Yasaka

Yasaka is a nine-tailed fox and the mother of Kunou. She is an extremely powerful Youkai that is on par with an Ultimate-class Devil, and is the leader of the Youkai in Kyoto.

Appearance
Yasaka has a human form and a fox form. In her human form, she is a young woman with a voluptuous figure with golden blonde hair and matching eyes dressed in shrine maiden's clothing. In her real form, she is a giant nine-tailed fox with golden fur.

History
Not much is known about Yasaka, other than at some point before the arrival of Issei and the second-year students of Kuoh Academy, she was captured by the Hero Faction.

Plot
In Volume 9, she was captured by the Hero Faction under the intention of using her to open the Dragon Gate to summon the Great Red. She was rescued by the timely arrival of Son Goku and Yu-Long, who are backups called by Azazel to assist Issei and his friends. In Volume 12, Yasaka led her fellow Youkai to assist the Underworld in their crisis, easily disposing of the Bandersnatch.

Powers & Abilities
Yasaka is extremely powerful, and has been stated to be equal to an Ultimate Class Devil. She can take on Saji (in Dragon King Form) and Yu-Long, a Dragon King, at the same time and shows no sign of exhaustion. Her fox fire gives out a massive heat that Issei speculates is on par with Tannin.

Trivia

 * Yasaka's name means "Eight Grades".