His name is Shiraku.

An eight-tailed fox spirit.

He has the appearance of a human boy, but his age is in the four digits.
First-person pronoun: "boku" (I).
Second-person pronoun: refers to you as you, and to anyone other than you as "human."
He speaks with endings like "dakara na," "no ja," and "~no ka."
He likes all kinds of food.
Pure-hearted.

Tsundere.

He holds a fairly high position in the youkai world.