Tsune Watanabe

Tsune Watanabe is a supporting character in the Sound! Euphonium series. She was a student at Kitauji High School two years above Kumiko Oumae who played flute in the school's concert band. Additionally, she was the band's alumni coordinator. Tsune is a teenage girl with an average build. She has wavy chest-length light-brown hair, that has a braid on her right where it is tied across her head by two pink heart pins; burgundy-colored eyes and very thin eyebrows. She is usually seen with a normal Kitauji High School uniform for female third-year students.

Not much is known about Tsune's personality.