Nolan has already said he considers The Penguin too “silly” a character to use. We can probably be sure then that Riddler, Mr. Freeze, Killer Croc, Clayface and that group fit in to the “too silly” group as well, as Penguin is the scariest of all those.
I think the only other one that can have the psychological impact that Joker and Two-Face have is Ventriloquist/Scarface…but he is not nearly well known enough.
Maybe Ra’s al Ghul can be brought back…along side Talia al Ghul. Now that, my friends, could be something.
I don't think Penguin really has the chops to carry a film. I watched Batman Returns for the first time in ages last night, and Devito's character just came off as more silly than menacing to me. Running for mayor (which is a very Penguinish thing to do, so it's a weakness of the character to some extent), running around with umbrellas...it kinda works in small doses, but it wears thin over the course of a movie IMO.
Clayface...too weird/sci-fi. He's more in the mold of a Spider-Man villain in my mind.
Croc...better as a backup thug than a starring baddie. Just not a lot to work with there for a 2-hour film.
Riddler is tricky. Jim Carrey sorta took him back to the manic Frank Gorshin portrayal, when I thought the animated version was already a big improvement on the "crazy" Riddler that came before (and with Carrey, after). I think the more subdued interpretation would work well on the big screen, but he'd need to be a back-up villain.
I definitely wouldn't automatically consign Mr. Freeze to the silly category, though. Yes, Ahnold butchered that character, but the animated Mr. Freeze is absolutely one of the most compelling, textured bad guys I've ever seen, so it can be done. (Can you tell I tend to think the animated series nailed every character?) :lol:
Never cared much for Ventriloquist, but I'll give anything a chance if it comes from this same crew.