well NPCs can be cannon controled by normal users or natural characters found on anyone of the themes which are controlled by staff, or something totally made up to be used as a hunting target or a ally as in a edolon found in final fantasy XIII in which one can be tamed by defeating such a being then the control gos to the user who tamed it which also gos to the 2 storys drakengard and eragon, the Forgotten Realms which is D&D RPG in general, ....
what do ya all think?