Yako is a prideful supernatural who thinks little of humans other than her beloved deceased Misaki. She was willing to do anything to bring him back. She has little understanding of humans and their anatomy. As a result, she employed the help of the students to rebuild Misaki's body and had no qualms with removing them if she deemed the bodies they created 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 that she often kept bottled up, but was then dragged out by force.

She prefers to be treated with respect, asking others to call her by her name instead of calling her "Kitsune". In moments of vulnerability, she lashes out by biting others or verbally berating them. However, she still has a bit of a soft side, as seen when she comforted Kou after hearing about the incident with his friend, and even allows him to call her "Nee-san".