Alright, I have another idea I've been sitting on for awhile and it could be of benefit to this game.
What if we allowed people to play whole teams?
Like, the entire Justice League, or the Teen Titans, or a villain team. They could be the JL while other players played the characters, doing their own stories. Anytime someone wanted to bring together a PC Justice League, the person playing the Justice League would take a break and let the group do their arc. And, it could be open to interaction with the team interacting with PC villains and other individual heroes and teams.
Think of it like the comics. How Superman and Batman have their own books and have adventures, but their also on the JLA and their having JLA adventures. It's the same basic principle as the comics.
It's just an initial idea and could be toyed with. But it's a new way to take things and something that we've never done before.