Kou (voiced in Japanese by Akeno Watanabe and in English by Jamie Marchi) is one of the secondary characters in the anime series Free!

She is Rin Matsuoka's younger sister, and despite the familial connection, she does not actually attend the same school as him, instead being part of the Iwatobi High School group. She prefers being referred to as Kou, rather than Gou.

Kou has reddish eyes and wine red hair, just like her brother, but hers is worn long and tied up in a high ponytail with a blue tie. She wears the girl's Iwatobi uniform, consisting of a white button up shirt, a ribbon necktie, and a grey cardigan, all of which are topped by a black blazer, worn with the school's patch on the chest. The rest of it is fairly standard school clothes, with a brown pleated skirt, dark indigo long socks, and blackish-brown loafers.

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