I actually created a Persona -trinity soul- based roleplay (completely different plot, though, filled with horoscopes and sexy plot twists), but I don't plan on actually posting it anytime soon. I'd have no problem helping you come up with one, though I'm not sure I'd be able to help GM it depending on when it starts.
:D thanks. I've been trying to contact you for ages XD. I noticed your Vices and Virtues RP and it reminded me of persona and I learned you were a persona fan (I think). Would you like to collaborate in making a Persona Rp with me? Or at least help with the conception?