Also known as: ビル・サイファー
The main antagonist of Gravity Falls. A triangle-shaped demon who causes destruction and madness for fun. Manipulative and tricky, with a very black sense of humor and a fondness for making deceptively appealing deals.
One-Eyed with a long, black pupil. Wears a Top Hat and sometimes carries a Cane. In personifications, he usually becomes a blonde haired man with either a yellow Suit or a Waistcoat, and often missing an eye. Wears a Bowtie regardless of form.
Major Spoiler
Helped the real Stanford Pines build a multidimensional portal in the hopes of unleashing Hell on Earth and releasing his demon acquaintances in an event known as Weirdmageggon.