PERFECT Casting for The Riddler in a Batman movie.
Sharlto is a brilliant actor, but I look at him in the height of comic book films, specifically the Batman series, and I think he'd be such a brilliant Riddler if they ever decided to portray him.
I'd love to see him as a mix of the classic Riddler and the one from the Arkham games where the Riddler uses "SAW" like tactics to test Batman. It'd be brilliant!