The Joker


"A homicidal artist and an agent of chaos, the Clown Prince of Crime is the embodiment of everything Batman fights against…and everything he fears. No name strikes terror into the hearts of Gotham’s citizens quite like the Joker. A complete psychopath with no moral compass whatsoever, the Joker, whose real name and identity remain completely unknown, is characterized by his chalk-white skin, green hair and a permanent rictus grin stretched across his face." (DC comics)