I love it when Personas take over negotiations with demons. I'm
          trying to compile a list of all the Persona-demon encounters that
          will result in a dialogue. The latest one I found is Michael (Ellen's
          ultimate Persona) vs AL: Dominion (the most annoying, if not
          necessarily the most powerful angel in the game). I've tested
          everything on this list; if anybody has had any successful tries with
          other combinations, please e-mail me. ^_^
          
          Persona     demon
          
          Azrael (lv 36) vs AL: Virtue (lv 44)
          Bucho (lv 74) vs WM: Bufflax (lv 63) [will not result in a spell
          card]
          JackFrost (lv 10) vs FY: JackFrost (lv 8) or Jack O' (lv 15)
          Jack O' (lv 20) vs FY: Jack O' (lv 15) or JackFrost (lv 8)
          Jester (lv 59) vs FA: Jester (lv 56)
          Loki (lv 51) vs WM: Fenril (lv 75)
          Michael (62) vs AL: Dominion (lv 52)
          Nike (lv 7) vs AL: Angel (lv 14)
          Pixie (lv 5) vs FY: Pixie (lv 2)
          Remy (lv 21) vs ND: Remy (lv 19)
          Shiva (lv 96) vs SD: Ganesha (lv 65)
          Succubus (lv 53) vs ND: Succubus (lv 51)
          Viper (lv 50) vs DN: Viper (lv 50)
          
          A couple more notes on getting Personas to talk to demons:
          
          1) You must talk to the appropriate demon as soon as you
          encounter it - you can't fight a few rounds and then talk, or the
          Persona won't take over. This means you can't Persona Change in
          battle first, so be sure that the Persona you want to start talking is
          already active.
          
          2) You must have at least one empty slot in your roster of spell
          cards for this trick to work. If you're carrying the maximum
          amount of spell cards, your Persona won't talk to the demon. Use
          the delete command to keep at least one slot open in your spell card
          list. The good news is, moon phase seems to have no effect on this
          trick.
          
          3) If the trick works, the Persona will take over as soon as you
          select its host to contact the appropriate demon - if you just get
          your char's anime-style profile and his/her four contact options, the
          trick hasn't worked. The advantage is that you can try this trick out
          without actually risking the drawbacks of a failed negotiation (if it
          doesn't work, just cancel the negotiation and go back to fighting -
          whereas if you start an ordinary conversation with a demon, you
          have to keep talking until the negotiation has swung one way or
          another).
          
          4) If a demon offers your Persona its spell card, you have a choice
          to accept or refuse. The demon and Persona will say something
          different depending on which choice you make. If your party is too
          weak (i.e. low-level) overall to accept the demon's spell card, the
          demons won't give you their card; instead, they'll comment on how
          pathetic you are.
          
          5) When I did this with Loki vs Fenril, Fenril contacted me first,
          and gave my party a spell card even though I'm sure we were all below
          its level (we were in the low 70s, and it's level 75). But when I did
          it with Viper vs Viper, the Viper demon wouldn't give up its spell
          card until my party was of a high enough level (they just talked,
          commented on how weak we were, and ran away). So I'm guessing
          that on average, your party needs to be of a high enough level in
          order to get a spell card off the appropriate demons, even with this
          trick.
          
          6) Generally speaking, the level of the Persona tends to correspond
          with the level of the demon it talks to: high-level Personas talk to
          high-level demons, while low-level Personas talk to low-level
          demons.
          
          7) I've had suspicions about other Persona-demon combinations.
          Please do e-mail me (vctr113062@aol.com) if you have a
          successful Persona-demon conversation not on this list! In
          particular, I would love to know if Persona Alfred can talk to any
          demons... ^_^ 
          
          Victar, DNRC Minister of Obsessive-Compulsive RPG Addiction
                 Bard's Tale I-III * Might & Magic I - Swords of XEEN 
             Dragon Wars * Swords & Serpents * Shining in the Darkness 
          Arcana * Don't Go Alone * Drakkhen * Final Fantasy NES - Mystic Quest 
            Beyond the Beyond * Persona * Wild Arms * Dragon Warrior I
                      (http://members.aol.com/sglkht)