Please Paragon do this!
I always wanted Base NPC.
May I add to this suggestion.
Maybe we can have normal NPC to make bases lively using the Character Creator. Imagin how nice it would be having student heroes in a Academy themed sg
or maybe some magicians practicing some spells and chants.
Maybe even allow NPC's from enemy groups for enemy themed groups.
I've just thought for a long time that it would be totally cool if we could replace the soulless machinery/magic furniture in our bases with NPCs. You know, much as we can make custom NPCs for Mission Architect arcs. Maybe even let us buy things like stores and trainers for our base - I've always wanted the ability to put a trainer in my bases - as well as a possible alternative for storage tables, mission computer/pillars of ice and fire, and even teleporters.
I know these things are a bit outside of the game's ability right now, but hey, this is "For Fun" suggestions, so why not?
I suggest Supergroup NPC goodness
The Girl Your Mother Warned You About
Primary Virtue ~ Secondary Guardian