Bill is a triangular, one-eyed inter-dimensional demon from the Nightmare Realm. He presents himself as a chaos god with a yellow, triangular body, a small top hat, a bowtie, and four noodly, human-like limbs. He typically floats to move and uses telekinesis to interact with objects. Bill has a twisted sense of fun, believing that turning a universe into an upside-down, chaos-filled nightmare is the best way to party.