Since we are here I though it would be best to list the ones currently existing for ease of any new users:

• !fireemblem@lemmy.world - General Fire Emblem
• !shitpostemblem@lemmy.fromshado.ws - Good ol’ Shitpost Emblem
• !fireemblemheroes@lemmy.fromshado.ws - Heroes (I will personally post some datamines and builder updates here too)
• !fireemblemcats@lemmy.ml - Fire Emblem… cat girls?
• !kagasaga@lemmy.ml - Vestaria and Berwick games

Generally speaking I would suggest if creating new ones to avoid very big instances, since those are currently a bit overloaded and struggling to get the content across to other instances. Prime instance of this is lemmy.ml where it can take multiple hours if ever for content to catch up.

You can use https://lemmyverse.net/communities to scout for new ones communities of your interest