powerful characters from various phantoms

Bill will be in humanoid form: yellow hair below the shoulder, more frightened towards the ends and two highlighted strands in the front, yellow eyes with cat-like pupils and rather long eyelashes, usually wears black pants, a yellow T-shirt with an eye on the chest (which, in principle, was alive, or rather part of his ability) and long black mittens, glasses hang on a black ribbon around his neck (usually he saw with his ability and his real vision was not very good, but no one knew about it). Small anatomical features: a fairly thin waist, fluff on the chest (somewhat reminiscent of a woman's breasts), ears (somewhat reminiscent of cat ears) which many confuse with part of the hairstyle, a rather long thin but fluffy tail (which, in principle, can even strangle) if desired, six wings can appear. Due to some atonamic features, some have a question about his gender.

An elf planeswalker who is over two million years old and effectively immortal.
The creator of the corrupted skint and the founder of the Church of Purification, the skint is an important element of the lore: it changes the world and the creatures themselves.
He has a son, Egrassel, and his relationship with him is an important part of the character's tragedy: Tadmavriel used his son's powers for his experiments.
Character and motivation
He used to be wise and beneficial to the world of Archaea, but after the death of his wife, Teirassa, he became cruel and obsessed with science. For him, research and power are more important than family and the lives of others. At the same time, he has a unique code of honor and is able to predict the future (including through the use of skint).
Appearance
Initially, he was a typical elf: tall, with pointed ears, gray hair, and pale green eyes. After being infected with skint, his eyes began to glow purple, and his body became partially covered in crystals; he later gained control over this, leaving only the infected marks on his shoulders and around his eye. He wears a purple cloak. Planeswalker abilities. As the bearer of the warped spark, Tadmavriel can move between worlds and enter the timeless wasteland.

Effective immortality. The blood of the Origin flows through his veins—a force that is alien to the concepts of life and death. He cannot die unless he so desires (which is why conventional means have failed to kill him). Creation of an Infected Skint and an Anti-Skint. He is the creator of the Infected Skint and also knows how to create an Anti-Skint.

Infection and control of the infected. Capable of infecting creatures and completely controlling those already infected.

Foresight. Using skint, Tadmavriel is able to see the future—hence, he knew of certain key events in advance. Teleportation. He can instantly move through space.

Materialization of objects. For example, he can materialize objects like chairs.

"Father's Spear." A special weapon/ability unique to him as "Father."

Main features
Cool-headed and level-headed. The Interworlder almost never acts on emotion. He evaluates situations based on "what will bring the best outcome for the multiverse," not on personal sympathies. Even in critical moments, he speaks with restraint, gives clear instructions, and doesn't waste words. A sense of responsibility and mission. For him, finding the "perfect" timeline is not an ambition, but a duty. He sincerely believes that this is the only way to prevent new catastrophes and the destruction of worlds. Hence his willingness to break the rules: for the sake of the "greater good," he erases lines and rolls back time, even though he knows this makes him a criminal. Loneliness and inner pain. He is the Lololoshka from a lost universe. This loss leaves its mark: the Interworlder maintains aloofness, does not allow himself to get close, and rarely shows vulnerability. In rare scenes, weariness from the constant "correction" of reality and the weight of the decisions made are revealed. Justice and gentleness toward those under his care. According to Louise, as the leader of the Organization, he was kind and understanding: he tried to consider people's motives and not punish thoughtlessly. He treats Lololoshka himself as a strict but caring mentor—guiding him firmly, but always trying to protect him from the worst outcome. Stubbornness and determination. Once he decides that a certain path is the only right one, it is difficult to convince him otherwise. He is willing to accept conflicts and paradoxes, if only to prevent a repeat of the tragedy of his universe.

The Interworlder is essentially an alternate version of Lololoshka himself from a different timeline. His universe perished, and he was picked up by representatives of the Organization; there, he took over the position of CEO, inherited by the previous Lololoshka-director. His main goal is to find the "perfect" timeline and guide other Lololoshkas along the "correct" path.

At the same time, the Interworlder is considered the most dangerous criminal in the multiverse: he has repeatedly changed the course of time, which violates the fundamental laws of the universe.

Capabilities
He has a very wide range of powers, as he is one of the demiurges and planeswalkers:

Movement between worlds and realities, including with other beings.

Time Manipulation: Can rewind time, erase entire timelines using the "Time Sphere," and create new branches of reality.

Creating pocket dimensions (for example, Misr was originally such a dimension).

Adaptation to conditions of different worlds, increased physical strength, durability and regeneration.

Timeline Observation: Able to see the future of time-bound beings and view threads from beginning to end.

Appearance
There are two main versions of the appearance:

Old version: black armor, bright purple glowing stone on the chest, purple eyes, white decoration around the jaw.

New version: dark gray armor with purple elements, a hooded cape, a mask with characteristic stripes and protrusions, purple eyes with a bright white glow.

Role in the plot
The Interworlder sometimes helps Lololoshka, sometimes turns out to be his enemy—his role changes depending on the season:

He repeatedly intervened to roll back time and prevent events from interfering with Lololoshka's mission.

It was he who transferred Lololoshka to the Interworld, citing “breaking signals.”

In some seasons, it appears as an image of Lololoshka's subconscious.
At the end of "The Last Reality," it is revealed that Lololoshka is actually speaking about himself in the third person when he mentions the Interworlder: it is his own possible future.

Lololoshka is the main character of the series of seasons, a planeswalker, one of the First.
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Pin by Rina on Lololoshka in 2025 Cute Drawings, Drawings, Character Sketches
Character
Easy-going and balanced, not particularly talkative.
Kind and fair towards other characters.
Sometimes frivolous, inattentive and naive, which is why he can make objectively wrong decisions.
Gives second chances and trusts people without acting aggressively or self-centeredly.
Can come up with complex ideas and think through intricate plans.
Ironically described as a "gofer" who genuinely enjoys being a hero and helping everyone.
Sometimes he neglects his own time, desires and moral standards in order to be treated positively in the future.
Despite his openness, he doesn’t trust just anyone and carefully analyzes his surroundings.
He may show sympathy towards characters, but this usually does not go beyond friendship.

lololoshka.fandom.com
lololoshka.fandom.com
Appearance
Tall (190 cm).
Pale skin, brown eyes, light brown hair cut short with bangs slightly slanted to the left.
He wears white headphones with black ear pads and blue inserts, as well as blue decorative glasses with black lenses through which his eyes are not visible.
He is wearing a white hoodie with a slight hint of soft blue, black stripes on the puffy sleeves and black laces.
A black and blue checkered scarf, black pants with two blue hanging suspenders, blue sneakers with white soles.
In its embodied state, it became covered in crystals of infected skink on its head, shoulders, and torso, and its eyes changed color from brown to purple.

lololoshka.fandom.com
Attitude towards other characters
John (JDH) is Lololoshka's alter ego. After a detour, their paths diverged, but John's image continues to appear in the hero's memories and visions as a symbol of the past and a lost connection.
Raya is a close friend of Lololoshka. In the final episode of "Point of No Return," Raya's images,

John Davey Harris (JDH) is an alternate version of Lololoshka from another universe.
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lovely John Davey Harris Hello Kitty rooms, Fan art, Graphic designs
Character
Emotional and talkative. He often interrupts others, and almost every word he says is accompanied by a joke or sarcasm.
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fanfics.me
Frivolous, childish. Makes funny faces a lot, behaves like a child or a "grown-up hooligan."
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Spontaneous and unpredictable, his actions often go beyond expectations.
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lololoshka.fandom.com
Toxic and indifferent to others, he carefully chooses his words to humiliate his opponent and demonstrate his own genius.
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lololoshka.fandom.com
He possesses a wealth of knowledge that even Jodah lacks. Despite his childish nature, he continues to improve his knowledge because he hates not knowing anything.
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lololoshka.fandom.com
He's selfish. He doesn't have many friends. The only person who could stand to be with him for more than five minutes was Molly, but John didn't care about her even at the peak of their relationship. He only considers Simon Solus a friend, but to him, he's also a "thing," since John created him.
lololoshka.fandom.com
lololoshka.fandom.com
Appearance
JDH is virtually identical in appearance to Lololoshka, but instead of the usual hoodie and pants, he wears a white business suit. His scarf and glasses are orange instead of blue. When he first appeared, he wore an orange Interworld mask. His body is identical to Lololoshka's, with the exception of his fingerprints. He stands approximately 190 centimeters tall.
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character.ai
Attitude towards Lololoshka
Despite his selfish nature, thanks to contact and communication with Lololoshka, John began to gradually change for the better and become more empathetic to the feelings of others.

Creator of the Rehoboam supercomputer, named after himself; It is in him that his personality is digitized, which gives him a kind of immortality and access to huge computing power.
Owner of a secret bunker under Alt City, where Rehoboam is located and from where the Empire is actually ruled.
A key figure in the construction of the "ideal" world, his vision of order is at the heart of the Empire's entire system of control and punishment.
An important line is related to Raya: he is deeply attached to Raya Aber, was jealous of her, and ended up killing her because she did not share his views and did not respond to his feelings. He later refers to Raya Prime as a continuation of it, although they are different personalities.
Able to predict future scenarios, manage inert PM, control people with implants, create holographic projections, and much more — all thanks to Rehoboam.
Finale: voluntarily chooses to be imprisoned in the Prison of Time, hoping that eternity will help him change; At the same time, he remains the only known prisoner who can leave it at will.
If you tell me which aspect you want to reveal in more detail (for example, relationships with specific characters or abilities), I will tell you in more detail.

Character
Rehoboam is an arrogant and proud person obsessed with the idea of control. He is convinced that people themselves do not know what they want, and the "ideal" can only be built through harsh control, intimidation and punishment. He has a huge intellect and a habit of looking down on others - the status of a brilliant scientist and leader affects.

At the same time, he undergoes a noticeable evolution in the plot: after Lololoshka and Raya correct his memories (which is possible due to the digitization of his personality), Rehoboam realizes how wrong he was. He feels guilty (in particular, because of the death of Raya Aber), tries to correct himself and make amends to Raya Prime. In the finale, he voluntarily goes to the Prison of Time, admitting that he is unlikely to be able to truly change on his own.

Appearance
Facial features and details: black hair, green eyes, wears glasses with thick lenses.
Clothing: black clothing plus lab coat.
In holographic form: over the usual robe - something like armor; The glasses in this uniform are worn on the head.
Height: 192 cmRole
in plot
One of the main antagonists of the season "A Perfect World" (until episode 115) along with Edmund Tennant.
Scientist and supervisor: Doctor of Theology, Applied Mathematics and Natural Sciences; CEO of Halo Terra Industries

In his youth, Ebardo is a tall, confident man with sharp features and piercing green eyes. His dark hair is neatly styled. In one scene, he can be seen wearing gray pants, a white shirt, and an emerald green sweater that beautifully accentuates the color of his eyes. He also has black wings.
The clothes are gray jeans, a white T-shirt and a bright green sweater and, apparently, with the help of magic, gets rid of all the scars.
Character and traits
Young Ebardo is strong, determined, and willful, but also impatient and hot-tempered. He's a gambler and hates losing bets (though he often breaks the rules when he does). Having discovered his powerful abilities, he became intoxicated with power: he began to believe that power alone matters, and that all other beings in the multiverse are stupid and weak-willed. The countless worlds only reinforced his sense of entitlement.
While he strives to maintain a cultured demeanor and values ​​good manners, he also demonstratively emphasizes his superiority, preventing others from gaining the upper hand in conversation. In Episode 96, he notes that he has a "heightened sense of justice"—this can be interpreted in various ways: as heightened vindictiveness or something else entirely.
Due to the torture he endured in Vidomnia and his post-traumatic stress disorder, he can temporarily lose touch with reality when nightmares are mentioned, panicking and convincing himself he's safe. This is why, when the older version of Ebardo first encountered Lololoshka, he mistook him for a hallucination. At the same time, Ebardo is persuasive and hides his true feelings well. He is extremely cruel to his subordinates, keeping them in line through force and intimidation (for example, torturing Impreptok with skintonite until he turned into a Dusk).
A key moment in his past: in his youth, Ebardo stole the sun from the world of Thirteen. It was this crime that led to his imprisonment in Vidomnia.

Role in the plot
Egrassel has a very significant role.
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lololoshka.fandom.com
He is the creator of the First Ones. It was he who empowered and trained the very first planeswalkers.
He is one of the creators of the interworld masks (along with Lololoshka).
Egrassel gave the name and meaning to the term "Betweenworlders": he called himself, the First Ones, and the planeswalkers by this name. He also called the First Mother (Beginning) "First."
When Tadmavriel became completely infected, Egrassel first tried to help his father, but, realizing the futility of his attempts, he resorted to self-sacrifice.
At Egrasel's request, the First Ones sealed the Archaea and erected the Veil.
The First Ones have the elven blood of Egrasel in their veins - he passed it on along with the Spark.

lololoshka.fandom.com
lololoshka.fandom.com
An interesting detail: Egrassel and Lololoshka had been close friends in the past, but due to memory loss, Lololoshka didn't remember this. It was implied that Lololoshka was the first person with whom Egrassel shared the blood of the First Mother.

Character
Egrassel is an elf, and he exhibits the typical traits of his race: tall stature, pointed ears, light hair, and long, slender arms. He is calm, good-natured, and reasonable by nature. He is also quite educated, often using metaphors and epithets in his speech.
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But there's an important detail: Egrassel had long been deeply dependent on his father, Tadmavriel. Almost his entire life, he sought to assist his father in his research, hoping to earn attention and praise. Even after accepting the gift of the First Mother (Between Worlds), he did so primarily for his father's sake—he wanted to show him what true goodness is.
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At a critical moment, when Tadmavriel became infected with the corrupted skint and his personality practically disappeared, Egrassel first tried to help his father by transferring part of his Spark and the power of the First Ones. When this didn't work, he realized his mistake and took the extreme step of sealing himself and his father in the estate and then calling upon the First Ones. Ultimately, Egrassel accepted that his former father was gone, and in episode 57, he asked Lololoshka and JDH to kill himself—to stop giving his father his power and break the seal.
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Appearance
Egrassel looks like a typical Archean elf. In his normal attire, he wears a pale gray shirt, over which lies a green cloak with gold trim and rolled-up sleeves. He also wears a belt with a small pouch, brown pants, and gray boots.
lololoshka.fandom.com
At the moment of his father's sealing, he was wearing more expensive clothes: brown with skint trim and its crystals on the shoulders.
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The main detail that immediately makes his mask stand out is that it is purple, like Lololoshka's, but with a significant difference - a crystal of pure skint is located on the forehead.

What does this have to do with the "First Interworlders"? The First Ones themselves (including Lololoshka) are often referred to as interworlders in the lore. The fact is that the inhabitants of Archaea nicknamed the First Ones this for their ability to travel between parallel realities. And Egrassel was, in fact, the one who originally imbued them with the power of the Spark and taught them how to use it. In other words, he is the creator of the First Ones, and through them, the very idea of ​​"interworlders" in this world.
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Regarding the connection with Lololoshka. There's an important nuance in the plot: once upon a time, Egrassel and Lololoshka were close friends. The problem is, Lololoshka forgot about this due to memory loss. Moreover, Egrassel was apparently the first person with whom Lololoshka received the Spark—Egrassel's alternative calendar even counts from this day. Egrassel considered Lololoshka (like JDH) his "interworldly brother."

Egrassel is an elf and a key character. He is the son of the scientist Tadmavriel. After the death of his mother (Teyrassa), his father embarked on dangerous experiments and became infected with a corrupted skint. Egrassel, wishing to save his father, answered the call of the First Mother (Beginning), who granted him the Spark. He decided to carry this light across the worlds to heal his father.
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lololoshka.fandom.com
Egrassel (Son) Lololoshka
To spread his power, Egrassel gathered a group of the most powerful beings—they are called the First Ones. He shared the Spark with them. But the attempt to heal his father failed: during the ritual, Tadmavriel, possessed by the infection, latched onto his son and began to feed on his power.
lololoshka.fandom.com
lololoshka.fandom.com
Realizing his father was lost and posed a threat to the multiverse, Egrassel made a difficult decision. He summoned the First Ones and asked them to place a powerful seal on the Archaea to isolate the threat. He then voluntarily sealed himself and his father in the ancestral estate in Gahledol. In doing so, he became Tadmavriel's eternal source of power—and simultaneously his jailer.
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Later, when Lololoshka and John reached the estate, Egrassel briefly awoke. He explained the family's tragedy and the true nature of the Father. Realizing that only his death would deprive Tadmavriel of his source of power, Egrassel made his final choice: he asked Lololoshka and John to kill him. With this self-sacrifice, he severed the bond that powered the Father and saved the multiverse from the spread of the infection.

Jodah's character
Selfish and heartless to the point of absorbing the powers of the demigoddess Eola, he openly states that he feels no remorse for killing countless inhabitants of Skyzern. His goal is survival and the acquisition of ever greater power.
Self-satisfied, power-hungry, and slightly arrogant, he can lie to achieve his goals. He yearns for universal justice and believes that non-divine beings have the right to exist. He is quite patient, but strict.
After absorbing Eola's powers, he became filled with compassion, which resulted in his willingness to give up everything he had to help the fairies.
During the season, "The Voice of Time" is pleasant to talk to, but maintains an elevated tone, manner of speech, and self-esteem.
Attitude towards other characters
To Lololoshka. In some stories, Jodah shows concern for Lololoshka, for example, when he tries to find out from the Watcher what happened to him.
To Jon (JDH). Jodah may be indifferent to Jon, but he still respects his intelligence. In one storyline, Jodah, at Jon's request, pretended he too didn't know how to restore convergence, as he saw that Lololoshka was the only one Jon cared about.
To Oketra In some interpretations, Oketra may have a negative attitude towards John, but because of the way he communicates with Lololoshka, she is unconsciously jealous of him and therefore is happy about their quarrels
To Raya In some stories, Raya tries to “measure up” John and Lololoshka because she sees that John is smart, and Lololoshka needs someone who can push him to smart thoughts.
Appearance and appearance
Jodah is a representative of the Avi clan
Wings. After absorbing the powers of the gods, Jodah grew wings: a primary pair, black with red feathers, and a second, smaller pair with eyes that can close and move. Because of this, he is often associated with an angel, hence the nickname "Angel of Death." Jodah wears a black and purple tabard—a long cape or cloak reaching to the knees. A pendant around his neck completes the look, with a stone that shimmers, changing color from blue to red. He has white hair braided in the front and violet eyes.

Phobias and psychological vulnerabilities

Bill doesn't have classic "phobias" like a fear of spiders or the dark, but he does have deep psychological vulnerabilities that act as weaknesses:

Fear of losing control and defeat. Bill is obsessed with chaos and power, so the prospect of being defeated, locked away, or erased is his worst nightmare. This is why he desperately clings to any chance to retain influence.
Fear of being "unnecessary" or forgotten. His egocentrism and desire to leave a mark on the universe make him vulnerable to any devaluation: if he is ignored or attempts are made to erase him from history, he becomes enraged and acts even more aggressively.
A hidden vulnerability to the destruction of one's home dimension. Supplementary materials (including "Bill's Book") hint that behind the bravado about "liberating" one's world lies a sense of guilt and pain over the destruction of one's dimension. This isn't a phobia in the literal sense, but an emotionally sensitive area that can be exploited for psychological pressure.
Aversion to dreamcatchers. One factoid mentions that Bill dislikes dreamcatchers because they "tickle." This is more of a comical and absurd remark than a serious phobia, but it shows that even such a powerful creature has its minor weaknesses.
Overestimation of strength. Bill himself admitted that he sometimes overestimates his strength. This isn't fear in the classic sense, but rather a psychological weakness—a tendency to overestimate one's own capabilities, which can lead to failure.

Weaknesses of Bill Cipher from Gravity Falls

Key Canonical Weaknesses
Limitations in the physical world and in other people's minds. While Bill is in someone's mind or dream world, his power is severely limited: he cannot directly influence reality. He can be defeated through the power of imagination and fantasy—which is how Mabel managed to overcome him in the mental realm.
The Vulnerability of the Eye. The eye is a key part of its being: when damaged, regeneration takes a long time, and the loss of an eye greatly weakens it.
Special rituals and artifacts. Bill can be contained or banished using special means—for example, the "unicorn spell" or a device like a quantum destabilizer. The zodiac with its ten symbols also plays an important role: it was with its help that the natives were once able to resist Bill and leave instructions for his containment.
Protective barriers and anomalies. Environments like the protective barrier around the Mystery Shack prevent Bill from seeing and influencing objects and people within. Furthermore, the natural magnetism of Gravity Falls' anomalies can also destabilize his presence.
Music and sound effects. Synthesized music and certain sound combinations can negatively affect Bill, disrupting his control over space and matter.
Dependence on deals and conditions. To penetrate minds or gain access to certain powers, Bill often needs to make a deal. If the conditions are violated or used against him, it opens the door for a counterattack.
Complete annihilation through "erasure." At the end of Weirdmageddon, Bill is literally erased from existence—demonstrating that he can not only be defeated, but completely removed from reality, given the right method.

Shape and size alteration. Bill can transform his appearance, as well as change the appearance of others, in his dreams.
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Time and space manipulation. After bridging an interdimensional rift, he gained the ability to influence reality on a cosmic scale.
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Fourth-wall awareness. Bill is aware that he is a character in a cartoon series and can "see" the audience. This was demonstrated in the story, for example, by his altering the opening credits during Weirdmageddon.
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Genius-level intellect. Bill is very smart, but not omniscient—he's been deceived many times.
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An important clarification: Bill's power is not absolute. In a "stable" three-dimensional reality, his demonic essence encounters natural barriers. To function, he often requires intermediaries (deals, carriers) or open portals between dimensions. And in someone else's mind, he has no physical body and is vulnerable to things like memory erasers.

Manipulation of minds and dreams. This is the basis of his power. Bill can enter people's dreams, alter their landscapes, extract information from the subconscious of others who are also in a trance, and bring their ideas to life. He can communicate with the one who summoned him, using his body as a videophone screen or projector, showing past and future events.
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gravityfalls.fandom.com
Deal-making. This is Bill's key tool. He offers a person (or another being) a wish or power. The deal is sealed with a handshake, accompanied by a blue flame. But there's a catch: the fulfillment always comes with a terrible, unforeseen price or serves Bill's true purposes. If the person violates the terms, Bill's powers no longer apply.
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Possession and control of a body. With the owner's consent, Bill can extract a person's mind from their body and take over. The host is then "stuck" in the mental space and unable to influence the physical world until they find a vessel. In the host's body, Bill becomes subject to physical limitations: pain (which he initially finds "fun"), exhaustion, and even the host's physical quirks (such as tickling).
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gravityfalls.fandom.com
Reality Warping. Bill is capable of transforming matter at the molecular level, creating portals between dimensions, and causing ripples in the space-time continuum. In his physical form, his powers are expanded: he can animate inanimate objects, transform people into statues of a chosen material, and create "dream bubbles" to isolate victims.
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gravityfalls.fandom.com
Telepathy and clairvoyance. He can read minds and see potential future scenarios.
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Intangibility and regeneration. Being a metaphysical entity, he is invulnerable to physical impact.

Kingdom of Nightmares
Afterwards, Bill found himself in the Nightmare Realm—an unstable, lawless interdimensional space. Due to its lack of rules, it was doomed to self-destruction. There, he began wreaking havoc and encountered various creatures who eventually became his minions.
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gravityfalls.fandom.com
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Prophecy and New Goals
It was in the Nightmare Realm that Bill learned of a prophecy: it said he would be able to merge this dimension with the third (at that point, he had already set his sights on Earth). From that moment on, conquering human reality became his primary obsession. He began manipulating people to gain access to their dreams and ultimately construct a portal for invasion.
gravityfalls.fandom.com
gravityfalls.fandom.com
gravityfalls.info
Attempts to invade the human world
Even before the events of the series, Bill attempted to influence the natives in the place where Gravity Falls would later emerge. He asked the shaman Modoc to build an interdimensional gateway, but Modoc, upon learning of the prophecy, committed suicide. The natives eventually found a way to defeat Bill—using a zodiac with ten symbols. They left cave paintings in a cave describing the battle and an important warning: never read the spell to summon him out loud.
gravityfalls.fandom.com
gravityfalls.fandom.com
Later, in the 20th century, scientist Stanford Pines found these drawings, summoned Bill, and unwittingly helped him build a portal. Thus, the demon gained entry into our world.
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gravityfalls.fandom.com
Interesting details
Bill often distorts the facts to his advantage, so his story about Euclid's "liberation" should be taken with caution.
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According to series creator Alex Hirsch, Bill once had a family.
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In the prison of dimension 5150, Bill wrote a book to later use to escape.

Native Dimension
Bill was born in a two-dimensional world called Euclid. This is a direct reference to Edwin Abbott Abbott's science fiction novel Flatland, where creatures live in a world of flat shapes.
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The inhabitants of Euclid are geometric shapes (triangles, circles, and others). They have characteristics dictated by two-dimensionality: for example, the eye is located on the side, not in the center, and they are physically unable to look "up" or "down."
gravityfalls.fandom.com
Why did he hate his world?
Bill had a rare mutation from birth—he could see a third dimension (the "upward" direction), which others could not. Because of this, he was bullied in college, and his parents even took him to an optometrist in hopes of "correcting" it, which nearly led to his blindness. His fellow tribesmen misunderstood his aspirations and considered him strange. Bill felt like an outsider and despised his limited world, describing it as "flat minds in a flat world with flat dreams."
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gravityfalls.fandom.com
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The disaster known as the "Euclidean Massacre"
Bill decided to "enlighten" his people and show them the third dimension. He put on a show, but in the process accidentally destroyed his entire world, along with everyone in it, including his own parents. Bill later recalled this with intense guilt and shock, and when attempting to describe the events in detail, his ears would begin to ring loudly, causing him to lose consciousness. Due to his trauma, he couldn't even remember all the details and often denied deliberately destroying the world.

Manipulating emotions. He finds a "key" to each one: Dipper is reminded of the victims, Mabel is driven by loneliness, and Ford offers the knowledge he craves.
Playing with reality. He enjoys changing his surroundings, creating absurd situations, and watching people try to figure them out.

Main features

A charismatic manipulator, Bill knows how to charm and win people over, especially when it suits his interests. He presents himself as a "helper" ready to provide answers and solve problems—but always with a catch. For example, he readily makes deals, then interprets their terms to maximize his own gain.
He's selfish and cynical. Other people's feelings and lives mean next to nothing to him: he's perfectly willing to inflict pain, including on children (like Dipper and Mabel), if it brings him closer to his goals. His philosophy is simple: do what you want and don't worry about the consequences.
He loves chaos and destruction. Bill isn't just a villain for the sake of power—he literally enjoys upending the established order of things. Weirdmageddon isn't a means to an end for him, but an end: he genuinely enjoys watching the world around him crumble and lose all logic.
A sadistic sense of humor. He finds joy in others' pain and awkwardness. A telling moment is when, possessing Dipper, he deliberately inflicts pain on his body and comments on it as a funny joke.
Arrogant and self-assured, Bill considers himself smarter than everyone around him and openly displays it. He often speaks in riddles, spouting philosophical phrases like "Reality is an illusion, the universe is a hologram" to emphasize his superiority.
Unstable and impulsive. Despite his calculating nature, he easily becomes enraged when things don't go according to plan. When angry, he becomes especially dangerous and stops "playing the gentleman."
A pragmatist with a touch of madness, he's ready to exploit any human weakness: fears, hopes, guilt. At the same time, he sincerely believes in his own exceptionalism and doesn't consider it necessary to adhere to any rules—either moral or physical.
How does this manifest itself in behavior?

Deals and promises. Bill is almost always honest in his words, but he deliberately distorts the meaning and exploits loopholes. He keeps his word, but in a way that works against the one who made the deal with him.