Kagetora Aida is Riko Aida's father, a sports trainer and former small forward for the Japanese national basketball team, wearing jersey number 7. He transitioned from professional play to specialize in athletic conditioning, muscle training, and creating customized regimens. While he once coached basketball, he now focuses on training, mentoring his daughter in coaching techniques and sharing his unique visual assessment ability, Scan. This skill, honed through extensive experience, estimates athletes' physical capabilities like muscle mass, flexibility, and potential through observation. Middle-aged, he stands 181 cm tall and weighs 75 kg, with short light brown hair, darker eyebrows, and a trimmed beard. During events like the Winter Cup, his distinctive appearance features a white suit, black shirt, fashionable glasses, and a gold necklace. His personality blends extreme overprotectiveness towards Riko—manifested in actions like threatening Seirin players with a gun—with a perceptive and encouraging coaching style. He often assigns playful nicknames, such as "Ma-Boy" for Masaaki Nakatani, reflecting his informal yet observant nature. He values kindness and reciprocity, living by his motto: "Treating others well also means treating yourself well." Kagetora provides crucial support to Seirin High's development, allowing the team use of his sports gym and serving as their temporary trainer during the winter camp. There, he emphasizes individual skill enhancement as the foundation of teamwork, devising rigorous exercises like mountain-based fartlek runs to improve stamina and adaptability. He personally mentors players: teaching Junpei Hyūga the Barrier Jumper by emphasizing center-of-gravity control, training Teppei Kiyoshi in the Vice Claw technique through rock-gripping exercises, and advising Riko on optimizing Taiga Kagami's play by temporarily benching Tetsuya Kuroko. His methods focus on leveraging innate strengths while addressing weaknesses. He analytically observes Seirin's Winter Cup matches, commenting on pivotal moments like Kagami's matchup against Daiki Aomine. His role expands significantly in the *Last Game* storyline after the U.S. streetball team Jabberwock humiliates Japan's Team Strky and insults Japanese basketball. Enraged, Kagetora challenges Jabberwock to a revenge match, staking his life on the outcome—vowing to disembowel himself if his team loses and demanding Jabberwock return home by raft if they lose. He assembles and coaches "Vorpal Swords," comprising the Generation of Miracles, Kuroko, and Kagami, alongside bench players like Junpei Hyūga and Kousuke Wakamatsu. His coaching includes strategic briefings and fostering cohesion among the individually talented but rivalrous players. He orchestrates from behind the scenes during the match, trusting their combined abilities to secure victory. Following Vorpal Swords' win, he organizes a team celebration. His broader interests include car drifting, Qingjiao rousi (pepper steak), and spending time with his daughter, though he dislikes neckties and laments Riko's busy schedule limiting their interactions.