Workshop

Something like this. I tried to keep the roles themselves simpler, but still distinct from one another. I reworked an old Batman-themed Mafia idea. I really didn't like that, despite such a colossal gallery of awesome enemies, there were barely any of Bats' villains in that same Mafia game. Now it's fixed.
Since I decided to show off and use the characters' real names, this information might come in handy:

Jack Napier - Joker.
Harleen Quinzel - Harley Quinn.
Jonathan Crane - Scarecrow.
Hugo Strange - N/A
Pamela Isley - Poison Ivy.
Victor Fries - Mr. Freeze.
Ra's al Ghul - N/A
Matthew Hagen - Clayface.
Edward Nygma - Riddler.
Temple Fugate - Clock King.
Arnold Wesker - Ventriloquist.
Mary Louise Dahl - Baby Doll? I don't know how they adapted her into Russian.
Oswald Chesterfield Cobblepot - Penguin.
Jervis Tetch - Mad Hatter.
Kirk Langstrom - Man-Bat (no, it's not a joke, actually Man-Bat).
Maximilian Zeus - N/A
Garfield Lynns - Firefly.
Waylon "Morgan" Jones - Killer Croc.
Bane - N/A

Bruce Wayne - Batman.
Richard "Dick" Grayson - Nightwing, the first Robin.
Timothy "Tim" Drake - Robin, Red Robin, the second Robin (actually the third, but Jason Todd was skipped in DC Animated Universe).
Commissioner James Gordon - N/A
Barbara Gordon - Batgirl.
Alfred Pennyworth - N/A

Selina Kyle - Catwoman.

Harvey Dent - Two-Face.

Andrea Beaumont - Phantasm (alarm, spoiler for the feature film!).