Doesn't really matter since technically there are 2 Batmans but for reference.
Spider-Man-PB
Batman-Sakura
1960's Batman-Clef
Hawkeye-Fexni
Nick Fury-White Jet
Human Torch-Phi
Loki-Pyro
Dr. Doom-Wily II
Deadpool-TENK
Ahrzayl was also Scarlet Witch, Tron was Omega Man I think, and Suppercut was Iron Man but they really haven't posted much so those should be up for grasps if you really don't want to be the same hero, especially since I know you want to be Ironman so bad. I don't know if Supper would actually want to return someday, but 2 Ironmans shouldn't be a problem if they are different enough. Supper-Ironman only really used a blast that had 1/10 the force of a nuke and knocked Bat-Sakura off her butt.