The Laughing Lunatic. The Clown Prince of Crime. Batman’s greatest enemy. That’s how The Joker sees himself. With his white skin, green hair and constant grin, this villain has made it his life’s goal to cure Gotham City’s all-so-serious grimness and gloom. He might break the law, but he really just wants to make people smile…and to rule the city…and to get Batman to finally admit that he is his greatest enemy. Is that too much for a super-villain to ask? Bat-Fact: Never laughs at Harley Quinn’s jokes.