No name strikes terror into the hearts of Gotham City's citizens quite like the Joker. In a city overrun with larger-than-life criminals, the always-laughing villain stands alone. 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. But there isn't a single thing funny about this particular clown, who only finds humor in the suffering of others.