Kuro Kiryu is a student at Yumenosaki Academy and later Ensemble Square, belonging to the traditional Japanese-style idol unit AKATSUKI under Rhythm Link. His childhood began with learning needlework from his mother alongside close friend Shu Itsuki, but was marked by her loss to illness during his youth. This cemented his family-oriented nature, leading him to prioritize caring for his younger sister and father. He initially enrolled at Yumenosaki Academy to project a positive, admirable image for his sister despite his intimidating looks. He possesses a tall, muscular build, spiky crimson hair, light yellow-green narrow eyes, and multiple ear piercings. His stage attire reflects AKATSUKI's traditional aesthetic, typically featuring a fur-trimmed kimono with asymmetrical sleeves, an obi belt, martial arts-inspired wrist tape, and occasionally a purple fan. Off-stage, he often modifies his school uniform, wearing an unbuttoned white shirt over a black undershirt and adding metallic accessories. During Yumenosaki's "War Era," Kuro leveraged his delinquent reputation and exceptional physical strength strategically. Recruited into AKATSUKI by Keito Hasumi, he participated in the violent "Dragon King Competition" variant of DreamFes events, where physical confrontations were permitted. His martial prowess intimidated opponents into frequent forfeits, cementing AKATSUKI's dominance. This period involved morally complex actions, including participating in executing Shu Itsuki and Kanata Shinkai, with AKATSUKI undertaking the latter partly to shield the unit fine from reputational damage. Concurrently, he maintained friendships like the one with Nazuna Nito and fulfilled costume design requests for groups such as DEADMANS, gaining school recognition for his sewing skills. His personality sharply contrasts his exterior. Despite an intimidating appearance marked by scowling eyebrows and a delinquent past, he demonstrates earnestness, protectiveness, and domestic inclinations. He openly cares for his sister, sewing elaborate garments ranging from delinquent-style embroidery to frilly dresses, and cooks for his unit. This duality extends to his performing style, combining a powerful, husky singing voice with precise, dynamic stage presence. He communicates bluntly but avoids unnecessary confrontation, often motivated by underlying guilt over past actions. His protective instincts extend beyond family to unit members and friends, adhering to a principle of not forgiving those who harm his allies. Post-War Era development focuses on atonement and mentorship. As karate club president, he supports junior Tetora Nagumo's efforts to revive the Dragon King Competition as a non-violent event, participating despite reservations to bolster Tetora's confidence after a setback. He reflects on his past role in the competition's brutality during interactions concerning "Mysterious Fighter M," indicating unresolved remorse. Professionally, he commits fully to idol work, designing costumes for multiple units including Trickstar and AKATSUKI, and expresses dedication to becoming an idol worthy of fan support. His relationships within AKATSUKI deepen, with Keito Hasumi acknowledging his reliability and Souma Kanzaki expressing deep respect for his guidance and domestic skills. Trivia includes his motion sickness, exceptional strength enabling him to lift adult peers, height parity with Rinne Amagi, and association with the dragon motif complementing Tetora Nagumo's tiger symbolism. His solo song "Crimson Soul" potentially references his name etymology – "Kuro" incorporating the character for crimson (紅) and "Kiryu" containing characters for demon (鬼) and dragon (龍).