Riddler

I am trying to think about who Christopher Nolan's Riddler would be. Not the actor, but the character. I like the idea of a super smart villain who is obsessed with the idea of being smarter and more cunning then Batman. He is a villain because he is trying to show he is better. If I was rebooting the Batman comic, I would make the Riddler someone who starts off as a hero helping Batman, but turns out to be a villain. I like the idea of someone who keeps on switching from good to evil because it is a challenge to do so.