Mary Kikakujō, a French-Japanese member of the Supreme Five Swords at Private Aichi Symbiosis Academy, sports long wavy blonde hair, blue eyes, and a fair complexion, her 1.61-meter frame balancing athleticism with precision. Born November 25 (blood type O), her Spanish upbringing forged expertise in Western fencing, later fused with Jigen-ryū principles to craft a hybrid swordsmanship style targeting nerve clusters through calculated thrusts. Rigidly adherent to rules and etiquette, she prioritizes formality even in combat, though emotional spikes trigger rapid French speech and fumbled Japanese—prompting frequent consultation of a vocabulary book for terms like "kiss."

Her disciplined exterior fractures after clashing with Fudō Nomura, whose ethical rigor sparks unanticipated romantic tension. This fuels jealousy toward rivals and an alliance with Rin Onigawara to surveil his activities, contrasting her earlier stoicism. Paradoxically, her propriety coexists with blunt physical advances toward Nomura, all met with rejection and palpable frustration.

In battle, she employs the Flick technique to redirect attacks past defenses and Redoublement—a chaotic flurry of strikes—complemented by agile footwork to overwhelm foes. These skills let her pressure adversaries like Nomura and dismantle groups such as the Hanasaka Musketeers. Familial ties include a younger sister, Choka U. Baragasaki, her Japanese-heritage subordinate who mirrors Mary’s multicultural roots through artificial Westernized features.

While her induction into the Supreme Five Swords remains unexplained, she operates as a core enforcer within the group’s hierarchy. Consistent across all media, her narrative hinges on the clash between regimented discipline and burgeoning emotional exposure, her dual cultural identity and combat mastery anchoring her role in the academy’s power dynamics.