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 Nagisa's classmate.

Appearance
Gou is a small girl with long burgundy hair, tied back in a ponytail. She also has red eyes.

Personality
She has an easygoing personality, shown by her way of talking. She gets very angry if someone ever calls her 'Gou', which is a rather boyish name. She seems to be worried about her brother a lot.

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