Would there be any legal backlash if we were to set up a database for NPCS, Maps, etc?

I think if they are your own creations there shouldn't be a problem but using NPCs created by Catalyst might be a problem. Though maybe not as you can sort of find such a listing on the Shadowrun Wiki.

THUGS!
Vehicles, Drones, and Agents (not really but I have a couple things in there)
Archetypes
Drone Sweet Drone
Lastly, I would not be against thred-o-mancy reviving this thread: Retired runners