Aiichiro Nitori

Aiichiro Nitori (似鳥 愛一郎 Nitori Aiichirō) is a swimmer on the Samezuka Academy swim team.

Appearance
Aiichiro has short gray hair with short, straight bangs. He has blue eyes. A notable feature is his beauty mark, which is located diagonally under his right eye.

Personality
Aiichiro seems to be friendly and a slight chatterbox. Sometimes he speaks a little too much, like when he mentioned that all the Iwatobi swim team members have girly names, but is quickly reminded by Rin's glare that Rin also has a girly name.

History
In elementary school, Aiichiro was in the same swimming competition as Rin, Haruka, Makoto, and Nagisa. However, he and his team lost in the prelims.

Theoretical Dolphin Kick!
While running with Rin, Rin says to Aiichiro that he didn't know there was going to be a joint practice with the Iwatobi swim club. Aiichiro tells Rin that the captain made the call, and mentions that the club's team members all have girly names. However, he immediately cuts himself off after Rin glares at him and is reminded that Rin also has a girly name, to whom he quickly apologizes to. When Rin asks him how does he know, Aiichiro tells him he was in the same swimming competition as them and says that the race was amazing to watch.

Seijuro Mikoshiba
Seijuro and Aiichiro are both on the Samezuka Academy swim team.

Rin Matsuoka
Initially, Aiichiro and Rin were not on the same team. However, once Rin joined the Samezuka Academy swim team, the two became teammates. The two are also roommates and thus are mostly together.

Aiichiro also shows to be faithfully loyal to Rin, even after being yelled at or brushed aside by him throughout the series; he continues to cheer him on and support him.

It seems like Aiichiro knew Rin since elementary school.

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Aiichiro Nitori