Batman's eternal Arch-Enemy, a psychopathic Monster Clown with a sadistic sense of humor, a wide array of joke-based gadgets, and a keen strategic mind despite his rampant insanity. His origins are unknown and contradictory, possibly even to himself, but what is certain is that at one point he fell into a vat of chemicals that changed his appearance and erased any sort of mental restraint. The Joker loves nothing more than to spread chaos, death, and anarchy in his never-ending duel with the Dark Knight, all for the sake of a good laugh.