Yako

Yako (ヤコ) is a supernatural haunting a set of stairs at Kamome Academy. She is the current representative of the 2nd School Mystery, The Misaki Stairs.

Appearance
Yako first appears as a beautiful woman with long beige hair worn tied with a red and white ribbon with small bells, reminiscent of fox ears. Her eyes are the same shade of beige. She wears a patterned kimono with a white outer gown and white gloves.

Her real form is a small white fox with a purple bib tied around her neck. She has bell earrings, similar to the ribbon in her human form. In the past, she was an inari statue in front of a temple gate, presumably near Misaki's schoolhouse.

Personality
Yako is prideful supernatural who thinks little of humans other than her late Misaki. She was willing to do anything to bring him back. She has little understanding of human and their anatomy. As such, she employed the students' help to rebuild Misaki's body and had no qualms with removing them if the body is inadequate.

Later she admits while her rumor was altered by Tsukasa, she retained full control of her actions. She describes it as a side of her she often kept bottled up, but now dragged out by force.

She prefers to be treated with respect, asking others to call her by her name instead of calling her Fox. In moments of vulnerability, she lashes out by biting others or verbally berating them. However, she still has somewhat of a soft side, as seen with how she comforted Kou after hearing about the incident with Mitsuba, and even allowing him to call her nee-san.

Hanako
Hanako as the School Mystery Number 7 has command over Yako as a leader. Yako makes little attempt to listen to his requests, only agreeing to help after Hanako threatens to make her into kitsune udon.

Tsuchigomori
Tsuchigomori and Yako have been shown bickering ever since his introduction as supernatural. He derogatorily calls her "stupid fox" or "echinococcus" while being addressed as "emo spider" as well as getting bitten by her in her fox form. Despite their constant quarrelling, they both are shown regularly interacting with each other in contrast to the rest of the seven school mysteries who keep to themselves.

Transformation
Yako is able to shapeshift between her human and fox forms at will. Though her true form is of the fox and it is the one she assumes outside of her own boundary.

Number 2's Powers
As the School Mystery Number 2, Yako has command over the Misaki Stairs - her boundary. It can be accessed by stepping on the fourth step of the stairs.

In the boundary, Yako is unbeatable and other School Mysteries are not able to use their own powers unless permitted by her. Her weapon of choice is a giant pair of hair shears. If one were to get clipped by them, their body will turn into a doll. Additionally, Yako has small kokeshi dolls she can control to perform tasks. The dolls are often used to restrain her subjects while the pair of hair shears attack.

It is later revealed in the Mirror Hell Arc she has the control over Space in the Seven Mysteries. Within her boundary, she is capable of accessing other areas, such as Number 3's boundary. With Yako removed from her School Mystery seat, her boundary while still accessible became overgrown with spider lilies from lack of care.

Trivia

 * Her favorite snack is sweet-bean-jelly sandwich.
 * Her latest concern is that it's very hard to groom herself.