- Michael C. Hall
You may know him from: Dexter, Six Feet Under
His character on Dexter is a sociopath whose unnerving coldness while doing horrific things has earned him a lot of fans. That kind of thing could completely work for The Riddler.
- Denis Leary
You may know him from: Stand-up comedy, Rescue Me, The Ref
I forget where I saw it, but jotted his name down even though he's a terrible choice. I like him a lot as an actor, just not for this part at all.
- Daniel Day Lewis
You may know him from: Gangs of New York, There Will Be Blood, My Left Foot, Last of the Mohicans In The Name Of The Father
He is sometimes incredible, but sometimes overacts ridiculously, so much so that it won't even work in a comic book movie. Not that it matters, because I can't imagine him ever wanting to be in a Batman movie anyway.
- David Tennant (pictured)
You may know him from: Dr. Who, and what looks like a bunch of other UK TV series
I don't watch Dr. Who, so I'm not familiar with his work. He's a pretty popular choice among fans, though, and has expressed interest in the part. But from what I can tell, he almost certainly would go the Gorshin/Carrey route.
- Christopher Walken
You may know him from: The Dead Zone, Saturday Night Live appearances, Pulp Fiction, too many other roles to list
He's eccentric and can be unnerving when he's not playing it for laughs, but I can't imagine a Riddler who's pushing 70 years old.
The poll should be up within a minute, and will close in a week. Depending on my free time over the holidays, I may get another poll up next week, but it might be longer.