[RustyCage]

Sympathetic:
Mr. Freeze
Mad Hatter
Killer Croc
Clayface
Harley Quinn
Man-Bat
Riddler
Two-Face
Red Hood
Phantasm
Catwoman
Penguin

Unsympathetic:
Scarecrow
Hush
Hugo Strange
Zsasz
Black Mask
Court of Owls

Variable from story to story:
Ra's al Ghul
Poison Ivy
Joker
Bane

Left out the ones I don't know enough about to make a solid call. Deadshot, for example. Will eventually rectify that.

I hear he's in Catwoman: When in Rome, which I'm gonna pick up shortly. Didn't think much of him in Gotham Knights though...