Mine is Bane
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For me, it's the Riddler. I know a lot of people think he's lame and stupid and whatnot, but I like his more cerebral approach to villainy, I think he makes for a better "trickster" villain than the Joker does... and there's just something about that stylish green suit and bowler hat.
Oh, the Joker has his moments, but to be honest I'm kind of sick of him, and he hasn't actually been funny for years.1