Crazy Quilt, dammit!
You see the man for a grand total of four minutes. He is a villian in the film, but honestly it works well in Nolan's attempt to show more "Radical" criminal elements in Gotham now the Joker has set the example for all up and coming gang members. Quilt is a small time criminal who was part of Gambol's former gang. He went by the name of Crazy, simply cause he like dto get drunk and do stupid things. These things amused Gambol and so he had a secure postion. Now with Gotham's underworld in chaos Crazy tried to step up his game. He wrote a many page letter to the press speaking his status, and power and how he wanted millions of dollars or a bomb would explode in a school. There was no bomb, but Crazy hoped to make some quick cash. What instead happened was a postage stamp, a security camera, and a credit card leading Batman right to Crazy. The press made the man a joke by focusing on a single line in his letter, "I will be the man who unifies the Gotham Underworld, like some Crazy Quilt." Now he sits in prison being made fun of by the criminals. I see that kid Mclovin as this guy for somereason. He need to look like nothing important.
Black Mask, Riddler, (and shes sometimes a villain)Catwoman.
Catwoman is the anti-Batman. She is rich, and does her crimes for fun. It started by stealing from men she slept with, but soon it moved to more daring things. She does not use a grappling hook and zip across gotham, no she moves along roof tops, down fireescapes, and uses an unmarked car. However she starts to take a great interest in the Batman, and not only that she fixates on him. So she changes her MO a little and starts to wear a uniform, not too revealing, but it is designed to show off her curves rather then protect her. She becomes a rather "popular" criminal, she steals only small things and while women are furious, men feel an odd sense of pride over being a victim.
Riddler is the name of a very odd hacker who once moved around funds for the crime families of Gotham. He has massive OCD, but he found through therapy a way to control it not by movements but by words. He says Riddles, he constantly leaves clues for everything he does. With his access to mafia funds, and said mobsters going to prison or worse the Riddler is bored. He decides to find out who the Batman is. He may have already done it, he is jsut waiting for the right person to tell. Johnny Depp? Seems too much like a leading man for this, but he has that level of wierdness that works.
Blackmask may be a single person. Then again he may be various mobsters who have learned the value of staying secret. He is only seen behind a television screen with his face blacked out. To this man crime is a business, and for his busniess to work the Batman has to be gotten rid off. While just a voice, Bob Hoskins fits the bill as a villian, and as the voice for such a guy.