[quote=VitaVitaAR]
@Dead Cruiser: I think you misunderstood, I wasn't suggesting an affinity for youkai as an idea, I was using it to say "Spirit" as an affinity is a bad idea. It would basically be an affinity dealing with an entire class of widely differing beings and I really have no idea how it would function when applied in the same way other affinities are. And there is actually onmyodo in this but I didn't think it was immediately relevant to the RP.And, well... there's really no "over-dimension" for spirits? ^^; There a different plane of existence but that won't conceivably be appearing in this RP. Ki in an of itself I never really considered to exist in this setting, I guess astral projection might be a thing, I'm not actually sure what the "aura" would be other than a mana signature that's possible to pick up on if you know what to do for this though.
[/quote]

Perhaps we can call it an "Ephemeral" Affinity, then. Purely dealing with normally incorporeal entities, such as specific spirits and ghosts, and their related phenomena.