Comical/Secondary identities
Several heroes have, over their careers, passed through alternate identities, costumed or not, as a way to act without compromising their known costumed identities or for pure plot reasons.
I think it could be fun to revisit some of those weird/unknown/unpopular identities (I remember that Spider-man had multiple identities for some time, and it inspired me to this thread).
Lets see some alter egos!