Just read the Oni, I think this is a great addition to the game.  Well Done! 

I saw the other ones you are working on too, the Tengu and the Kitsune. I don't know if another fae creature really improves that game much... a kitsune can already be played as a fae.  I was thinking about suggesting a Kitsune-mochi or a Tsukimono-suji as an alternative... but both of those archetypes can already be played as an infernal. 

A Kitsunetsuki would be an interesting skin, a semi-possessed person who is trying to just be a normal kid in highschool would be very fun to play, and one that currently can't be made with the ones that are out there.