Bill Cipher was a triangular inter-dimensional demon, formerly existent only in the mindscape before succeeding in gaining access to the real world. Bill is a cunning, blasphemous, eccentric, sadistic, psychopathic, and physically irreverent demon 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. Though he may come across as simply annoying, he shouldn't be underestimated.. Deal Maker