Mr. Freeze- Ed Harris
That icy stare, the creepy voice, the broken heart. Ed Harris is just plain awesome, see him make Freeze even more awesome.
Clayface- Steve Buscemi
I want this to be the Basil Karlo version. Make him this unattractive horrible actor before he gets the powers and that would be Buscemi to a tee. Now imagine his voice coming out of a pile of mud and you have yourself Batman's personal monster.
Black Mask- Adam Baldwin
Have a badass play a badass. Baldwin's got the chops and the cajones to play the ultra tough mob boss of Gotham City. Until he gets shot in the head by Catwoman.
Bane- Dwayne The Rock Johnson
What people forget about Bane is that he's probably Batman's smartest enemy. By all means he should be Batman's greatest enemy but he gets cocky. Have the Rock bring his stage prescence, hidden intellegence and physique to play the mercenary.
Dr. Harleen Quinzel- Rose McGowan
Porceline skin, bubbly personality and a kickass other side, Harley Quinn shouldn't be the Joker's lacky but she is. McGowan can play her mixture of sexy and crazy.
Dr. Jeremiah Arkham- John Turturro
I'd like to think that Arkham's demented enough to think that he can cure the Joker, Poison Ivy, etc. He wouldn't be a raving lunatic like Turturro sometimes is, but I could see Arkham snapping after a massive breakout of the Asylum. A trait Tutturro is excellent at.
Crispus Allen- Dennis Haysbert
Haysbert plays a tough cool guy on the Unit. I think he can bring Allen to life in flashbacks with him and Montoya. All I have to say is picture his voice coming out of the Spectre.
These next two would be used for Batman several years down the road. Possibly in a Dark Night Returns esque movie
Batgirl/Oracle- Blake Lively
I'm thinking that Batgirl should be a cautionary tale. She's the young 18 year old daughter of Gordon who decides to be a hero like the Batman. But on her first night out she gets two bullets in the spine from the Joker. She then becomes an information broker to Batman. Lively might have valley girl looks, but she had the kind of intellegence in her roles that would fit this part.
Nightwing- Milo Ventimiglia
If you have Dick Grayson in a Batman movie, make him Nightwing. Since this would be Batman several years later, you don't have to show him in the Robin suit but in the Nightwing garb, allude to Robin like a costume in the Batcave. Nightwing is the bright light in Batman's life, but he has a tough quality about him. Milo Ventimiglia has said his dream role is Nightwing, and he certanly has the experience in the comic book genre, I say he's our Nightwing.
Well that was hard.