What Okki actually looks like when Tamamo isn't bullying her to have a different look just because she is already annoyed about Suzuka sticking fox ears and a fox tail on herself.

warellis said in comment #2622904:

What Okki actually looks like when Tamamo isn't bullying her to have a different look just because she is already annoyed about Suzuka sticking fox ears and a fox tail on herself.

Turns out it's her sister, Kamehime.