User with this ability either is or can transform into an kitsune (Japanese: fox), a fox-spirit, who usually gain their powers by living long and keep growing stronger as they age: the more tails a kitsune has (they may have as many as nine) the older, wiser, and more powerful it is. They are often tricksters, with motives that vary from mischief to malevolence, but some act as faithful guardians, friends, lovers, and even wives.