Bill is a cunning, blasphemous, eccentric, sadistic, psychopathic and physically irreverent being who finds most things amusing, particularly if they cause distress or harm to others. He is outrageous and outlandish, as well as a quick talker and thinker. Though he may come across as simply annoying, he shouldn't be underestimated; for when he is angered, he is a force to be reckoned with as he will unleash his near-omnipotent powers on those unfortunate enough to make him angry. When accused of being insane, Bill proudly agrees with the statement. He is also shown to be somewhat obnoxious, as seen when he makes his presence known to Dipper when the latter is trying to figure out a password within a limited amount of time. occasionally, his voice tumbles to a lower pitch (usually when emphasizing a statement). He also tends to get Drunk a lot.
As a demonic dealmaker, Bill is also shown to be a highly manipulative, very charismatic and charming conman being able to easily trick Ford Pines into believing that he was just a humble muse who simply wished to help benefit the human world by providing him with forbidden knowledge when in reality he was only ever using the researcher for his own purposes with the book smart Ford noting that the only person who could've possibly seen the ruse for what it was, was his street smart brother Stan Pines, who was himself an expert conman.
Bill is not one who believes in rules. Instead, he follows his own selfish philosophy which means doing whatever he wants without care for the consequences. He thinks of laws and physics as senseless and displays an irresistible urge to break those rules down by causing absolute chaos however he can. The lives he ruins hold no merit to him and he finds amusement in tormenting and turning people's worlds upside-down. He also sees reality as "an illusion" and values its destruction.
When possessing Dipper's body, Bill is shown to be rather masochistic, hurting himself in various ways for the thrill of it, exclaiming that "pain is hilarious." He seems to have little knowledge about the human body, specifically its physical limits. This comes back at him when he fights Mabel over Journal 3, as he eventually falls down, exhausted.
As shown in "Weirdmageddon Part 1," he also reacts sadistically whenever a would-be subject oversteps their boundaries, such as when he shuffles "the function of every hole in Preston Northwest face", and in "Weirdmageddon 3: Take Back The Falls" when he decides to kill one of the Pines twins "just for the heck of it."
Bill also suffers from PTSD and Survivors Guilt. Though he repeatedly claims to feel no regret over the destruction of his home dimension even going so far as to say that he had "liberated" them from their dull lives, it is shown repeatedly that this is just another lie he tells himself to avoid the truth. Though he immediately brushes it off, in The Book of Bill, he shows a rare moment of genuine remorse as he recounts the destruction of his dimension. Stanford also recounts a time from one of the lost pages of Journal 3 where he and Bill talked about the destruction of his home, with a shocked Ford asking what it was destroyed by, to which Bill stared off into space for a while and replied in an uncharacteristically serious tone of voice "By a monster." On the silly straws page, there is a code which once deciphered says "Twisted out of shape after the kill, the ghosts of his family are haunting him still.
"Remember!
Reality is an illusion,
the universe is a hologram,
buy gold, BYE!"
Other names
Billy (childhood nickname),
My Muse(by ford)
Bipper (when possessing Dipper Pines)
The One-Eyed Beast,
The Triangle Guy
Isosceles Monster,
Evil Triangle
The Beast With Just One Eye
One Eyed Demon,
Bill Codex (in Dutch dub)
Pointy Jerk (by Mabel Pines)
Unholy Triangle Fella (by Tyler Cutebiker)
William Lucifer (by The Anti-Cipher Society in The Book of Bill)
Chill Cipher (disguised in Mabel's mindscape in The Book of Bill)
One trillion and twelve years prior to the events of the series, Bill Cipher originated from a two-dimensional universe known as Euclydia. When he was born, he had Velcro shoes and was beloved by everyone so much that the mayor declared his birthday a national holiday. On his birthday, Bill gave out free knives to everyone as a gift. In spite of this, however, Bill despised living there, describing it as a dimension of "flat minds in a flat world with flat dreams." During a drunken rant, it is implied that his claims of a good childhood are false and that he was actually ostracized for his mutation, giving him the drive to finally make his race understand what he saw. He "liberated" his dimension by plunging it into burning chaos, along with everyone he'd ever known, including his own parents.This became known as the Euclidean Massacre. Possibly due to the inherent trauma of the event, he is unable to fully recount the details of the massacre; meaning whether he even intended to commit the act to the extent that he did still remains unclear. He eventually took over a boiling and shifting intergalactic foam between dimensions: a lawless and unstable crawlspace known as the Nightmare Realm. Unfortunately, due to the Nightmare Realm's lawlessness and lack of any consistent physics or rules, it was fated to eventually collapse on itself. After coming to learn of a prophecy that stated he would merge the Nightmare Realm with the third dimension, Bill started coming into contact with humans to accomplish this
Without a physical form, however, Bill could only access the dreams of the third dimensional beings. In order to make his dealings with mortals easier, he took on the name "Bill Cipher" as his real name would "evaporate one with an expression of horror and ecstasy on their face."Among his targets were the natives who lived in what would become the town of Gravity Falls, Oregon.
Bill once asked a local shaman named Modoc the Wise to build an interdimensional gateway to the Nightmare Realm, but the result was made out of twigs. When Modoc learned of the prophecy that foretold of an apocalyptic event that would stem from interactions with Bill Cipher, he committed suicide by setting himself on fire in an effort to avert it.
The natives eventually discovered a way to defeat Bill by using a zodiac with ten symbols. They left behind elaborate cave paintings about their encounter with the demon, including how to summon him, and more importantly, a warning never to read the incantation that would summon Bill aloud. The valley was deemed a "cursed land" by the natives, who evacuated around 1000 AD.The area would eventually be rediscovered by Quentin Trembley and repopulated by pioneers, giving rise to the town of Gravity Falls.
In the late twentieth century, a young man named Stanford Pines, who had spent the past six years investigating the town's plethora of unnatural creatures and oddities, hit a roadblock in his research and was left without answers as to how the improbabilities of Gravity Falls had come to be. During the roadblock, he uncovered the ancient cave containing the ancients' stories of Bill Cipher. Heedless of the warnings, Ford repeated the incantation aloud, summoning Bill into his mindscape. Bill recognized Ford's brilliant but cocky and insecure nature, and his near-friendlessness as ideal conditions for manipulation, choosing to introduce himself to Ford as a muse who chose one brilliant mind every century to inspire.
It was Bill who revealed to Ford that Gravity Falls' weirdness was caused by a rift between dimensions, through which the other side's weirdness leaked through. With Bill's assistance, Stanford drafted blueprints to create an interdimensional gateway beneath his home (later becoming the Mystery Shack) and recruited his college friend Fiddleford McGucket for assistance. As Bill and Ford's partnership seemingly grew to friendship, Ford seemed to develop an obsession with Bill's powers, collecting triangular memorabilia such as rugs and statues, modeling his home's architecture in his image, converting his private study into a place of worship. He even allowed the demon to enter his mind; this, along with the amount of information he seemed to simply produce on the spot, made Fiddleford increasingly uneasy of the portal and of Ford's mysterious collaborator, as Ford never mentioned Bill's identity to his partner.
On January 18, 1982, Ford and Fiddleford performed their first trial with the active portal, which quickly went awry, as the rope that was attached to the dummy they intended to send through the portal became tangled with Fiddleford, sending him briefly through the portal head-first. Upon his return, an alienated Fiddleford muttered incoherencies before uttering a prediction about "the beast with just one eye." In Gravity Falls: Journal 3, it is revealed that Fiddleford saw Bill removing his exoskeleton to feed. He promptly abandoned the project.
Bill is happy that inside Ford's mind is "a perfect, calm, orderly void" (a bleak white landscape) with a single wooden door. When Bill opens it, he's greeted by Stan playing paddle ball inside the Mystery Shack. Stan reveals that while the demon was chasing Dipper and Mabel, he and Ford swapped clothes and pretended to be each other so that Bill would enter the wrong mind. Realizing this, Bill furiously calls off the deal, implying that he intends to kill both Stan and the kids to demoralize Ford into letting him into his mind. However, anticipating that Bill would double-cross them, Ford takes out the Memory Gun, setting it to erase Stan's memory completely. In the mindscape, the door shuts and the room becomes enveloped in blue flames thanks to the Memory Gun's influence. Stan explains Bill is going to be erased for good, but the demon retorts, asking Stan if he realizes that his mind is also being destroyed. Bill tries to escape and resorts to bargaining with Stan, but Stan refuses to listen as he has had enough of Bill's actions.
Stan tells him that while Bill may be a real wise guy, he has made one fatal mistake that he never should have made: messing with Stan's family. Bill refuses to accept by claiming that Stan is making a bigger mistake and that he will give him anything that he would desire, until his form becomes heavily distorted as he speaks backward messages (Translated to: A-x-o-l-o-t-l my time has come to burn, I invoke the ancient power that I may return) and attempts to reach out to Stan. Unperturbed, Stan punches the weakened Bill, shattering the demon into pieces as Stan's memory is completely wiped. Following Bill's death, everyone trapped as the tapestries are freed. Outside the Fearamid, Bill's cronies are sucked back into the rift, with the disassembling Fearamid not far behind. The rift itself is then sealed off and explodes into a great shockwave, restoring the entirety of Gravity Falls to its former glory. The only thing that remains of Weirdmageddon is Bill's now-permanently petrified physical form.