Oumae Kumiko is the protagonist of Hibike! Euphonium. She plays the euphonium in the Kitauji High School concert band. She develops close relationships with other band members, especially Kousaka Reina, Katou Hazuki, Kawashima Sapphire, Tanaka Asuka, and Nakagawa Natsuki. Tsukamoto Shuuichi is her childhood friend.

Kumiko has short brown hair, which is often described as curly or "fluffy". She has brown eyes.

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