Mikino Oka

Mikino Oka is a supporting character in the Sound! Euphonium series. She was a student at Kitauji High School two years above Kumiko Oumae who played bassoon in the school's concert band. Mikino is a considerably tall girl with curly black hair that is held up in a ponytail by a green bow on the left side and purplish-blue eyes. Mikino is usually seen with a normal Kitauji High School uniform for third-year female students.

Mikino is shown to be an outgoing and even-tempered girl who is very friendly to Raina Kitamura that she seems to have a good relationship with her, who is also a bassoonist.