It's hard to tell at this point, in my opinion we need more active general communities before becoming too specific. It's been a little overwhelming seeing the fragmentation of communities across instances here on Lemmy. Hopefully something happens to improve the experience, I'm liking being involved so far though!
Using these as some sort of "flair" would be best.
While there's always a place for more specific fandom communities (ex: Zelda, Pikmin, Mario Kart, etc) the other communities can feed nicely under the umbrella of just "Nintendo"