Personas are usually a mythological figure matching your Arcana. In the games, the ones like Asmodeus and Satan are of the Devil, but you should also look up the Arcana's meaning and try and find a mythological figure that fits it.
You get bonus points, if it suits your character's personality or fate (Persona 3 has this in droves) as well.
Also Savo has formally dropped from this RP, so his character will now be NPC.
AND BY THE WAY.
If you have NPCs and want to assign them to classes, let me know, either here or PM.