Bill Cipher, Gravity Falls Wiki

Bill Cipher was a triangular interdimensional demon, formerly existent only in the mindscape before succeeding in gaining access to the real world. He had been running amok in Gravity Falls, Oregon since being summoned by Ford Pines over thirty years ago and was also known for his mysterious demeanor and sadistic humor. Bill is the main antagonist of the series. He does not play a central role in the series until his first physical appearance in "Dreamscaperers". He has background parts, such as

Bill Cipher, Gravity Falls Wiki

Found this bit about Bill's gender on the fandom wiki page. Anyone

Bill Cipher, Villains Wiki, Fandom

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Bill Cipher - Incredible Characters Wiki

What can Disney learn from the “Gravity Falls” Cipher Hunt

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Bill Cipher - BrandMentions Wiki