As Adam said, he is a fox.

In KNT his name is
Koon-no-kami, and in Japanese
koon is a representation (onomatopoeia) of a sound that a fox makes (well, actually I never saw a fox, what kind of sound it makes?

). Koon-no-kami ends most of his speaking with 'o-koon'.
Besides, Al Dent in KNT is
Wankoo-no-kami, and
wan wan is the Japanese version of bow-wow.
Haha, I really didn't know that! Thanks so much for your explanation. I still don't understand why they made him a rat though, while he's clearly a fox.
