I wish more alter egos were available via quest/key item/Story progress.

At points in the story it just seems appropriate for them to "join" the team. Extravaganza Egos should all be special such as Mob's and Iconic or Cameo Characters IMO.

It would be AWESOME if there was a reputation level for various NPC's with repeatable or chain quests that opened them for Alter Ego.
or a Whole Quest arc involving the recruitment of new Alter egos.