Shikou Soujin is a 17-year-old third-year student at Kyosho Academy, born on May 16. She possesses black hair, green eyes, stands 161 cm tall, and has a physique measuring B78-W56-H82 cm. Identifying as female with a tomboy disposition, she reacts fiercely to insults about her femininity. As the successor to the warrior Cao Ren from the Three Kingdoms era, she holds an official B-rank fighter designation per Koukin, though she personally claims A-rank status. Her duties involve leading and managing lower-ranking fighters within the academy.

During an assault on Seito Academy, she wielded one of the Hyakuhekitō weapons. In that conflict, she attempted to distract opponent Kanshou by exposing her shorts, but the ploy failed, resulting in her knockout. Her subordinates attributed this failure to her boyish appearance undermining the tactic. Later, she represented Kyosho alongside Chuukou Kyocho in a tournament on Nanban Island. The event proved to be a trap, leading to her capture by Nanban fighters. While imprisoned, she recognized Teni among the assailants, revealing the identity of the mysterious Kentei.

She was present at Kyosho Academy during Bachou Mouki’s confrontation with Sousou Moutoku. Additionally, she appears in the *Extravaganza Epoch* OVA.