@courtney12490: Thanks. I don't know too much about the character, but I suppose growing up on Apokolips would make anyone crazy. Plus, there's the whole obsession with Supergirl, too.
What about the Hulk? I mean doesnt he qualify for a big time personality disorder?! As far as I remember, Doc Samson once diagnosed something like that.
nice list but you forgot Creeper, Norman Osborn, Doc Ock, Mac Gargan, the Jackal, Gaggy, the Jokerz, the Mask, Bullseye, Kraven the Hunter, Super-Boy Prime, Lex Luthor
Prof X(went nuts and created Onslaught), Wolverine(no explanation needed), Bane (went nuts because of Venom), Carnage(no explanation needed), Hardball(turned to Penance), Scarlet Witch(surprised nobody said her yet), and Dr. Light(he's a serial rapist)