Inoue Junna

Junna Inoue is a supporting character in [i]Sound! Euphonium[/i] series. She is a student at Kitauji High School in the same year as Kumiko Oumae who is a percussionist in the school's concert band. She became the band's percussion section leader during Kumiko's third year. (Source: Hibike! Euphonium Wiki)