Riko Aida coaches the Seirin High boys’ basketball team, honing her “Analyzer Eye”—a skill refined in childhood while observing athletes at her father Kagetora’s sports gym. This ability lets her pinpoint players’ physical strengths, vulnerabilities, and injury risks through visual analysis, shaping her approach to crafting demanding training routines, adapting tactics mid-game, and prioritizing athlete health via customized conditioning. Though initially skeptical of basketball teams challenging powerhouses like the Generation of Miracles, she joined Seirin after witnessing founding members Teppei Kiyoshi and Junpei Hyūga’s resolve to pursue national titles. Her leadership merges stern discipline with genuine investment in the team’s progress, often leveraging threats of intensified drills to push players. Despite her confident demeanor, she privately wrestles with self-consciousness about her flat chest, a trait highlighted by comparisons to peers like Satsuki Momoi and occasional teasing. Beyond physical assessments, Riko’s sharp intellect earns her the rank of second in her class, and she juggles coaching with student council vice-presidency. She manages logistical tasks, prepares vitamin-heavy meals (notorious for their unpalatable taste), and offers halftime massages. Her rapport with the team blends casual familiarity—calling Kiyoshi and Hyūga by first names—and rivalry, particularly with Momoi. In *Last Game*, she aids in orchestrating the Vorpal Swords’ retaliation against Jabberwock, partnering with her father and Momoi to strategize against the American team’s taunts. While her film role emphasizes behind-the-scenes support and morale-boosting, her tactical insights remain pivotal. A symbolic haircut during the Winter Cup, later briefly grown out, mirrors her dedication to Seirin’s national aspirations. Her history includes a childhood bond with Hyūga, who nurses unspoken affection she seldom notices. She prizes determination and integrity, living by the mantra “say it, then do it.” Though defined by her coaching intensity, she unwinds with puzzle games, knitting, and a fondness for bear-themed accessories, hinting at a playful side beneath her driven exterior.