Mirja Kitora, also written as Miruya Kitora, is a 16-year-old second-year student at Ayanokouji Martial Arts School. She possesses a mixed heritage of Japanese and Scandinavian, with some sources suggesting a potential Russian background. Her physical appearance is defined by striking silver hair and golden eyes. She stands 170 centimeters tall and has blood type A. Her surname, Kitora, combines the characters for "tree" and "tiger."

She wields the okatana Jikkyuu Mitsutada and serves as a commander and analyst for her team, where she applies her considerable skill in assessing combat situations and devising effective strategies. Her demeanor is characteristically cool, aloof, and deeply devoted to her duties.

Beneath this reserved exterior, she does not dislike people. A defining passion is her unmatched expertise and enthusiasm for katanas, making her a devoted katana otaku. She can recall sword inscriptions and the signature traits of other Toji entirely from memory. Her eyes sparkle and her demeanor becomes notably animated whenever the topic of katanas arises.