What a coincidence - I'm also going with 4 for the oriental coven. I think it's a good number of characters to work with, not too many to make things over-complicated, and not too few to feel lacking.

Guess we do share similar mind image of the location. Awesome - this makes the setting part pretty much finalized (except for the town name, but that can be decided when we work in CS so it's ok).

I'm hoping we're playing the other members of both covens as NPCs, and we largely focus on our respective main OCs.

Plot wise the generic one we had so far should be enough to work on for now, since this RP would be more character-driven.