Tadashi Yamaguchi is a fictional character from the anime series 'Haikyuu!!'. He is a first-year student at Karasuno High School and a member of the school's volleyball team. Yamaguchi is known for his timid and shy personality, but he is deeply committed to improving his skills on the court. Despite his initial lack of confidence, he becomes a reliable pinch server for the team, specializing in jump float serves. Throughout the series, his growth and determination make him an inspiring character who overcomes his insecurities to contribute to his team's success.