Joker

Kay, I'll thank you for bringing this guy to my mind http://upload.wikimedia.org/wikipedia/en/thumb/7/77/250px-JokercolorLG.jpg

Joker is literally a killer clown, but theres nothing really funny about him (except some of his morbid jokes) this man is a sadistic psychopath who loves nothing more than to inflict groutesque, morbid death and terror on innocent people. He is the antithesis of Batman. Whereas Batman represents law and order, the Joker represents chaos and crime. He wasnt always this way though. Apparently before he became a psychotic lunatic, he was an engineer and failed comedian who got strong armed into helping some crooks do a robbery. When the robbery failed and the other crooks were gunned down, he escaped by jumping into a vat of acid. When he got out though, to his horror, the acid had...(not worn away his skin like most acid does) bleached his skin chalk white, made his hair green and put a grim smile on his face. At that moment he went completely insane. The Joker is the ultimate villain, not only is he stir crazy and completely unpredictable, he's also extremely intelligent (he was an engineer after all) Batman tries on many occasions to stop the Joker, but because he's so damn unpredictable its almost impossible. The Joker's victims literally die laughing (he's got a gas that makes people laugh to death) and he does crime and violent acts in the name of fun, there's no meaner Badass than this, 10/10 for this nut case