Persona is a video game series that combines the elements of role-playing games and sim games. The player takes control of a character that manifests their 'persona' which is an avatar represented by one of the cards of a tarot deck (usually it also has some sort of mythos). This persona is used to combat shadows, usually in the other world or the dark hour (depends on the game, I won't get into it). The actual conflict is dependant on the game, and a bit vague, so I'll leave that to someone else.
All characters have one persona. The exception to this is the main character who has access to a place called the velvet room, where he can create a new persona by mixing and matching various personas acquired/made. He may then choose an assortment of personas to draw from at any given time.
Our characters, in this rp, I think would be like the side characters (all except one maybe). They would have one arcana card represent themselves, something relevant to who they are, and one persona. The persona would start off in its regular form, and then change after the character overcame a major obstacle in their life (usually relevant to their arcana card). Again, this changes in certain games so, a bit hard to explain.
Personally, I'm hoping we follow along the structure of Persona 4 but maybe with the foundations of 3. After that we can develop/make changes as needed since this is a custom RP. Thought/etc.?
edit - Actually I think the main character might have been the fool. Not sure, I may be off it's been awhile. The only reason I haven't played it more is because my cd broke :/.