Kotoha Kutsugi operates as the highest-ranked member of the Covert Squad within Miyagami Academy's Maximum Authority-Wielding Best Student Council. Her physical traits include dark brown hair, brown or grey eyes, and a stature ranking among the school's shorter students. Born December 24th with blood type O, she maintains a characteristically reserved and stoic demeanor, often observed as expressionless by peers. This outward composure contrasts her fierce loyalty to the Best Student Council and its president, Kanade Jinguuji, driving a protective commitment to their interests.

Her combat expertise centers on shuriken proficiency, unarmed techniques, and mastery of disguise, enabling effective covert operations and intelligence gathering for the squad. A pivotal evolution occurs in her dynamic with fellow council member Kuon Ginga. Discovering Kuon infiltrated for an external group targeting Jinguuji family secrets, Kotoha initially responds with suspicion and hostility, viewing her as a threat and attempting covert intervention. Witnessing Kuon's internal conflict between her mission and genuine council loyalty—particularly regarding difficult choices—prompts Kotoha to reassess. She ultimately accepts Kuon's leadership of the Covert Squad, acknowledging her sincerity.

Beyond covert duties, Kotoha adopts a pragmatic approach to responsibilities and exhibits sharp wit, occasionally deploying sarcasm when provoked or under tension. Her unwavering loyalty cements her role as a dependable asset within the council's operational framework.