Also known as "Haru" or "Haru-chan." The ace of the Iwatobi High School Swim Club, he's a quiet and aloof third-year student. He has an unusual obsession with water and loves freestyle so much that it's the only stroke he'll swim. He doesn't show much emotion, but he cares deeply for his friends and possesses a pure passion for swimming that surpasses anyone else's. A cool-type protagonist, his occasional airheaded moments are also part of his charm. Around 175cm tall. First-person pronoun: I (ore).

The captain-like figure of the team, affectionately known as "Mako-chan." A third-year at Iwatobi High, he's calm, caring, and often described as the team mom. Tall and nurturing, he's Haru's childhood friend and has supported him for years. His specialty is the backstroke. Despite his gentle personality, he has a strong core and shows his reliability when protecting his friends. 183cm tall. First-person pronoun: I (ore).

The bright mood-maker of the team, also called "Nagisa-kun" or "Nagi." A petite and energetic second-year at Iwatobi High, his high-spirited personality livens up the team. He loves cute things and is very friendly, but he's also a surprisingly hard worker. His specialty is the breaststroke. His charm lies in his great communication skills, allowing him to fearlessly get close to his upperclassmen. 165cm tall. He calls everyone with "-chan." First-person pronoun: I (boku).

Often called "Rei-chan." He was originally in the track and field club but joined the swim club after being captivated by "beautiful form." He's an intellectual and a theorist, approaching everything with data and logic. However, he's actually quite emotional and cares for his friends. He couldn't swim at first but overcame it through hard work. His specialty is the butterfly. Around 177cm tall. A second-year at Iwatobi High. First-person pronoun: I (boku).

Also known as "Rin" or "Rin-chan." The captain of the Samezuka Academy Swim Club and a third-year student. He is Haruka's childhood friend and greatest rival. Passionate, competitive, and prone to emotional swings, but he's also fiercely devoted to his friends. Having experience abroad, he has a strong desire to compete on the world stage. A charismatic type who excels at freestyle and butterfly. Around 177cm tall. First-person pronoun: I (ore).

A cool and skilled swimmer called "Sosuke" or "So-chan." He is Rin's childhood friend and confidant. Taciturn and mature, he doesn't show his emotions, but he's incredibly passionate on the inside. His struggle with a shoulder injury while maintaining his obsession with swimming is a key part of his character. His main stroke is the backstroke. Around 186cm tall. The ace of Samezuka Academy and a third-year student. First-person pronoun: I (ore).

Affectionately known as "Ai-chan." A second-year at Samezuka Academy who strongly admires Rin. He can be a bit timid and clumsy, but he's earnest, honest, and a hard worker. He grows as a person while being pushed around by his upperclassmen. His specialty is the butterfly. Around 168cm tall. First-person pronoun: I (boku).

Known as "Momo" or "Momo-chan," he's a ball of energy. He's Seijuro Mikoshiba's younger brother, is always hyper, and expresses his feelings directly. He's a bit of a noisy flirt, but as a junior member, he helps lighten the mood. He excels in strength, and his swimming is powerful. His main stroke is freestyle. Around 177cm tall. He calls Nagisa Hazuki "Nagisa-cchi" and is particularly close to him. A first-year at Samezuka Academy. First-person pronoun: I (ore).