Gou Matsuoka

Gou Matsuoka (松岡 江, Matsuoka Gō) is Rin's younger sister. She is a 1st year student of Iwatobi High School and is Nagisa's classmate.

Appearance
Gou is a petit girl with long burgundy hair, tied back in a ponytail. She has olive-toned skin and amber eyes, and is usually seen wearing the standard Iwatobi school uniform.

Personality
Gou has an easygoing and refreshing personality, as shown by the way she talks. However, despite her friendly persona, she can get very angry if someone were to call her "Gou" because it is a rather boyish name for a girl. She prefers being called "Kou" and will always try to correct anyone who chooses to call her otherwise. Nagisa calls her "Gou," despite her constantly trying to correct him.

Gou also seems to be worried about her brother a lot, as she constantly checks up on him and sees to it that he is alright. She even opted to be the Iwatobi Swim Team's manager, so that they could help in changing Rin back to his old self.

As a manager, Gou can be strict when needed, but at the same time, supportive of the swim team's decisions and feats. She is actually quite efficient in her role as manager and often makes the effort to improve on their training by setting up the team's regimen and organizing joint swimming practices.

Gou has an odd tendency to blush and get overly enthusiastic whenever she admires the muscles of men, but can get tired of it if it goes on too long.

Rin Matsuoka
Gou is constantly worried about her brother.

Nagisa Hazuki
Though Nagisa is constantly upsetting Gou by calling her Gou instead of Kou, the two seem to be on good terms and rarely fight (aside from him refusing to call her Kou).

Haruka Nanase
In the first episode, Gou visited Haruka's house to ask him for information about her brother. She is also constantly swooning over Haruka.

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Gou Matsuoka