I'd prefer the Penguin
be a short fat guy who likes nice suits. No funky hands or bird fetish. Yeah they call Cobblepott "the Penguin", but he doesn't like it all that much.
is easy. She's a catburgler with a nice assortment of gadgets. ( Some stolen WayneTech?) Wasnt the character called the Cat when she first appeared? Seems to me her being female and a burgler is enough for the audience to make the Catwoman connection. Maybe toss in a pet cat to be sure.
The character is a chance for Nolan's Batman to show he's the World's Greatest Detective and not a just Gadget Ninja. Make the Riddler an arrogant so and so who likes to taunt the police ( and Batman) with clues. Not a nutter or a second rate Joker, but a guy who's every bit as smart as Batman. We'd need a second villain to do the "heavy lifting".
More of a psychological villain than a psycho. I've always like the Englehart & Rogers storyline from the 70s over what came later. Might be some good source material there.
The actor turned assassin angle mentioned by others sounds good. Washed up actors gotta work too.
A few fun angles could be played out. Karlo disguising himself as the Joker or Two-face. Or Him being Fox or Gordon through out the film but Batman and we aren't aware till the end. ( but with clues planted ala Sixth Sense
In his first appearence he was a rival of Batman and Bruce Wayne. A millionaire turned vigilante. ( though the vigilante angle was a ruse) With Batman on the outs with GCPD, Lawton stepping in would be a good angle.
Cant see this one at all.
Another one thats too "super" to be a Nolan villain without a major overhaul.
I agree he's good as muscle. Just keep him closer to his original look ( dude with bad skin) rather than the Lizardman look.
. I dont think she works without there being a "Mister J" around. Also, the distaff Joker doesnt really work with the Nolan Joker.
. Not seeing it. The hat and Alice in Wonderland obsessions just dont fly. Though maybe if Johhny Depp is available.