According to official Haikyuu!! character materials, Oikawa uses his spare time to coach young children, including his nephew, at a place called Lil Tykes Volleyball Classroom. This detail reflects his deep-rooted love for the sport and his desire to nurture the next generation of players.
While he's known for his competitive and sometimes cocky personality on the court, this behind-the-scenes aspect of his life shows a more caring and responsible side. It also highlights how much volleyball means to him—beyond just winning matches.
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