Gravity Falls- The evil triangle god

Bill Cipher is a two-dimensional interdimensional dream demon from the now destroyed dimension, Euclydia. Formerly existent only in the Mindscape, Bill briefly succeeded in gaining access to the real world and a physical form. He had been running amok in Gravity Falls, Oregon since being summoned by Ford Pines over thirty years ago. Known for his mysterious demeanor and sadistic humor, Bill is the main antagonist of the overall series.

Over one trillion years prior to the events of the series, Bill Cipher was born. He originated from a two-dimensional universe known as Euclydia. When he was born, he had Velcro shoes that squeaked when he ran 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." There was one other thing about him that was different; he had a mutation that gave him an abnormally large eye that allowed him to see the third dimension. With that, he had the ability to see a direction known as "up," something all others of his dimension could not see. Despite talk of a "third" dimension was illegal in his world, Bill was unable to think of anything else but being able to join it.

Although boasting about having a good life, during an inebriated rant, he 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. In an event known as the "Euclidian Massacre", he "liberated" his dimension by plunging it into burning chaos, along with everyone he had ever known, including his own parents.[5] Possibly due to the inherent trauma of the event, he is unable to fully recount the details of the massacre (whenever he does, a loud buzzing noise begins in his ears and he blacks out). Given that, 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.[8] 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 dimension's 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."[9] 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.[10] The area would eventually be rediscovered by Quentin Trembley and repopulated by pioneers, giving rise to the town of Gravity Falls.

For the next centuries, Bill attempted to get his portal built with the help of various other humans from the ancient Egyptians, Aztecs and even Easter Island heads. His attempts in the dark ages with a wizard gave rise to "Cipherstitions" in the old, causing him to flee to the new world to try and get his portal built there. Bill tried using New England settlers to no avail and even convince the leaders of the then newly created America to help him. His attempts would lead to the rise and fall of a group in 1901 known as the Anti-Cipher Society that tried to defeat him and spread awareness about his deception. They were deemed a joke and disbanded.

In 1952, Bill possessed a dead body of an infamous conman named Silas Birchtree, who used his charisma to start a cult named Ciphertology in the Kansas town of Orchard Lake. Almost every citizen became the member of his cult, except for Emmaline Butternubbins, a local nag who knew about his true identity. Bill then ordered his members to build a portal for him, but before he could finish it, his signals were picked up by the law enforcement, who arrived to shoot down the cultists, along with Bill in Silas' body. Bill tried to deliver one last message to people, but Silas' body got decapitated, as he left it, and his cult seemingly disbanded. Bill would later attempt to get his portal built with the help of animation in the 1930s that led to a failed and cancelled series about him, using nuclear tests to get it going, hiding cryptic messages in music, creating computers and even dolls. Despite all these failed attempts, his closest chance at success came when one day, someone broke the Shaman's curse, allowing him to return to Gravity Falls, Oregon.

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 cave containing the ancients' stories of Bill Cipher. Heedless of the warnings, Ford repeated the incantation aloud, breaking the curse and 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 inter-dimensional gateway beneath it and his home (later becoming the Mystery Shack), recruiting his college roommate and 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, 1983, 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." It is later revealed that Fiddleford saw Bill removing his exoskeleton to feed. He promptly abandoned the project.

The suspicion planted in him by Fiddleford led to a confrontation between Ford and Bill, during which Ford learned that Bill had tricked him, as the portal was meant to act as a gateway to the Nightmare Realm, allowing the demon to bring chaos and destruction into their universe. Horrified and betrayed, Ford shut down the project and attempted to destroy all knowledge of the portal, before accidentally falling through it himself. Bill either could not see Ford in the thirty years he spent lost in other dimensions or did not care to, as Ford would remark that they had not seen each other in many years. With the loss of his human pawn, Bill also lost physical access to the third dimension. Despite trying to come up with other schemes, he remained more or less inactive from trying to find a new pawn.