I looked up the prefix -nin in japanese and it can mean endurance, perseverance, and forbearance in both the physical and mental realms. It is also a prefix in jinja and ninjitsu. this leaves me to believe that this could possible be a fighting type...despite it not looking like one. And there is most likely not going to be the stupid light type that everyone thinks it is because it would screw up the balance of all the elements, so ninfia being a new type is most likely out of the question. they haven't made a new type since generation 2 so i don't think they're going to introduce one anytime soon.