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Backstory: Aside from Joker, the Penguin, Two-Face and Catwoman, the Riddler is one of Batman's most famous villains. He's appeared in every adaptation of the character since the 1960s TV series and already made it to the big screen once before in Joel Schumacher's semi-reviled "Batman Forever" with Jim Carrey hamming it up in the role.
Why we want to see him: Because the Schumacher films took Batman into a bland, big studio blockbuster world of bright colors and little substance. The gritty Nolan-ized Riddler could revamp his image (and let him wear something than that ghastly green unitard Carrey wore in the 2005 film.)
Casting suggestions: The fanboy world is abuzz with rumors that current Dr. Who, David Tennant, may be interested in the role.