Shikki

Shikki is a background character of the Don't Toy With Me, Miss Nagatoro manga series. She is a high school student and a schoolmate of Nagatoro and her friends as well as one of the best member of the school's judo club; holding a grudge to the protagonist for having left the sport and considering her a "quitter", she is often very harsh to Nagatoro despite deep down respecting her deeply. Her full name is currently unknown.