Existing Characters by Codename
If you're trying to determine whether a character name is taken, your best bet is to log in and try to 'find <name>' or '+finger <name>'; some chars exist on the game under their codename rather than given name.
Characters by First Name
Characters by Last Name
Actor List
Angel
Anole
Bast
Fire Hazard
Ghostflower
Green Goblin
Medic
MUTE / Trouble Magnet
Talkback
Rogue
Phantasm
Wolverine