Bill Cipher

A one-eyed yellow triangle demon who can be summoned into a person's mind and seeks to conquer reality.

Bill Cipher is an interdimensional demon who serves as the main antagonist of the animated series Gravity Falls. Unlike typical monsters, Bill exists outside normal dimensions and can be summoned into a person's mind. Hirsch designed him as a figure of pure chaos, representing an existential threat to the town of Gravity Falls, Oregon.

Quick Facts

Character type: Interdimensional Demon
Status: Main Antagonist

Lore & Background

Bill Cipher is defined by his ability to be summoned and released into a human mind. His visual design is specific: a one-eyed yellow triangle that looks like the Eye of Providence, complete with a top hat and bow tie.

Reader's Guide

Bill Cipher acts as the overarching threat throughout Gravity Falls. He is characterized by his distinct appearance—a one-eyed yellow triangle with a top hat and bow tie—and his ability to invade minds. As the main antagonist, he stands in opposition to Dipper Pines (voiced by Jason Ritter), Mabel Pines (Kristen Schaal), and their great-uncle Stan (Alex Hirsch). Hirsch outlined the story's conclusion before pitching the show, meaning Bill's defeat was planned from the start.