In terms of actual game development, my summer just started and I have RPG Maker VX Ace but I'm not particularly skilled with it, so I'd stick to discussion and creation of characters/item/equipment/basic scripts etc. I mean I am definitely not enough on my own so better find someone or else I'll have to suddenly cram tutorial videos into my schedule.
That being said, it'd be a love letter to both Persona and this forum, so let's have fun with compiling ideas.
Basing the game around one central area may actually be apt given the Persona games (at least 2IS and 3-5) follow the format. In that case, featuring this forum's version of Boss as an owner of LeBlanc would work well and honor him as a recognized member of the community with a part in the community.