Eevee evolutions have always single-type, usually an "elemental" type (fire, water, electric) and not a "creature" type (bug, flying, dragon). I'd say we'd be most likely to see a Ground or Rock type, but Ninfia looks vaguely Normal. I'm not a huge fan of the Normal-type due to a lack of super-effective STABS (Ghost immunity is useful, though). --- Whenever it's foggy out, I imagine my vision is being restricted to 3 squares. If only I brought a torch with me.