It seems the general consensus is that you'll be using personas representing the seven deadly sins.
Well that's a bit disappointing, seven deadly sins is now way too overused of a gimmick now, especially when represented half-assedly.
It was cool back with FMA and Se7en, but now everyone is just using them whenever they want some random gimmicks to assign to any group of 7 characters.
But well, given ATLUS's track records, I hope P5 actually use this gimmick well enough to be interesting.
Well, the main character's Persona is Arsene, based on the famous gentleman thief Arsene Lupin, as seen in post #1925071 so it kind of throws most mythologies out the window.