Christopher Nolan did such a masterful job making something unrealistic seem believable in The Dark Knight Trilogy that "nolanizing" is now a term. He nolanized Batman, Joker, The League of Shadows, the al Ghuls, and Two Face. More impressively he nolanized Bane and Scarecrow. However, Batman didn't face some of the antagonists we're used to, or fight along side some of the allies we're used to. Here is my list of five characters that I would have liked to seen nolanized.
5. HARLEY QUINN
Harley Quinn is Joker's accomplis/girlfriend/sidekick. She would need to be featured in a movie with Joker for her to work. She would be higher on the list if Heath Ledger(RIP) was still available to play Joker. On the other hand, Ledger's Joker doesn't seem like the type to fall in love(remember he threw Rachel Daas, the only attractive girl in the movie, out a window). He also doesn't seem like the type to have a sidekick. Still it would have been neat to see how Nolan dealt with Harley on the big screen.
4. ROBIN
I already know people are going to comment on this. John Blake never became the superhero we know as Robin. He was a cop whose real name is Robin who appears to inherit Bruce Wayne's goodies, but he was never Robin. He may have even been as close as Nolan was ever going to get to Robin. I would have liked to have seen a Robin. It would be a minor whole in the story since at the beginning of TDK, Wayne makes it very clear he doesn't want any copycats, let alone a child copycat. Despite this I want to see what a nolanized Robin would have been.
3. PENGUIN
The Penguin may be the easiest to nolanize out of the five. The Tim Burton Penguin, above, is not the comic Penguin. The real Penguin is a weapons dealer turned mob leader. He can fit perfectly in the scheme of things in Gotham. Still the physical appearance and personality created by Nolan would have been interesting to see.
2. THE RIDDLER
The Riddler is one of the more unique villans of all time. The key to him would be the riddles. They would have to be tricky and take time for Batman to solve. Also, The Riddler shouldn't wear question mark pajamas. I think a suit with a hat with a green question mark would be good. I'm not sure if he should have on a mask or not. It would be cool if he wasn't even seen until the end of the movie. He just left riddles either on paper or over the phone.
1. HUGO STRANGE
Hugo Strange was the first person to learn of Batman's identity. This could have led to an intense movie. There's not much to say about Strange and he's unknown enough for Nolan to really take full advantage of him.
In conclusion, I'm glad The Dark Knight Trilogy ended on a high note. Too often today do movie franchises keep cranking out sequels until a flop, even though there are remaining villans good enough to make a solid plot. Please note I left out Mr. Freeze and Poison Ivy because they're virtually impossible to make realistic.