seeing as its the last (nolan) film,ide like a break in the formula,so that something genuinely earth-shattering could happen. i honestly dont see that much potential in the favourites to be picked.
Bane - Well,theres some potential here,going on the knightfall story (i know youve already discussed this indepth,but i think interpreting banes rise and fall could make an interesting script.unfortunately,bane doesnt adapt well unless hes massively changed.no wrestling suits,please.also,part of the success of the knightfall story was a) batman loses
b) the chance to see a replacement in action
i dont think theres time enough in one film to flesh out those successes and so my "earthshattering" wish probably couldnt be fulfilled.
Black Mask - interesting choice,but not as a main villain,he wouldnt have the box office draw,he lacks depth and he'd more likely be stepping into sal and carmines shoes. a maybe.
Catwoman - ick.never liked her,although i gather shes a very popular choice.as a secondry villain,perhaps,and i know she has the mass market appeal (not as much as the macabre thrill-lets be honest here-added to the chilling performance of ledger as the joker,but more than everyone else listed here except perhaps the riddler) but i dont find her character interesting having grown up with the flimsy performance of michelle pfeiffer in BR.
Clayface - i imagine nolan himself wouldnt choose this one,quite far out and similar enough to spiderman 3's sandman.
Deadshot - an interesting choice for a second or third villain,but i imagine he'd have to be adapted (get rid of the suit for a start)
Doctor Phosphorous - i cant see it.clunky name,no mass market appeal and out of the fantasy side of the rogues gallery
Firefly - possible,but once again as a second or third villain.would liven up the action
scenes.
Harley Quinn - touted strongly in some camps,i wouldnt say shes a strong contender but i can see the reasoning.
Hugo Strange - personally i would be disappointed if he were chosen as the main villain having seen Ra's and the Joker as the first 2 films primary antagonists. a contender certainly,but i cant imagine warner brothers being to happy having to use him to try to emulate TDK's box office record
Hush - again,not a big league hitter but i prefer him as a choice to Dr Strange. it would be a bit of a surprise if he was chosen.
Killer Croc - again, too far into the world of fantasy that nolan has attempted to avoid.
The Mad Hatter - most likely not a candidate,all things considered. hes not hugely popular, i dont imagine he'd work as a secondary villain, and he has similarities to villains already shouted down (a re-cast joker,the riddler)
Man-Bat - see croc. though i would like to see him make it to the screen eventually,he has potential- the first batman TAS episode with him in it was superb.
Mr. Freeze - ruled out
The Penguin - perhaps as a mob boss as other people have suggested, though nolans dislike of him probably rules him out too
Poison Ivy - hopefully not. uma thurman cremated the character in B&R, and she was playing her close(ish) to how the character acts in the comics.
The Riddler - ruled out.
The Ventriloquist and Scarface - i really,really dont see it.christian bale fighting a guy with an uzi-carrying puppet? not while the man that directed insomnia and memento is in charge.
so if you managed to get through that, you might notice i really am not too gone on any of the characters above. hence, i would love azrael, nightwing or robin to be involved on an antagonistic level.robin probably wouldnt work,and that probably rules out nightwing too,but under the red hood and the dark knight strikes again both hit upon the idea of bruces protegés turning on him,something i would love to see.failing that,i think azrael,harvey bullock and one of the more famous choices ive gone through above (perhaps with sal maroni or rupert thorne involved mob-wise) would make for a powerful conclusion to nolans trilogy,especially if the script is written with an anything goes philosophy.