Tad and Tom bump into each other in a bank, both attempting to rob it at the same time. They come to the conclusion that they must be twins separated at birth, because they look exactly alike, and walk, talk, and shoot like bandits straight out of an old western. They head to Gotham together and work for a mobster, who nicknames them the Trigger Twins after some comics he read as a kid. Tad and Tom appeared in the unquestionably popular and memorable (but not very good, in my opinion) Knightfall storyline, and got their asses kicked by a monstrous, non-Bruce Wayne version of Batman while trying to rob a subway money train.
Pros: Knightfall was popular, so for minor villains, a lot of fans will remember them.
Cons: I like a good western, but two dudes with ten gallon hats and six guns running around shouting "yee-ha!" while they rob a Gotham Bank seems a little out of place.
How I'd do it: I want to say I'd ditch the Trigger name and the cowboy theme, but if you do that, no one would recognize them as the Trigger Twins.
Casting Guesses:Nathan Fillion and Thomas Jane. I don't know about twins, but they could pass for brothers. That's a lot of talent to waste on two crappy parts though.
Verdict: The Trigger Twins might say "in a pig's eye," or at least I think that means no way.
After The Scarecrow, Ra's Al Ghul, The Joker, and Two-Face, who should be Batman's next enemy in the Batman Begins/The Dark Knight series? Well, as of now we know that Tom Hardy will play Bane and Anne Hathaway will play Catwoman.
Check out the master list for all the villains covered. I've pretty much run out by now. Obviously, there are more Batman villains, but not any of significance that I know of. As of February 2009, no one is confirmed as a villain. Not the Johnny Depp Riddler, not Phillip Seymour Hoffman Penguin, nobody.