He is a demon capable of entering the mind and taking over the body of a person, leaving the possessed person's mind in the "Mental Escape", as if it were a ghostBill is a dream demon who thinks everything is fun and has no remorse when killing or destroying things. He is a manic character, unpredictable and can even be sadisticappearance of a fluorescent yellow triangle, it has a large eye similar to that of a feline and with eyelashes, at the bottom of its head it has brick-like features.