Everybody has a shadow? So would the "boss-type enemies" be the protagonists' shadows? Also, would the RP focus on the training itself in the academy, or after graduation, fighting shadows on a regular basis?

And, just to clarify, the demons will be playing an assissting role, as the Summoner's lackeys and the Avatar's inspiration. Nothing else from them?

One more thing: Guns are totally an option for combat, right?