Fan Casting The Riddler in The Dark Knight

Edward Nashton, who later changed his name to Edward Nigma, is the super-villain known as the Riddler. His signature gimmick is committing high-profile crimes, and giving clues or hints to law enforcement. This has made him an enemy of the Batman in Gotham City. The riddles are a compulsive obsession to prove he is smarter than others, and this has made him an occasional patient in Arkham Asylum.