Mmmh... What's the tone of the campaign? Are you the choose one (wild card in personal 3-5, the Fiend in SMT Nocturne) or an unlucky desperate soul like in Personal 1/2 or Digital Devil Saga or SMT5. If you are playing it as an horror with high lethality, I suggest a system like Dread or CoC, if it's more about the story either Gumshoe or Hillfolk, or Cthuluh Dark, for pure action Savage Worlds, or 2d20, or the system from Shadow of the Demon Lord. If you want a thematic persona game, the Italian Sine Require that use Tarots as the main résolution mechanics. if you are just looking for a fast way, use the D20 modern and make the daemon/masks as artifacts or magic you need to set up every day (like a magic book or a prayer in DnD)