Is there a discord or more information on the NPC's?
No, not that I'm aware of. Though someone once mentioned making a wiki with information, I can't find it, so it might be region locked somewhere.
Anyway, what information are you looking for, specifically? I happen to know all the NPC's descriptions, personalities, and relationships. Schedules/routines I don't know and don't care much about.
I don't think I should be disclosing NPC physical or character descriptions since they are encrypted now.
Personality tags are easy enough to find that anyone can do it at the moment if they know where to look which I go over here: https://itch.io/post/16085172
I feel like some form of wiki or just one of these little discussion pages for in-game stuff about the characters would be neat. And with the new custom thing up, a place people could share characters they made would be amazing, with how incredibly slow it is to make models and the world sprites using free services.