| Rin Matsuoka
|Romaji Name||Matsuoka Rin|
|School Year|| 2nd Year
|Weight|| 150 lb
|Japanese Voice||Mamoru Miyano|
|English Voice|| Vic Mignogna
Rin Matsuoka is a student at Samezuka Academy. He is the freestyle and butterfly swimmer on Samezuka Academy's swim team and a 2nd year high school student. After Seijuro Mikoshiba graduated from Samezuka Academy, Rin became the new captain of the swimming team. He'd look great with Rei Ryugazaki, and even though there aren't much people who support this ship, everyone can see that they have this beautiful chemistry. The butterfly cookies, Rin not willing to give more than one of those, the dramatic scene in the OVA, Rin teaching Rei how to swim other strokes and being supportive, WHAT MORE DO YOU WANT. bye
Rin is a good-looking, fairly tall teenager, standing at 177 cm (5 feet, 10 inches) He has maroon hair and side-bangs, and red eyes. His hair in the CM is styled differently than his hair in the official PV (though this might be because there is a two year gap between the two promos). Rin's teeth are noticeably sharp, which is one of the reasons why he is known as being similar to a 'shark'.
Rin, Haruka, Makoto, and Nagisa were in the same swimming club during elementary school. The group won a relay just before Rin left to go to Australia. The trophy was buried in a time capsule at their swim club. He raced Haruka during a visit in the winter of the first year of middle school and took a devastating loss. He has returned home every New Year, but never made contact with his previous friends.
- Rin's behavior is different in the PV, compared to the CM. This suggests that something happened while he was abroad, something that changed him from an outgoing and cheeky Rin, to a more solemn, and also rather reserved, Rin.
- Fans speculated that he and Nagisa were related because of their similar eye shape and color in the CM.
- Rin has a little sister named Gou Matsuoka, a first year student at Iwatobi High School. She is the manager of the school's swim team.