I was thinking for the sake of inspiration and just for fun we could just write about simple concepts for hero/villain/vigilante/anti-hero/henchmen/sidekick/anti-villain groups
Government Funded Enforcers: A player group that could be a great deal like SHIELD or maybe even GI Joe.
Cults: Worshipers of Eldritch deities or maybe even run by a really charismatic evil leader or even a twist where it's a cult who worships some alien yet "good" deity and go off to hunt villains in order to sacrifice it to their god.
Criminal Organizations or Gangs: Be interesting to play as a Mafia Lord or even a gang of street punks that do a drive by and fight for territory.
They came from outer space!: Play as an alien empire from another planet, come to conquer, protect, or study the earth people!
That's all I got.
When life gives you lemons. SHOOT IT WITH LASERS!!!