Onikata Kayoko is the "Section Chief" of Problem Solver 68, a self-proclaimed mercenary group, and a third-year student at Gehenna Academy. Unlike the other members, Kayoko is not one with bad intentions. However, she is often mistaken for a delinquent due to her naturally scary facial expressions and appearance. She usually prefers to remain silent on the subject, as it would likely contribute to her scary image. Kayoko is a girl of few words. At first glance, she has an intimidating appearance and is often mistaken for a troublemaker. In reality, she is a gentle and relaxed individual who goes along with whatever Problem Solver 68 pulls her into. Of all the people in the club, she is the most reasonable, calm, and least destructive, as she doesn't actively seek to cause trouble (though she will still participate when necessary). She enjoys collecting music CDs, and her favorite genre is rock. Cat lover. Kayoko likes to share her favorite heavy metal music with Sensei and talk about it. Sensei sometimes helps her get out of trouble, such as when she is being questioned by the police, by covering for her as her advisor. She's still a bit suspicious of Sensei's motives for spending time with her, but still appreciates it and feels comfortable being "in debt" to Sensei. Kayoko gets easily shy when Sensei teases her. Kayoko is 18 years old and 157 cm tall. She has white hair with black bangs and a black ponytail tied to her horns. She has red eyes, pale skin, and a mole on her lower neck. She wears a black hooded sweatshirt with "Born.To.Kill" written on it, in addition to a standard uniform underneath with a brown t-shirt, pleated red checkered skirt. She also wears black sneakers with red lines. She carries a black backpack with a gun holster attached to the strap. Like other students, she has a halo over her head, which is a white pentagon with three sharp points and another upside-down pentagon inside, resembling the trunk of a rose. Kayoko uses a black and white Heckler & Koch P30L pistol with a black suppressor. The slide and grip are chromed silver, while the receiver is gray. The name of the school is printed on the left side of the receiver. She called it "Demon's Roar". Her status message on Momochat is "Not on here much...". Her birthday is March 17th.