The main antagonist of [i][[Gravity Falls]][/i]. 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 [[personification|personifications]], he usually becomes a [[blonde_hair|blonde haired]] man with either a yellow [[suit]] or a [[waistcoat]], and often missing an eye. Wears a [[bowtie]] regardless of form.

[b]Major Spoiler[/b]

[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.[/spoiler]
ビル・サイファー