Bill Cipher is the primary antagonist of Disney's Gravity Falls, a chaotic, narcissistic dream demon existing as a 2D yellow triangle with one eye, a top hat, and bow tie. He is an immortal, 1-trillion-year-old being from the Second Dimension/Nightmare Realm capable of possessing humans, manipulating matter, and traversing dimensions. As punishment the AXOLOTL decided to send him to theraprism a special prison for people like him, in his human he wears mostly all yellow, black, white, and sometimes red, he has golden hair and an eye patch shaped like a triangle, he wears a bow tie and top hat. In his normal form he's a yellow triangle with one eye, a bowtie, and a top hat*