Tatsuo Isozaki

Tatsuo Isozaki (磯崎 辰雄, Isozaki Tatsuo) is a lifeguard who works alongside Gorō Arashiyama. In the manga, he is introduced as Gorō's team-mate in a volleyball tournament, while in the anime, he appears prior to said volleyball tournament taking place, and is already recognized by Ika upon his debut.