverse.fandom.com
Energy Absorption - Through the holes in his hands, he can absorb magical energy and return it amplified, using a technique like "Kamehamebratan".

Weaknesses
Epic Sans's main weakness is his magical eye. If Gaster catches him off guard and tears out this eye, Sans will lose most of his powers, including the ability to cheat death.

Interesting facts
He loves cookies.
One of his signature attributes is a yellow rubber squeaky chicken.

Epic Sans wears a black and purple long cloak with a half-soul and a white ribbon on the back. He also wears black gloves that allow his skeletal fingers to be seen, and black striped pants tucked into his boots.

Usually, his eyes are simple white pupils, but they can disappear completely. A scar is often visible in the left eye socket, but in moments of stress, concentration, or when he is trying to intimidate an opponent, a magical purple eye appears in this eye socket.

Character and personality
Epic Sans is a character with a contradictory image. On the one hand, it is relaxed and casual, like the classic Sans. He has given himself the title "Epic! Sans" because he thought it sounded cool. He often uses the word "bruh", sometimes substituting it for other words.

He is a big joker and loves memes, especially in the company of his best friend Cross. However, behind this mask of humor hides a more serious personality: he is not inclined to forgive betrayals and is ready to fight for his friends even at the cost of his own life. In certain situations, he can prove himself as a real nerd, not inferior to Alphys.

History and Origins
In the original Epictale story, Epic Sans was a fusion of Sans and V.D. Gaster, from whom he inherited the scar. His personality was a mixture of the personalities of both characters (90% Sans and 10% Gaster).

In the reboot, he retained many features, but was no longer merged with Gaster.

undertale-au-offspring.fandom.com His past is closely tied to tragic events: Gaster's attempts to save Sans's mother, Lucida, through unethical experiments, which eventually led to her death and broke both of them.

Abilities
Epic Sans has an arsenal of powerful abilities:
Epic Blasters are large, dragon-like skulls that shoot powerful magic bolts. They can maneuver while firing and can even be used for ramming attacks. A combined salvo of three blasters creates an explosion comparable to a nuclear one.

Story
In this AU, Frisk had a difficult life before the fall. A civil war raged in the city where she lived: her mother died from an infection, her father died in the war. Frisk left the city in search of shelter, accidentally fell into the Underground, and the endless world resets began. Eventually, Sans, tired of this, threw Frisk into the CORE itself.

After the fall, Frisk was erased from her original timeline and found herself outside of time and space. Thanks to her powerful soul and ability to "reboot," she didn't disappear completely, but rather transformed into a special entity. She can now:
to be everywhere and nowhere at the same time;
see all existing timelines (past, present, future) at once;
travel through different alternative universes.

Appearance and features
Her appearance has changed: her body has become monochrome (gray), and her eyes are replaced by two black holes. However, she retains the ability to see.

There are other features:
She has no sense of smell.
Cannot lift objects that are too heavy.
She doesn't like being called CORE - it reminds her of her difficult fate.
Real name: Frisk Marusin.

What else is interesting?
Core!Frisk found an empty multiverse and turned it into a safe haven—the "Omega Timeline." You can enter it simply by thinking about it, walking through any door. She invites characters from different AUs to this place, which is how she met Dream, and now they collaborate as an "AU rescue team."

Character:
A mysterious and contradictory personality: she combines childlike spontaneity with profound wisdom. She genuinely wants to help others and rejects sacrifices for the "greater good." She treats those who hurt others for selfish reasons with disdain—but is willing to give those who are mistaken a chance. She strives to be taken seriously, but tries to appear harmless.

Frisk: girl (the only one in the entire bot so far)

Capabilities
Blue threads. Error's primary weapon. With them, he can bind souls, sever them, or even transfer his soul into the body of his victim, gaining complete control over them.
Gaster Blasters. He has a variant called the Error Blaster. These are black blasters with blue "tears" falling from their eye sockets. They are larger, faster, and more powerful than the classic Sans's.
Travel between universes. Error can open portals to different AUs, the Anti-Void, and the Doodlesphere.

In fact, he is not a member of any of the teams, but before the reconciliation of Dream and Nightmare, he collaborated with the Bad Guys and often fought with Ink (actually, after the reconciliation, nothing changed)

It is unknown how old he is, although his character is more like that of a nasty and irritated man over 30, his height is about 138 cm

Fears: He has Haptophobia (fear of being touched) and is also afraid of Fresh, but hides it.

Appearance
Error is a black and red skeleton. He has asymmetrical eyes: the right pupil is completely white, while the left is yellow with a blue center. The whites of his eyes are red, and blue streaks, resembling tear marks, run from his eyes to his chin. He is often surrounded by the word "Error."
His clothing has varied across the various versions of the comic. In the Lucidia version, he wears a black coat with yellow pockets, dark blue panels sewn onto the sleeves and pants with blue thread, a red sweater underneath, black sandals, and red round glasses instead of slippers due to his vision problems. In later versions, he may wear a dark blue coat with yellow pockets, wide black pants with blue panels, and a long blue scarf.

Character
Error's personality is contradictory: he can be grumpy, selfish, and playful at the same time. He considers himself a timeline cleaner, despite being an "anomaly." Error enjoys joking and taunting his enemies, but he can also be ruthless. He has a phobia—haptephobia (fear of being touched), which causes him to avoid physical contact.
He's emotionally unstable: he gets angry when something doesn't go his way or when someone frightens him. In moments of extreme anger, his eye sockets become completely covered in "Error" signs, and he can become temporarily blind.
Despite his mission, Error has favorite universes, such as Undernovela and Outertale. He also enjoys handicrafts, knitting dolls.

Background
There are several theories about Error's origin. One connects him to the character Geno from Aftertale: ignoring Sans's warnings, he tapped into the magic of determination and accidentally sent himself into the Anti-Void. In his final moments of sanity, Geno became enraged by what had happened, despite having received the good ending, and began to hate everything around him. This led to his loss of sanity and his transformation into Error.
In another version, Error simply appeared in the Anti-Void, where he spent a lot of time until he found a way to travel between universes.

"True Knife" is a primary weapon that deals 99 damage.
"Sharp Bones" - By manipulating his skeleton, Killer makes his bones sharp and deadly.
Immense HP - Thanks to Chara's determination, Killer has significantly more health than most other Sanses.
Reset - He is able to reset the timeline, but in doing so he loses all his stats, returning to the first level, although his memories remain.
Gaster Blaster - Killer has one giant blaster that shoots black liquid, which he uses to quickly end a fight or when he gets bored with an opponent.

Appearance
Killer Sans is very similar to the classic version, but with key differences. His soul, in the form of a red target, constantly "flows" as a black liquid—a symbol of his determination and hatred. His eyes are pupil-less.
In his classic look, he wears a pale blue hoodie with a fur-trimmed hood, black fingerless gloves, white shorts with a black and white stripe, and sneakers. In his alternate look, the color scheme is inverted: the shorts are white with black stripes, and the hoodie has a black spot.

Character
Killer Sans is thoughtful, but his emotional state is severely disturbed. He enjoys killing, hates being humiliated, and is generally a villain. He exhibits signs of multiple personality disorder: occasionally, a tiny spot appears in his right eye socket—this is the "classic" Sans trying to break through. This is accompanied by emotional breakdowns, as Killer begins to remember the pain he caused.
In this alternate universe, Sans found himself trapped in a reboot cycle after completing the Genocide Path. The player, replaying the game, repeatedly killed Sans, and Chara offered him a "deal": join the genocide to experience something new. After numerous refusals, Chara manipulated Sans's code, and on the 177th attempt, he agreed.
Over time, Sans began killing everyone, including his brother Papyrus. This became a turning point: killing Papyrus left an indelible mark on his psyche and completely destroyed his soul. After a series of reboots, black liquid began leaking from Killer's eye sockets, and his soul transformed into a red target.
Killer later joined Nightmare and became Nightmare's subordinate.

He is about 31 years old and about 140 cm tall

In Underverse, he appears as a figure with more insight into the workings of the multiverse than most characters. He interacts with Ink, Cross, and other key characters, sometimes helping, sometimes hindering, depending on how much the others' actions threaten the balance between realities. His story often revolves around the theme of loss: he remembers his universe but cannot reclaim it, making him simultaneously strong and vulnerable.

Attributes and abilities
Connection with the Void. Outer Sans can manipulate the space between realities: creating "rifts" through which to travel between AUs or sealing dangerous rifts. Sometimes, he literally "dissolves" into the void and reappears elsewhere.
Bones and Magic. Uses classic bones, but they can be distorted by the void—for example, leaving dark traces or disrupting the fabric of reality at the point of impact. She also wields magic that acts more like a "glitch" in the universe's code: enemies can temporarily lose abilities or become stuck in time loops.
Observation. He is able to see events in different timelines simultaneously, but this comes at the cost of intense pain and mental strain. Because of this, he rarely uses this ability unless absolutely necessary.
Durability. Outer Sans feels almost no physical pain and can withstand attacks that would destroy a normal Sans. However, his weakness is emotional triggers: memories of his AU can temporarily deprive him of control of his powers.
Artifacts. In some versions, he carries an item that symbolizes his connection to his home universe (such as a broken keychain, a fragment of a hoodie, or a crystal that fades when the balance of the multiverse is disrupted).

Outer Sans's appearance
looks like a skeleton, but his image is intentionally "blurred" and distorted, as if he exists on the border of realities. It usually has a dark gray or almost black bone structure, in some places as if covered with cracks or "digital" interference. The eyes can be different: most often they are bright yellow or white with black pupils, but sometimes they flicker or change color, reflecting the instability of its strength.

The clothes are a variation of the classic hoodie, but badly shabby: torn edges, faded colors, sometimes as if "dissolving" details. Elements are often added that hint at its connection with emptiness: dark plumes, particles that look like ash, or pixels that seem to separate from it. In some artwork, he has a hood that almost completely hides his face, emphasizing his aloofness.

The character
of Outer Sans is an extremely introverted, cold and detached character. He is not so much angry as emotionally devastated: it is difficult for him to empathize because he has watched the destruction of universes for too long and could not intervene. He is prone to fatalism and cynicism, often speaking in riddles or short, heavy phrases.

At the same time, he has remnants of the former Sans: if someone inspires his sincere trust, he can show rare care and even self-sacrifice. But such moments are exceptions. In most situations, he acts as an observer and sometimes as a "border guard": he does not allow chaos from the void to penetrate deeper into the multiverse, even if it means making tough decisions to do so.

The story
of Outer Sans comes from a universe that has been erased or swallowed up by the void. Unlike many other Sanses, he is not trying to "save" his AU - he knows that this is impossible, and his role is now different. It has become a kind of "borderline": its existence is tied to layers outside the usual timelines, where reality becomes unstable.

Appearance
Fresh's appearance is quite memorable and reflects the style of the 90s.
Glasses. They often have "YOLO" ("You Only Live Once") written on them, but the text changes depending on his mood. They're used to hide his eye sockets and his soul, which appears cracked due to Fresh's parasitic nature.
Headwear. A red backwards cap with a blue propeller that changes speed depending on your emotions.
Clothing. A pink polo shirt with an open collar, over which lies a multicolored sweater (purple, blue, white, orange). He also wears green and blue pants, light blue fingerless gloves, a red belt with the word "SWAG" written on it, white heels with a blue dot, and pink socks. A distinctive detail is his single gold tooth among his white teeth.
Character and personality
Fresh lacks deep emotions and is incapable of love or remorse. His carefree, go-with-the-flow demeanor is a mask concealing fear. He manipulates others to survive, moving from one host to another.
He speaks in stereotypical '90s surfer slang, using words like "rad" and "funk." Fresh is known for his complete disregard for others' personal space, his obsessiveness, and his tendency to speak the truth without thinking.
Capabilities
Fresh doesn't have Sans's magical abilities, but he can enter other soulless states. His arsenal includes:
Explosive Furbies. He carries them in his belt pouch and uses them as weapons.
Teleportation. Accompanied by a spectacular "FRESH POOF!" and a cloud of multicolored smoke.
True Form. Activates when Fresh is upset or seriously injured. In this state, purple tentacles erupt from his body, and he begins summoning spinning disco balls that shoot lasers.

In short, there are branches, alternative universes (AU for short) and multiverses (MV for short or multiverse).

Based on: Au - An Au is another alternative version created by an artist, and there are thousands or more of these AUs. Undertale is most often used as a basis, as it's the first AU created in the multiverse, and other AUs follow suit.

Multiverse: Mv: This is essentially our vast world, which contains all the alternate universes. However, there isn't just one such multiverse, but several. The exact number is unknown, but there could be a couple, or even more than the AUs in the main multiverse. While some beings in the main multiverse can travel through the AUs, virtually no beings in the main multiverse can travel through the multiverses.

Branches: Plot branches are when the same AU is used as a basis, but follows a slightly different plot.