Bill Cipher is the main antagonist of Gravity Falls and the most powerful being in the entire universe. He truly cares for no one except himself (and maybe a few demon friends) and will do anything in his power to get what he wants. As of now, …

However, when he gets angry, his voice deepens significantly, the color of his body turns red and his eye turns black with a white pupil, (in close-up, his eye shows a red iris.) and everything on his body that was previously black turns white.

Bill Cipher is the main antagonist of the Disney Channel/Disney XD animated series Gravity Falls. He is an immensely powerful dream demon from the Second Dimension who is trillions of years old and desires to open a gateway between the Nightmare Realm and the Fourth Dimension to cause an event known as Weirdmaggedon and spread his madness ...

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Bill is a floating yellow triangle with a single cat-like eye in the center, who is an immensely powerful dream demon from the Second Dimension, who means to bring about the end of the world by opening a rift between his Nightmare Realm and the real world.

When angered however, his color is inverted, whith his eye turning black, outline turning white and yellow turning a glowing red, although his form can change to that which is desired at will. A tapestry hanging from the wall in Northwest Mansion Mystery depicts him as black or ash grey instead of yellow and with a red eye.

Bill's body also flashes when he speaks, as he has no mouth. When angered however, his color is inverted, with his eye turning black, outline turning white and yellow turning a glowing red, although his form can change to that which is desired at will.

However, when he gets angry, his voice deepens significantly, the color of his body turns red and his eye turns black with a white pupil, (in close-up, his eye shows a red iris.) and everything on his body that was previously black turns white.

Bill Cipher is the main antagonist of the Disney animated series Gravity Falls. He is an ancient dream demon from the Second Dimension who wishes to trigger an event known as "Weirdmageddon," in which the Nightmare Realm and the …

Being underestimated - it makes him angry to the point he will unleash his near-omnipotent powers on those unfortunate to anger him. He's a force to be reckoned with.