Gravity Falls

Bill is a yellow, two-dimensional and triangular creature that bears a strong resemblance to the reverse side of the Great Seal of the United States, which in turn consists of the Eye of Providence and an unfinished Egyptian pyramid. The color of his body briefly becomes lighter when he speaks. Often when he appears, the area he appears in takes on a washed-out monochrome appearance. He has a single large eye with a slit pupil, rimmed with four short black lashes on the top and bottom, though sometimes there are three on the top and four on the bottom. He moves around mostly by floating about and rarely actually stands on his own legs. He has thin, black limbs, wears a small, black bow tie and a tall, thin, black top hat that floats just above his head. He has no mouth whatsoever, though has been shown using his eye as one to drink something. His arms do not seem to be in any fixed position and can move along the perimeter of his body without any difficulty.

Bill is a cunning, blasphemous, eccentric, sadistic, psychopathic and physically irreverent being who finds most things amusing, particularly if they cause distress or harm to others. He is outrageous and outlandish, as well as a quick talker and thinker. He is outrageous and outlandish, as well as a quick talker and thinker. Though he may come across as simply annoying, he shouldn't be underestimated; for when he is angered, he is a force to be reckoned with as he will unleash his near-omnipotent powers on those unfortunate enough to make him angry. When accused of being insane, Bill proudly agrees with the statement. He is also shown to be somewhat obnoxious, as seen when he makes his presence known to Dipper when the latter is trying to figure out a password within a limited amount of time. As a demonic dealmaker, Bill is also a highly manipulative, very charismatic and charming conman being able to easily trick.

He originated from a two-dimensional universe known as Euclydia. When he was born, he was beloved by everyone so much. However, Bill despised living there, describing it as a dimension of "flat minds in a flat world with flat dreams." There was one other thing about him that was different; he had a mutation that gave him an abnormally large eye that allowed him to see the third dimension. With that, he had the ability to see a direction known as "up," something all others of his dimension could not see. Despite talk of a "third" dimension was illegal in his world, Bill was unable to think of anything else but being able to join it. In an event known as the Euclidian Massacre, he liberated his dimension by plunging it into burning chaos, along with everyone he had ever known. He is unable to fully recount the details of the massacre (whenever he does, a loud buzzing noise begins in his ears and he blacks out).