Kurogitsune

Kurogitsune literally black fox is a feisty and excitable fox spirit usually found in the company of Yue. He can take either a fox or human form although he retains his ears and tail. As a resident of the temple Kurogitsunes role is to protect Yue. He clearly knows something about Yues past but casually deflects any questions. Unlike Yue Kurogitsune occasionally descends from the mountain into town alone. However he is not fond of humans only their food. Source: the manga habit