Metroidvania
People called Romanes they go the house?
Do you guys at high levels (50+) use more than one persona in battle or do you just keep one super powered persona?
On normal or lower you're good with one or two personas carrying whatever element(s) skill your party doesn't already have. As long as you're keeping up with S.Links, forming 1-2 strong persona per dungeon should probably be able to carry you through.
Above that, I've been using one for auto-start buffs, one for debuffs while my party pounds on shadows, and then a strong finisher with the one element my party doesn't already have if needed. Spreading experience around gets to be pretty tricky with more than 2-3 though. Also end up making more specific persona for boss fights.