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.
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.
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:
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'.