Searches here and elsewhere has convinced me that while kitsune do exist, there's no baseline mechanics for creating PCs or NPCs. I am hoping I am wrong, as one of my players has her heart set on a kitsune character. If there is no official documentation, I would be grateful for any shared homebrew.
Conversely, if there is a good reason why kitsune are not made available as player characters, I'd be delighted to know. I would assume that such a character would be rather distracting from the usual theme, but there are the ratlings and naga races that give me pause. Is it simply because the kitsune's nature make them too restrictive for good playing? That is the reason I'm currently giving my player.
I found this to be helpful, but not complete enough.
Best Answer
In Enemies of the Empire, starting on p244 there are rules for "Shapeshifters" and "Child of Chikashudo" advantage. On 246 they have a sample Kitsune so you know which shapeshifter powers/aspects are typical for the race. The option is more general because there's so much history in other books for what was once a minor clan, and because so many other creatures fall under the same category.