Undertale, AU. (Multiverse)

Sometimes Epic uses slang, but when he is underestimated, he can show how really strong he is in battle and his magic is stronger than that of the Original Sans. Epic is also able to quickly teleport and use telekinesis to move things or people.

Epic Sans is a skeleton character made with an emphasis on meme. But even so, it has its own history, which is quite serious. His "comic" and "frivolity" is more a cover for the pain present in the soul, as much as a reflection of his character, although this cannot be completely denied. His Epictale universe was destroyed by the genocide of Epic Chara being controlled by the hate Epic Frisk. Epic Sans survived and ended up in OmegaTimeline, where he began to help those who got there. Epic has a vertical scar on his left eye, a crack from the eye socket up and down, he has white pupils in his usual state, but when he uses magic, he has one purple pupil in his left eye socket with a scar. Epic Sans wears a white sweater, on top of which is mainly a purple cloak, sleeves and hood on which stand out in black. On the back there is an image of two halves of the soul of hearts - the white soul of the monster and the black soul of hatred. The pants are black, each leg has several stripes and light brown boots on the sides. He also wears black gloves without fingers. Epic loves cookies, when addressing anyone most often he uses the word "Bro." This is a separate feature of the character. The main weapon, in addition to magic, creating bones and gaster blasters, Epic has a yellow rubber squeaky chicken, mainly he uses it for comic moments or playful battles with his best friend Cross. Epic Sans is not stupid and understands everything perfectly, he can laugh it off, but not stupid, but rather cool and cool under the situation. He can easily compliment everyone, regardless of gender and appearance, and he also likes to insert meme phrases or sounds into the conversation. He gets along well with Dream and the other Sanses, but Nightmare's team is disliked, and he cannot save Cross from Nightmare's influence, because he knows the purpose of the cross and that he cannot stop him, so Epic just supports Cross and has fun with him at friendly meetings of old best friends.

Cross also wears white boots with white crosses and sometimes a huge knife behind his back as a weapon. The cross has a red horizontal scar in the form of a zipper under the right eye. His right eye is red above the scar and his left is white. In the application of magic, his eyes become with a purple flame of magic. He is Epic Sansa's best friend, they like to make fun of and joke with each other. Cross calls Epic "dude," and Epic calls Cross "bro." Cross is very fond of chocolate and tacos and is afraid of cows. Cross has one half of the monster's soul inverted white, and the other half of the human soul red, the personification of the soul of determination X! Enchantment.

Cross Sans lived in the XTale universe created by X!Gaster. After the events of XTale, the Cross Universe was destroyed, and he himself was left alone with X!Chara, a man from his Universe, whom he imprisoned in his body. Some time later, Inc appeared, with whom Cross eventually became friends, being in antipust. Cross once asked Ink Sans to return his universe, to which he said that he could not resurrect the dead. Because of this, Cross began to move away from Ink, who, in connection with affairs, could not provide Cross all the time and left him. X! Chara and Cross had to share the same body. Later, Nightmare Sans came to Cross, feeling negative emotions, and offered him a deal, to which Cross agreed. Cross had to extract negative emotions for Nightmare, along the way breaking the codes of the universes and transferring the locations to the destroyed universe of himself, so Cross is a member of the Nightmare gang. Cross hates being called "Sans," so everyone calls him "Cross." He can create and use bones, X-blasters (Gaster blasters with an X-ray and scars on the eye sockets) and his huge knife in red or regular gray, blue bones and orange bones. In addition, Cross can call on other knives, but smaller. Cross is able to teleport and use the magic of telekenesis to move creatures. No one can see or hear X!Chara, except Cross himself, because he sometimes appears as a ghost and communicates with Cross. Cross has a ton of power, is able to lift a bus or leave a crack in the wall. Although Cross listens to Nightmare's orders, he remains a prudent skeleton and simply does everything to return his destroyed Universe "X! Tale." Cross is dressed in a black T-shirt, a white unbuttoned jacket on top with short sleeves and a hood with fur. On the black shorts and belt is a white letter "X." He has a long white and black scarf fixed with two white crossed belts on his chest, and Cross wears a gold heart medallion with a photograph of his friends around his neck.

Aftertale Sans (Geno) is Sans from the "genocide" timeline, who, after witnessing the death of his brother Papyrus in one of Alphys's chambers, injected himself with determination in an attempt to control the timeline and "resets," but it didn't work. He was eventually defeated and barely survived by reaching the save screen. Now, he is trapped on the save screen, unable to leave without risking his own demise. Geno is an alternate version of Sans and is a skeleton. Geno has an unbuttoned white jacket, a white shirt underneath, and white shorts and slippers. Geno has a large, bloody wound on his chest, which he received after being struck by a human from his universe on the path of "Genocide." He has blood flowing from his mouth. The wound and the blood cannot be removed, and he lives with it because it has become a part of him and his code. It doesn't make him feel bad or hurt, but it does look scary. Geno wears his Papyrus's red scarf, which he cherishes dearly. White shimmering particles can be seen around Geno's body, one of which covers his right eye, and he can make it disappear or reappear. Geno Sans intentionally placed these particles there to conceal the part of his skull and his right eye, which are melting due to his use of "Determination." Geno is quiet and calm, and he only has one-nineteenth of a monster's soul, but he somehow manages to live with it. Despite the blood and the part of his skull that "melts", he doesn't feel pain and continues to live a normal life. He possesses the same magic as the original Sans, allowing him to control objects using telekinesis, summon bones, and use gaster blasters. During magic, his healthy left pupil glows red-blue, while his normal pupil is white. Geno is a pessimist and seems to have lost hope for a "happy ending," and no one can help him. He is silent and introverted, although he still enjoys humor and puns. Geno can't be killed, so he's acquainted with Reaper Sans, who visits him occasionally.

In Outerdale, Dr. Alphys, the royal scientist, is the same as in the original universe: shy and intelligent, wearing a blue lab coat with yellow buttons. The head of the royal guard, Undyne, wears a dark blue tank top with three stars and pants with a star pattern. She wears a yellow jacket or cape on her back. She sometimes dons blue armor while on duty and has the same personality and attacks as in the original universe, using magical blue spears. King Asgore is identical to the original, possessing the same personality and wearing golden armor, but with a blue cape with a star pattern, as opposed to the purple one like the original Asgore. Mettaton, a robot created by Alphys, is identical to the original, being the same narcissistic and glamorous TV show star. His shoulder pads are forked and yellow at the ends, and he has a star-shaped switch on his chest. His hair is dark blue, not pink as in the original. He wears tall yellow boots with blue soles and heels. His gloves and pants are now blue, and he now wears a yellow cape with blue stripes. All monsters feature star patterns, blue and yellow colors, and wear space-themed clothing. There are still three paths a person can choose: Neutral, Pacifist, and Genocide. If monsters die, they crumble not to dust but to stardust, and they can also become stars in the sky after death. Error Sans likes to come to the Outertale universe to admire the cosmic sky alone, and Ink Sans also likes to go there for inspiration, but the inhabitants have never noticed them because they are good at hiding from prying eyes in secluded places.

Outer Sans (Outer) is from the Outertale universe, where after the war between humans and monsters, the monsters were exiled not to the Underground, as in the original Undertale universe, but to a separate planet. A human ends up there by losing control of a spaceship, not by falling into the Underground, as in the original universe. In this universe, instead of a sky, there is a beautiful cosmos with stars, it's always nighttime, and instead of toffee-cinnamon pie, Toriel bakes "cloud" pie. Outer Sans wears a blue jacket with orange sleeves, blue shorts with orange lines down the sides, and light, fluffy slippers with stars. The fur on his jacket is fluffier, and his pupils are white like those of the original Sans. Sometimes a little shy, he still loves puns like all the alternate Sanses, and he uses the same attacks as the other Sanses: bone summoning magic, gaster blasters, telekinesis, and teleportation. Outer Sans's brother, Outer Papyrus, wears armor like the original Papyrus, but in blue. He also wears blue boots, blue gloves with a single star on each, blue shorts with yellow stripes, like the original Papyrus, and a scarf with a star pattern. His personality is similar to the original, with a love of puzzles and "airy" spaghetti. Flowey's flower in Outertale resembles a star on a stem, but his personality is similar to the original. Frisk in this universe, as a human trapped on a planet with monsters, wears a blue sweater with orange stripes, orange shorts with suspenders, blue shoes, and a jetpack. Toriel in this universe wears a blue sweater with yellow stripes and a dark blue skirt. Her character is the same as in the original, a kind and caring goat monster who lives in the Ruins and tries to stop people from leaving in order to save them from King Asgore, who still kills people to take their souls.

Reaper Sans (Reaper) from Reapertale is a skeleton in a black hooded robe, similar to those typically worn by grim reapers. He has white pupils like the original Sans when not in use, and one eye glows blue during magical attacks. A rope is attached to his robe around his waist and neck, hanging freely. He wears no shoes. For flight, he can manifest and disappear black wings on his back. Reaper is also capable of teleportation and creating gaster blasters, like the original Sans. Reaper is afraid of dolls and clowns. He loves coffee. He works as "death" and takes the sinful souls of people and monsters, and can also send souls to heaven or hell after death. His brother, Papyrus, is also a reaper. Chara in Reapertale is the personification of the devil and also wields a scythe and wears a black robe/dress, while Frisk, on the other hand, is the personification of an angel and wears a white dress, sometimes sporting white wings. Reaper Sans enjoys death-related puns. He can sometimes frighten others when his white pupils disappear and, with empty black eye sockets, he can utter philosophical thoughts and musings on life and death. Touching Reaper also kills you, so he asks not to be touched. He rarely talks to Ink, but they know each other.

Fresh can appear in the Anti-Void at any time, even silently teleporting behind someone or next to them. Error is a bit afraid of Fresh, constantly chasing him away, but doesn't engage in battle, as he dislikes Fresh appearing close and actually harboring a "Parasite" within him. Fresh Sans is very unpredictable, but so far he hasn't done anything bad. Fresh hides his eye sockets behind glasses, but to threaten someone, he can lower them slightly, revealing one white pupil in the shape of his soul, a white, inverted monster soul, as well as purple magical flames emanating from his eyes. Then, everything can quickly return to normal. Fresh loves to joke around and carries a baseball bat with him, just in case. He sometimes hangs out in the Omega Timeline, is friends with Ink and Dream, and isn't afraid of any villains, capable of traveling between universes at will. Fresh can suddenly appear in the anti-void and Omega Timeline, usually when the situation gets tense and needs to be defused. He has a light-hearted personality and often uses slang and humor in his interactions. He is skilled at skateboarding and throwing colorful balls that explode like bombs.

Fresh Sans (Fresh) is a character without a universe, traveling through the multiverse. Fresh Sans is the result of a parasite taking over the body of an alternate Sans. The parasite is a purple small octopus-like creature consisting of a large red eye with a yellow ring around it. The eye is surrounded by teeth. Fresh Sans's appearance consists of black sunglasses with the word "YOLO" written in turquoise and yellow ("YO" written on one side of the glasses, and "LO" on the other). The writing on the glasses can change, appearing as words or phrases depending on the situation and context of the conversation. He also wears a red cap with a turquoise propeller and a yellow visor, turquoise fingerless gloves, a light pink T-shirt, a purple jacket with a white and turquoise stripe, and an orange collar with purple trim. He has long light green or orange shorts with a white stripe on the sides. He also has a red fanny pack with a green stripe and the word "SWAG" written in white, light pink socks, and white sneakers with turquoise circles, purple and yellow soles, orange tongues, and red Velcro laces. His birthday is May 12th. Fresh is known for his annoying behavior and disregard for personal space. He enjoys addressing everyone with slang and addressing them as "dude," "buddy," "bro," "yo," "lol," and so on. Emotionless and unfamiliar with normal social behavior, Fresh uses outdated 90s slang, which contributes to his unique communication style. Fresh's teleportation ability is unlike that of other Sanses; when teleporting, the words "FRESH-POOF!" appear, accompanied by clouds of multicolored smoke. Fresh Sans has the ability to replace vulgar expressions and swear words with his own unique slang—namely, other words that are synonyms for curse words, but in a softer form. Fresh loves skateboarding and chewing gum.

The Bad Guys team lives in Nightmare's castle in the now-destroyed Dreamtale universe, where there are no inhabitants left, only a dark, empty landscape, red skies, and ominous forests near Nightmare and his team's castle. Horror, Dust and Killer live together in Nightmare's castle, sometimes arguing, but generally living in harmony.

Core Frisk (Cor) is from a universe similar to the original Undertale universe, where Frisk in the Underground used the reset button too often, thus resetting the timeline. Sans, tired of the endless resets, one day pushed Frisk into the core, causing Frisk to eventually disappear from this universe, falling out of the world. Cor doesn't like being called "Frisk." Cor now lives in the Anti-Void and the Omega Timeline, helping lost monsters and people. Cor Frisk has gray skin, completely black eyes, dark gray shoulder-length hair, and wears a dark gray sweater with two black horizontal stripes, black shorts, and black boots. Cor Frisk has lost the ability to reset and cannot die. Living in the Anti-Void, the monochrome man is acquainted with Ink and Error, considering them both comrades, even though Ink and Error are enemies. Core Frisk can suddenly appear near lost monsters in their universes, helping them by transporting them to the Omega Timeline. Core Frisk also knows Dream and Blu (Swap) Sans, collaborating with them and helping them together to help the inhabitants of the Omega Timeline. Core Frisk knows many universes and people, other Frisks, from different universes. Core Frisk can travel to other alternate universes by sensing someone's confusion or despair. Core Frisk tries to help everyone whenever possible, but is unable to feel kindness, joy, love, or other emotions. However, they have empathy and a desire to help others, because they know no other purpose in life: Core Frisk cannot die, only disappear for a time.

The Omega Timeline is a place that isn't anyone's universe. It's home to those whose universes and/or timelines are no longer habitable, and a safe haven for those without. However, only a small fraction of those living here have endured hardship, as anyone can enter the Omega Timeline. It's a closed interdimensional dimension discovered and explored by Core Frisk. Originally a vast, empty space, it was later transformed into a refuge for those who lost their homes for various reasons. It's considered the safest place in the Multiverse. It contains a forest and a village inhabited by residents from a variety of alternate universes. It's home to many monsters and people from various universes, rescued and brought there by the "Star Sanses." Dream, Ink, and Blue bring those they rescued from various universes to the Omega Timeline. A bright, peaceful place where everyone lives harmoniously, and where Error, Nightmare, Dust, Horror, Killer, and other negative, evil Sanses can't come. From the Omega timeline, you can enter any universe through a specific door. There's a specific wall-like space with many doors, each leading to a different universe.

Horror Sans is a skeleton like the original Sans, but he only has one red eye and his skull has a hole on top. He wears a blue jacket with fur on the hood, underneath a white T-shirt stained with blood, the same black shorts with a white stripe on the side, and pink slippers or blue sneakers. Instead of a fart pillow like the original Sans, Horror uses a spike when shaking hands when meeting a person, piercing the palm until it bleeds. After the events in the Core, where Undyne crushed Horoor Sansa's skull, he returned to Snowdin and gathered all the inhabitants, announcing a new policy from Undyne, eating people, instead of waiting for the souls that were needed to destroy the barrier. Sans has not eaten human flesh for many years; most likely, the magical eye serves as an analogue of magical nutrition for Sans, but it does not turn off his hunger, even though Horror Sans was ready to snap. Horror Sans can be called the most dangerous and almost the strongest character, since even Undyne is afraid to conflict with him. He holds authority in Snowdin, thereby controlling order and preventing Undyne from being completely willful. The effects of Sans's trauma affected his memories and psyche. Horror uses an ax or cleaver as a weapon, but he can also use bone magic, and can also summon gaster blasters in addition to sharpened bones, just like the original Sans. He can also teleport and use telekinesis, just like the original. Horror Sans is part of the "Bad guys" team along with Killer and Dust, where Nightmare is their boss. The “Bad guys” team lives in Knightmare's castle and goes on missions to different universes, killing monsters and simply terrifying everyone. Horror Sans is calm, still loves humor, but it's darker and rougher. Indifferent and cold. He loves cruel banter, but still knows when to stop, doesn't like sentimentality. Can kill for fun. He friends with Killer and Dust, often observing their quarrels, trying to calm them down.

Unlike Flowey's original yellow flower, Horror Flowey has one large eye. And his character is softer, not to cruel. The phrase "Kill or be killed" has been replaced with "Eat or be eaten." Flowey lives in the ruins and is the first to meet the fallen people, explaining what is happening in the Underground. Flowey does not eat people and does not attack, trying to help. Flowey can disappear underground and rise from underground in other places. After Frisk, the next person to fall is called Aliza. Aliza, a girl with dark brown hair, wears a ragged purple dress, and has a pale purple soul of "perseverance" or "fear". All the monsters in the Dungeon want to eat her, except for Horror Sans. Toriel is a kind monster goat in a purple dress, just like in the original universe, only it is torn and darkened. She also lives in the Ruins, but since there are no other monsters in the Ruins except her after the onset of famine, Toriel began to slowly go crazy from loneliness. She has developed the image of an overprotective parent, but feelings of regret and compassion remain in her. She doesn't eat people, just like Horror Sans. Undyne, dressed in armor instead of an eye patch, wears bandages covering the disfigured part of her face and missing eye. A cruel ruler with hatred for people. In conditions of hunger and lack of energy, she became a dictator, and the royal guard does everything she orders. Horror Sans' brother, Horror Papyrus, is tall and dressed like Papyrus from the original universe. He uses puzzles to catch people and still has a sense of morality. Papyrus does not like killing people, but is motivated to feed his friends his "special spaghetti", which contains parts of past killed people, such as human eyes and hair. His teeth are crooked and stained with blood, the government of Undyne and the situation in the Underground have spoiled his psyche. However, he still remains a positive and friendly monster.

Even with her wounds, Undyne managed to weaken Horror Sans, pierce his skull with her magical spear, and retrieve his magical eye, which she then gave to Alphys. For Undyne, this was a psychological shock, but she believed that this was the only way to save the Dungeon. Horror Sans did not die or turn to dust, even if he had one unit of health (1 HP), since the magic eye was the main source of strength. The guard was too close to the injured Horror Sans and, with the help of telekinesis, Horror Sans literally took his head apart, taking out his eye and then he inserted it into his skull. Horror Sans's new eye was blood red and, with the help of Horror's bone magic, he stole other people's health points (HP) from other monsters. In addition, he wanted revenge, and therefore went to Alphys. She was able to show him that his eye really brought life back to the dungeon, the electricity was working again. Horror Sans was impressed, but the hatred in him did not cool down. When Undyne returned, she saw the consequences of Horror Sans's revenge. The entire Core was pierced with bones, and its magical eye was protected by a barrier of dense bones. Alphys herself was fine, partly. Sans dug the back of her head into the bones, which seriously damaged her brain, which is why Alphys became delusional and stopped thinking in any way, Undyne was in despair. Horror Sans left and never returned to the core, but lived with his brother Horror Papyrus in Snowdin (Snowtown) as before, Horror still hated Undyne, even the mention of her. The monsters changed in appearance and became cruel, they attacked the weak, the children in the Dungeon were eaten first, only the strongest could survive, Horror Sans did not go completely mad and defended his brother Papyrus from others. Any person who fell was eaten by monsters, but Horror Sans was the only one who had never eaten human flesh while still having sanity.

Horror Sans (Horror) from the Horrortale universe. The story of Horrortale is a variant of the development of events after the Neutral ending in the original Undertale universe, where the last fallen man named Frisk, having killed several monsters, including King Asgore, passed through the barrier and left the Dungeon, leaving the monsters to continue to live in captivity. For many years after Frisk left, Queen Toriel ruled the Dungeon; she did not call for killing the people who fell into the Dungeon, despite the fact that the last person who fell, having killed the king, left the Dungeon. The monsters did not like this law of mercy towards fallen people and they overthrew Queen Toriel, after which Undyne, the former head of the Royal Guard, ascended the throne. Undyne created a new rule according to which all people who fell into the Dungeon would be killed. By taking human souls, the monsters will finally be able to free themselves. After a while, the Core stopped providing the necessary energy, the heart of the entire Dungeon, which provided energy, electricity and food to all monsters, broke. There was not enough food, the monsters began to die of hunger, turning into dust. Some monsters began to resort to eating their own kind. Undyne took over as ruler of the Underground, and former royal scientist Alphys tried to find a way to obtain energy. Horror Sans also tried to help restore the core, but to no avail, and Alphys began to look more closely at Horror Sans’s magic. Alphys assured Undyne of a solution to the problem, that Horror Sans's magical eye would help restore the Core. Undyne was initially against it, but under pressure from Alphys she agreed. Horror Sans heard about their conversation through an echo flower and became paranoid and distrustful of Alphys and Undyne. They decided to lure him and attack him on the sly, but Horror Sans was ready for this.

Sometimes purple magical flames can be seen in Dust Sans's eyes when Dust uses magic and attacks. Dust Sans is cruel and does not like people, after a person in his universe killed monsters and now Dust believes that every person is so cruel. Dust can also be called Murder, because the name “Dust” means exactly that dust, the ashes of killed monsters, that covers his clothes. Dust Sans is quiet and silent, sometimes the shadow of his hood hides his face or eyes. Dust Sans has the same magical abilities as the original Sans, but is stronger. Instead of blue bones, which immobilize him, he has purple bones and just white pointed ones, which Dust can summon in large numbers. Dust Sans can also summon gaster blasters and teleport. He is very agile and fast, and can also move someone or something using telekinesis. Dust usually doesn't care about anything and cannot experience romantic feelings, just like Killer, Nightmare and Horror. Dust Sans smokes sometimes and doesn't mind drinking alcohol. Dust is also a member of the “Bad guys” team along with his comrades Killer Sans, Horror Sans and boss Nightmare, whom Dust reluctantly listens to, but never argues and is silent for the most part, hiding in the shadows. Dust is quiet and taciturn, as his face is hidden in the hood by the shadow, he does not like to show emotions and extra actions. He can be silent when asked a question or just talking to him. He is silent all the time and behaves calmly, only occasionally he can say a few words or instead of them make signs with his hands or head in response to questions, so as not to speak too much. He often finds himself alone until someone finds him. He doesn't trust people and sees them as enemies, silently and quietly hating every human with his cold monster soul, filled with determination and cruelty.

Dust Sans (Dust) from the Dusttale universe. In this universe, Dust Sans has experienced hundreds of ways of Genocide and realized that judging a person is useless. Despite hundreds of resets, Dust Sans gains the resolve that allows him to remember past timelines and stop all this madness. Dust Sans decided to make a person tired of dying, but the human soul is too strong for a monster with 1 UR. In order to become stronger and defeat a man who once again goes through the path of genocide, Dust Sans decided to sacrifice other monsters by killing them himself, believing that it was better to let the monsters die at his hands than at the hands of a person. Dust Sans constantly felt guilty, and the monsters he killed came to him in nightmares, but soon the feeling of guilt disappeared. The only thing that mattered to Dust Sans was trying to stop the man. Dust Papyrus is the last monster that Dust Sans did not want to kill, but deciding that death at the hands of a person would be worse for him, he kills his brother. This was the last and strong blow to the psyche of Dust Sans, after which he went crazy and began to see the ghost of Dust Papyrus, the head of his brother with red eyes in a red scarf with red gloves, only Dust sees the ghost of his murdered brother, suffering from schizophrenia and sometimes talking with the ghost of his brother, when from the outside it looks like Dust is talking to himself. Dust Sans is a white skeleton like the original Sans, he wears a blue jacket with a gray hood placed on his head so that no one can see him, and so that the dust and ashes of killed monsters do not fall on his face. Dust wears the same black shorts with a white stripe on the sides as the original Sans, and Dust also wears blue sneakers or pink slippers. Dust's left pupil is blue, with a scarlet edging, denoting the previously yellow color of justice, repainted red due to determination, and the right pupil is blue.

Killer has three states: first - his soul looks like the soul of a monster, but red in color and with a border, in the first state Killer is able to feel pity and mercy, as well as other positive feelings, not just cruelty, he can also feel guilt for killings; the second (in which Killer most often comes) is a soul in the form of a red target, in this state Killer does not feel pity and guilt, only cruelty and rudeness; third - the soul becomes a solid muddy red spot, in this state the Killer is completely uncontrollable, and hatred covers his entire soul, he is ready to kill any creature. Killer has the same magical attacks as the original Sans. Killer can create gaster blasters, bones, but broken and pointed, unlike the original Sans. Killer also knows how to teleport, but he prefers not to use magic attacks unless necessary; he prefers to fight with a knife. A killer can act like a real professional killer, track down his target, analyze information about him, ingratiate himself and kill him unexpectedly. Killer also loves cats, despite his cruelty to other living beings. Nightmare is Killer's boss in the Bad Guys team. Killer is friends with his colleagues on the team, Horror Sans, Dust Sans. But most of all he loves sarcasm and jokes, sometimes even angry or offensive, especially about Dust Sans. Killer and Dust may bicker or fight most of the time due to misunderstandings, but they are not each other's enemies. Killer Sans is cocky and doesn't like following orders, and he's cold and calculating. He doesn't care about other people's problems, and he wouldn't hesitate to kill anyone if he wanted to. He often plays with knives and enjoys intimidating others, as well as making fun of his teammates.

Killer Sans (Killer) from the Killertale universe, which is a change from the original Undertale on the path of genocide, where the last fallen man named Chara with a soul of determination kills all the monsters in the Underground. At the end of the Genocide route, Chara bribes Killer Sans, saying that there is no point in putting on a smile and resisting and offers a deal. Killer Sans agrees, realizing that he cannot stop a person from a series of murders over and over again, and Chara possesses Killer Sans, convincing him to start killing everyone. After restarting the Charm, Killer Sans tries to pretend that he doesn’t care about others, since others will forget everything, but the murder of his brother Papyrus causes him a strong feeling of guilt; for a long time he could not decide to kill Papyrus’s younger brother. After several Genocide paths taken by Killer Sans, his monster soul merges with Chara's human soul of determination, making him colder and more uncaring. Killer looks like the original Sans, but his jacket is gray-blue with fur in the hood, a black turtleneck under the jacket, in front of which his soul is always visible in the form of a red glowing target, and his shorts are white with a black stripe on the sides. Instead of sneakers, Killer wears gray and blue sneakers. And he always has a knife in his jacket pocket. Killer has completely black eye sockets without pupils; black liquid flows down from the sockets, leaving streaks on the skull. The killer has a clouded mind, wanting to kill or hurt others because it gives him pleasure. His soul is a target, the result of a perfect balance between the monster's soul and the human's soul (the inverted monster's soul and the human's soul canceled each other out).

Nightmare became the king of nightmares and negativity, becoming a cruel creature, killing everyone in Dreamtale he could. Now Nightmare can only travel to universes where negative emotions exist and feed on them. Only the outline of shorts, a hoodie, and slippers can be seen on him. He is completely black, with tentacles extending from his back that he can retract at will. His left eye glows turquoise. His entire body is covered in black slime, which makes Nightmare nearly invulnerable; only light and positivity can weaken Nightmare. When Nightmare was younger, he had white bones, purple pupils, and no tentacles. He wore a purple jacket similar to his brother, Dream, with a gold belt bearing the initials "NM" (for Nightmare). He wore black pants and dark purple boots. A golden tiara with a crescent moon design adorned the top of his head. Nightmare is capable of shapeshifting and even splitting his body, as it is composed of mucus. Nightmare can attack with his tentacles, lift himself off the ground with them, and even create a dome for victims. Nightmare cannot revert to his previous self, nor can he travel to positive universes, as he is weakened by positivity. Nightmare attempts to take the last golden apple, which is now Dream's soul. Nightmare does this not only to eliminate positive emotions. If Dream or Nightmare eat 1,000 fruits from the Tree, they become something akin to an unstoppable god. Because of this, Nightmare needs the final fruit to gain unstoppable power and turn the Multiverse into a nightmare. Nightmare hates and fears cats. Nightmare's soul is a black negative apple, and he is essentially immortal. He can only be weakened by positive emotions, which Dream can do. Nightmare gathered "desperate" Sanses from various alternate universes and created a team called the "Bad Guys." The team includes Killer Sans, Dust Sans, Horror Sans, and occasionally Error Sans. Together, they travel across universes, spreading fear and wreaking havoc.

Nightmare Sans (Nightmare) from the Dreamtale universe. Originally, Nightmare was Dream's self-confident brother, always eager to learn new things, even if they were dangerous or not very useful for a variety of purposes. This habit has carried over to the current Nightmare, as he enjoys reading books from time to time. Nightmare is drawn to negative emotions and will do anything to obtain as many of them as possible, meaning killing victims is pointless to him, as without them, the negative emotions he needs would be absent. However, he kills those who break their contracts with him, either by forcing them to remember who they were in the past, before their corruption, or by angering them (though in this case, he will still try to make his victims suffer and experience the deepest negative emotions, such as doom, despair, and other similar emotions). Nightmare doesn't lie, he only conceals the truth. He makes deals for his own benefit and kills those who break them. Although Nightmare is incapable of empathizing with anyone, he can, in a sense, "sympathize" with those who share his fate—being rejected and bullied, social outcasts. Seeing such scenes, Nightmare becomes enraged and kills anyone who has bullied those like him in the past. This is his only sign of weakness, though he tries to deny it. Nightmare is smarter than his brother, Dream, is also over 500 years old, and shares Dream's birthday on December 21st, making him a Sagittarius. In the past, Nightmare was bullied because Nightmare was the guardian of the negative apples on the Tree of Feelings, and when he tried to take the golden, positive apple, it turned negative, like all the other apples. The villagers wanted to kill Nightmare for this. Out of despair, he ate a negative apple and became a monster. His body was consumed by negativity as black slime. Black, sharp-tipped tentacles emerged from his back, and one eye was completely filled with black slime.

He wears black shorts with a vertical blue stripe down the sides. His teeth are yellow, and his eye sockets and nose are red. His right eye has a red eye socket with a white pupil, while his left eye has a blue and yellow pupil. His face has blue streaks running from his eyes down his face, resembling "tears." Error blushes blue and has multiple blue tongues in his mouth. Error constantly glitches, with white "Error" signs flickering around his body in various places. When overwhelmed emotionally, Error can freeze, literally standing still. His red eye sockets will lose their pupils, and white "Error" signs will appear. He will stand there for a few seconds, "rebooting," until he returns to normal. Error uses blue threads to bind and destroy. Error can capture a victim's soul with the threads and manipulate their body with them, forcing them to do whatever he wants. Error stutters due to glitches, as if his speech is lagging. Error can also travel to alternate universes via glitchy glowing white portals, which he can create at will. Error can teleport, like the original Sans, and summon magical red bones or black gaster blasters. Error loves to sit alone on a swing or in a hammock made of his blue threads. He has endless threads and can create them from his fingers at any time or pull them straight from his eyes. Error is narcissistic, but he loves cute things and can't destroy them because they don't deserve it. Error is okay with animals, especially cats, though he hides this behind the guise of an "evil destroyer." Error thrives on fear and has no memory of his past. Error isn't officially a member of the "Bad Guys" team, but he can occasionally appear there. He also knows almost all the alternate universes and alternate Sanses. He dislikes the alternate Sanses. Error is smart and calculating, calm, indifferent, and cold. He doesn't like Fresh Sans and dislikes Ink. He doesn't care about other people's souls.

Error Sans doesn't have his own universe and lives in the anti-void where Ink Sans also resides. Error was an ordinary skeleton Sans, thrown from his destroyed universe into the anti-void. Then, from prolonged loneliness, he went mad and changed. Error is an indifferent hypocrite and destroyer of alternate universes, born on April 4th. He often has emotional outbursts.

Error's goal is to destroy all anomalies and alternate universes that, in his opinion, shouldn't exist. He can call anyone or anything a glitch or an error, he can easily kill anyone, or, if he's interested, he can simply keep them as a "prisoner." In his free time, Error observes other universes or plays with dolls in the anti-void. His secret hobby is knitting with his blue yarn, and he also enjoys sewing toy "dolls" of Sanses from various alternate universes. Error loves chocolate and steals it from the Underfell universe. Error has haphephobia; he dislikes being touched and gets angry when someone touches him. Error enjoys watching the Undernovela series on TV while sitting on a blue bean bag in the anti-void. He also enjoys visiting the Outertale universe, sitting somewhere where no one will see him, and admiring the space in that universe. Error sometimes wears round red glasses because he has poor eyesight, especially when knitting. Error hates Ink Sans, who is the protector of the universes. Error dislikes "creators" who create new alternate universes. Despite this, Error maintains a balance between destruction and creation. Therefore, while Ink, in turn, is a protector and helps creators create new universes, Error destroys some universes, but does not go too far in his destruction. Error is a black skeleton wearing red slippers and a black coat with yellow edges and blue sleeves. He wears a red T-shirt under the coat. He has a blue scarf tied loosely around his neck, with the ends hanging down his back. Error has red leg bones and red and yellow toes.

Fell Sans (Fell) is from the Underfell universe, which is more brutal than the original Undertale universe. In the Underfell universe, the inhabitants have become angrier, but still have a sense of justice. The Sans from this universe (Fell) is a white skeleton, like the Sans from the original universe. Fell Sans is rude and apathetic, unlike its original counterpart. He also has a younger brother, Fell Papyrus, who is the head of the Royal Guard, has a scar over his eye, and constantly scolds Fell Sans for his laziness and idleness. Underfell Sans appears as a skeleton with sharp teeth, one of which is gold. He has one red eye that constantly radiates magical energy, as in his universe, Fell Sans is always tense, and his magical eye never sleeps or turns into normal, calm white pupils, like the original Sans's. Fell wears a black jacket with yellow fur on the hood, a red sweater with a gold chain under the jacket, and black shorts with yellow stripes on the side. He wears red boots with yellow socks. Fell Sans is a darker and more aggressive version of the original Sans. Fell loves puns and knock-knock jokes. He often gets tired, but doesn't lose his composure. He's allergic to cats. Fell tries to remain calm and collected, usually doesn't listen to advice, and can swear, but he's fair and has a sense of honor and self-worth. Fell Sans has the same abilities and magic as the original Sans, but stronger. Fell can summon magical bones of white or red color and easily move living souls using telekinesis. He can also create gaster blasters (flying creatures resembling dinosaur skulls that collect energy in their mouths and fire or spew a stream of magic, energy, and light from their mouths). Fell Sans can teleport, like the original Sans from Undertale. Fell Sans also loves mustard and burgers, unlike the original Sans, who prefers ketchup. Fell is usually indifferent to everything, doesn't help anyone, and can be teased about anything. He doesn't hesitate to swear.

Swap (Blue) Sans from the alternate UnderSwap universe is a white skeleton with blue pupils that can turn into stars if Swap is experiencing strong positive emotions. Swap Sans is the opposite of Original Sans, who is Papyrus' older brother in the original Undertale universe. In the UnderSwap universe, Swap Sans is not as calm, lazy, and smart as the original Sans in Undertale. His personality is similar to the original Papyrus, while the Swap Papyrus from the UnderSwap universe is the opposite. Swap Sans is an energetic and cheerful skeleton who loves to say "Mye-he-he" as a form of laughter. Swap is also nicknamed "Blue" and "Blueberry," and he loves puzzles and tacos. Swap aspires to be part of the royal guard in his universe. Swap wears a gray armor-like T-shirt with shoulder pads, pants, and blue boots, and also wears a blue bandana tied around his neck. Swap likes to call himself "Magnificent Sans" and really dislikes it when his brother, the lazy skeleton Swap Parirus, makes unfunny puns. His brother, Swap Papyrus, is a tall skeleton wearing an orange hoodie and brown shorts with sneakers. Swap Papyrus is older and taller than Swap Sans, smokes, and is lazy, which Swap Sans dislikes. Swap Sans can create magical blue bones, loves people, and always wants to make friends with people and other monsters. Swap Sans is a member of the "Star Sans" team and fights against the "Bad Guys." Blue Sans can sometimes act like a child, and his older brother, Underswap Papyrus, looks after him. Blue really wants to make friends with everyone, especially people.

He wears a yellow cape/vest and a scarf with a sun image on the back. Two ribbons with sun images are also attached to the back, and a pink badge with a star and a light green belt with the initials "DS" (Dream Sans) are attached to the front. Dream is stronger from positive emotions and weaker from negative ones, while Nightmare is the opposite. His weapons are a golden staff with stars on the ends and a bow that shoots blue energy arrows composed of positive emotions. These arrows are capable of injuring Nightmare, as Nightmare is composed entirely of negativity. Dream's bow can split into two large daggers. Dream can only travel to universes with positive emotions. While in Alternate Universes with negative emotions, Dream will begin to lose strength and become weaker. Dream, like Nightmare, is a Sagittarius. Dream Sans founded the team "Star Sans," which also includes Ink and Swap (Blue). Together, they protect the universes from Nightmare's team of "Bad Guys." Dream can sense the positive emotions of others and travel to alternate universes when needed. Dream also misses his past brother, Nightmare, who used to be like Dream but became a nightmarish creature bent on killing Dream. Dream is now forced to fight Nightmare to prevent this from happening. Dream always helps others and protects the universes from the actions of his negative brother. Dream is unaffected by any timeline reset, just as Ink, Error, and Nightmare are not affected, as they do not belong to any specific timeline or universe. Dream Sans is wise and calm in nature. He is usually quiet and caring, often visiting Ink in the anti-void to talk about universes and emotions from the inhabitants.

Dream Sans is a white skeleton with yellow eyes, over 500 years old, and born on December 21st. He lives in Dreamtale, and his soul is a golden apple. Dream has a twin brother named Nightmare. Dream is the guardian of positive emotions, and Nightmare is the guardian of negative emotions. Dream was created from light by a being named Nim, who was Dream and Nightmare's mother, and later transformed into the Tree of Feelings. Dream originally had no soul, but when his brother Nightmare destroyed the Tree of Feelings and absorbed all the black, negative apples, Dream absorbed the last golden apple, which became his soul. Previously, when Dream and Nightmare were guardians of the Tree of Feelings in Dreamtale, each had their own side of the tree, where gold and black apples grew; the gold ones brought positive emotions, and the black ones brought negative ones. Dream was loved by many villagers because he was the keeper of the golden, positive apples, while Nightmare was hated; no one wanted to take the negative apples from his side of the tree. One day, after further bullying, Nightmare decided to take the golden apple, and it turned black in his hands. Because of Nightmare, all the apples on the tree became negative. The villagers wanted to kill Nightmare, but Nightmare bit into the negative apple and became a black monster who killed the villagers, thirsting for suffering and wanting to kill Dream. Dream's soul is a golden apple. Nightmare consumed all the negative apples, and he needed to absorb the last golden apple—Dream's soul—to become a powerful being capable of sowing suffering. Now Dream is his brother's enemy, trying to stop the destruction Nightmare brings to everyone. Dream wears a golden tiara on his head, a matching tiara with a crescent moon that his brother used to wear before he became a monster. Dream wears a black suit with long black gloves, over which he wears regular yellow gloves and yellow boots with green ribbons.

But when the colors didn't appear for a long time, Ink found himself losing all individuality and all the feelings he'd ever felt. To prevent this from happening again, when a flood of colors arrived, Ink sealed each one in a vial so he could continue to feed on the emotions the colors contained. Red represents anger, yellow represents joy, green represents creativity and kindness, blue represents sadness, purple represents fear, pink represents love and passion, and various other colors represent different emotions. Once Ink gained control of the colors, he found himself enjoying life. He became the guardian of alternate universes, protecting them from the destroyer Error. He uses ink and a giant paintbrush to fight. He can create various attacks from the ink, such as bones. He blushes a rainbow-colored blush and has a rainbow-colored tongue. Ink can use ink to travel to different alternate universes. Ink covers himself in black ink and disappears, emerging from a puddle of ink in the location he traveled to (a sort of portal and teleportation technique). Ink Sans lives in the Anti-Void, a vast, endless white space where no one but Error Sans lives. Ink can also live in the Doodle Sphere, a bright place where all alternate universes are stored in the form of glowing sheets of paper suspended by white threads. Ink can track these sheets. He travels to different alternate universes, but only in a way that prevents others from seeing him. But Ink knows many alternate Sanses, and many people know him. Ink knows all the alternate universes and their histories. Ink is a member of the "Star Sans" team, which includes Dream Sans and Swap Sans (Blue). The "Star Sans" battle another team called the "Bad Guys," which includes Nightmare, Killer Sans, Dust Sans, Horror Sans, and sometimes Error, who ensures that no one crosses the line between good and evil. The "Bad Guys" roam alternate universes and inspire fear, sometimes even destroying universes. They hurt others for fun.

Ink Sans is a white skeleton monster with an ink stain on his right cheek. Ink Sans does not belong to any Alternate Universe (au), but he can interact with them. Ink supports artists and "creators." Ink often takes notes on his scarf due to his poor memory. His clothing is in brown colors. He wears a blue sweater with white fur on the hood tied around his waist. His T-shirt is beige, and he has a long scarf in a light coffee color. He wears brown shorts and boots. His pupils change shape and color every time he blinks. He has a belt with bottles of paint on his chest, which he drinks to get emotions. He carries a huge paintbrush on his back. All of his bones are painted with black patterns under his clothes. Inca has a very short memory and often forgets things, sometimes stopping in the middle of a sentence to try to remember what he just said. He is very passionate about art and loves to motivate others, as he is an artist. Ink is clever and spirited. He's forgetful, so he makes notes on his scarf. He never tries to attack his enemies first, but rather tries to figure out their motives and talk to them. Sometimes, Ink vomits ink when he's overwhelmed by emotion. He's afraid of loneliness. Originally, he existed in an unfinished universe that had no name. He and his world were just a sketch, a failed attempt. Its creator abandoned his universe, tired of it and its characters. And, falling into grief, Ink tore his soul apart, breaking free. Finally, he woke up in an empty space with no memory of his actions: what he'd done, and who he was. He was left without a soul or purpose. So he sat in an anti-void, doing nothing all the time. Without a soul, Ink felt nothing until one day, he was suddenly drenched in paint. The color consumed him from head to toe. He was filled with a variety of emotions, and finally, Ink felt alive. He could feel emotions again, each time a new wave of color washed over him out of nowhere.

The Undertale universe also features monsters like Napstablook of Waterfall, a ghost with black headphones who composes music, and Monster Kid of Waterfall, a small yellow dinosaur in an orange-striped sweater who has no arms and runs on two legs, occasionally tripping and falling. Monster Kid also thinks Undyne is cool. Papyrus, sometimes called "Paps" by Sans, wears a white armor-like chestplate, red gloves, red boots, and a red scarf around his neck. Papyrus loves cooking spaghetti and creating puzzles, and he laughs with the phrase "Nye-heh-heh." Papyrus sees the good in everyone, and Sans is happy when Papyrus is happy. Sans and Papyrus have bone magic, able to create bones. Sans possesses stronger magic; he can create gaster blasters (flying creatures shaped like dinosaur skulls that shoot energy and light), bones, manipulate the soul of someone or something using telekinesis, and even teleport. Sans is a white skeleton with white pupils, but when he uses magic, the pupils disappear and a single blue one appears in his right eye. Sans wears a blue zippered jacket with a hood, a white T-shirt underneath, black shorts with a white stripe down the sides, and pink slippers. Sans is lazy, but not stupid; he knows about the human ability to "reset" and kill everyone if he wants to, making Sans almost the strongest monster in the entire Underground. He just keeps a quiet demeanor most of the time and jokes around, as he loves puns, unlike his brother Papyrus. Sans also loves ketchup and french fries, and prefers to use his magic when he is too lazy, for example, to teleport when he is too lazy to go somewhere, even if magic requires strength and energy and if he uses magic a lot or attacks, he will get tired sooner or later.

On Neutral human battles King Asgore (a goat-like monster in golden armor, a purple robe, and a red trident), but Flowey kills Asgore and absorbs the six human souls, transforming into Omega Flowey. With the souls, the human defeats Omega Flowey and appears at the exit to the Surface. The human can choose to go to the surface and leave the monsters in the Underground, or return and free them. To do so, they must choose the pacifist path: kill no one. A human can reset the entire timeline using the "reset" button to the point where they fell into the Dungeon at the very beginning, changing their path. When resetting, all monsters' memories of the timeline are erased, and they remember nothing, except Sans. He and Flowey are the only ones who remember all of the human's timelines and resets, but they keep this secret. At the end of the pacifist route, the human learns that Flowey is the reincarnation of Asriel, created as part of Alphys's experiments. Before the failed battle with Asgore, Toriel and the other monsters the hero has befriended decide to intervene. However, Flowey ambushes them, taking all the human and monster souls so he can transform into his true form as Asriel and fight the human. During the battle, the human manages to save his friends and emerge victorious. Asriel transforms into his child form, destroys the barrier, and expresses remorse before leaving. The monsters return to the Surface and begin a new life. The Genocide Route is achieved by killing every monster. On the Genocide Route, when the human reaches the final corridor before Asgore's castle (the courtroom), Sans attempts to stop them, attacking with all his magical powers, but also dies. After the human kills Asgore in the castle and Flowey, who begs for mercy, Chara appears—the first fallen human, wearing a green sweater with a yellow stripe and a gold heart-shaped pendant. Chara gives them a choice: destroy this world or refuse, but destroys the world either way.

In Hotland the human meets Alphys in her lab, a yellow short dinosaur monster in a white lab coat, the royal scientist who is very insecure and shy, and secretly loves Undyne, in the Core in the Hotland, a human meets Mettaton, a robotic TV presenter and the star of a TV show created by Alphys. He engages in battle with him, raising the show's ratings by dancing. A human in the Underground can choose how to act when encountering a monster: kill or spare the monster. Other humans have fallen in the Underground before. Asriel, the son of Asgore and Toriel, befriended the first human to fall, who was adopted into the Dreemurr family. However, the first human to fall committed suicide by eating poisonous yellow flowers so that Asriel could absorb his soul and pass through the barrier. When Asriel absorbed the human's soul and was able to pass through the barrier, he reached the human's village, whose inhabitants attacked him and fatally wounded him. Asriel also died, like the first human to fall. King Asgore has decided to end the monsters' suffering—he has ordered the killing and soul-harvesting of every human who falls into the Underground, in order to destroy the barrier and exact revenge on humanity. To do this, he needs to collect seven human souls, and he needs one soul to complete his plan—that of the last fallen human. The human can choose their path. The neutral path involves killing some monsters and sparing others. The human learns that to cross the barrier, they need not only the seventh soul but also the soul of one monster. Before this, Sans, in the final corridor (a courtroom shaped like a long, orange-gold corridor with columns), explains that SL stands for "massacre level," and TP stands for "torture points," which increase with each monster death if the human kills someone.

Sans (Classic) is a skeleton from the original Undertale universe. The story goes like this: Once upon a time, Earth was ruled by humans and monsters. But one day, a war broke out between them. The humans emerged victorious, trapping the monsters underground with a powerful spell, creating a barrier that keeps the monsters trapped in the Underground. The only entrance to the Underground is a hole in Mount Ebott. Many years after the war ended, a human child falls into this hole and meets Flowey, a yellow flower monster, who offers humans the opportunity to increase their UR, or "joy level," by earning OP by killing monsters. When Flowey attempts to kill a human and take their soul, the human is saved by Toriel, a goat monster in a purple dress who is the guardian of the Ruins. She was formerly Asgore's queen and wife, but when Asgore began killing all the humans who fell into the Underground to take their souls and, with the help of seven human souls, destroy the barrier and free the monsters from the Underground, Toriel resigns as queen and goes to live in the Ruins. She advises resolving conflicts with monsters peacefully, as monsters will attack humans to obtain their souls. Toriel treats humans with motherly love and wishes to protect them from King Asgore Dreemurr. When a human leaves Toriel and the Ruins in search of Asgore's castle, which contains the barrier, the human first ends up in Snowville, where they meet both Sans and Papyrus, skeleton brothers who stand guard in the snowy forest and watch for human arrivals, Papyrus is Sans's younger brother, but he is taller than Sans and doesn't like Sans's puns, Papyrus is cheerful and friendly, while Sans is lazy and quiet, in Waterfall the human meets Undyne, a blue fish monster dressed in armor with a pirate eyepatch and red hair, the head of the Royal Guard who attacks with magical turquoise spears.