... I was thinking more on the line of...
focus more on Fan representative 'stereotypes' characters and have NPC as guest appearance...

So, say official finally have comic, it won't clash so much.
Besides, having reading story from different perspective provides more variety?
Official focus on NPC.
Fan focus on exploring Menewsha.

Unless it is in a fancomic to the point of regardless of what NPC characters are, it is just fanwork.
I find that it could be confusing... *shruggs*

I represent my own interest that I do not really love NPC that much. I always like setting/background/place more than the people.