Let's get the obvious out of the way. Some will have descriptions on why:
Batman- Kodoku. He tends to fight for reason and justice and awesomeness. Nothing more needs to be said.

Two-Face- Dobagoh. He has multiple sides and is studying law.

Penguin- My Face Is OP. OP's persona was obsessed with material things, same as Penguin.

Riddler- Campir. He thinks he's clever.

Poison Ivy- Kohana. Environmentalism.....nothing more really needs to be said.

Catwoman- Amber. She's got a caring quality for those she loves and is a sexy badass.

Hugo Strange- Smoking Joe. Joe always was an armchair psychologist.

Ra's Al Ghul- Elan. Elan seemed to mean good things sometimes...but went about them in not so great ways.

Talia Al Ghul- Scarlena.

Deadshot- Kon

Mad Hatter- Powerstoned. Smart and has an odd obsession with women. The obsession is different from Hatter though.

Joker- Nibalung/Scootaloo He's a funny guy.

Harley- CatchAndKiss

James Gordon- Fujiou

Barbara Gordon- Hippo

Killer Croc- Mere

Joe Chill- Ssraeshza. It's the only obvious choice.

Clayface- S Gang. Clayface section was either going to be Basil or all the Clayfaces. If all Clayfaces, S Gang. If just Basil, undecided.

Mr. Freeze- Jacob.

Hush- Chicago. But this is kind of an 'eh' fit. If I bothered with it more I'm sure an actual good fit would come along.

Maxie Zeus- The Moderator.

Characters I'm still trying to think of:
Scarecrow.
Black Mask.
Bane
Robin
Zsasz
Nightwing
Solomon Grundy
The Ventriloquist/Scarface

They really aren't enough female characters for this series. I still need to place BD and I'm not placing myself.

If you have any thoughts, share em'.

<--Iz better Harley Quinn OuO

I could easily be generic thug...I'd like to suggest the word 'FWHOMP!' floating in the action bubble above my head after I get punched...

Amazingly accurate!

strayyyyyya

However, I would never become the scum of the earth, i.e., a prosecutor.

Fuji and Hippo sitting in a tree! K I S S I N G!

apparently i don't know much about batman

Why am I Barbara Gordon? Don't worry, I think she's a cutie and I love her...

But why?