Riko Nagase (長瀬 梨子,Nagase Riko?) is a supporting character in the Hibike! Euphonium series. She is a second year student who plays the tuba and is charge of the tubas in the Kitauji Concert Band.
Riko is a young teenage-girl below average height and slighty above average weight who wears the standard Kitauji High School uniform for second years. Her dark brown hair is styled in two low buns, and she has brown eyes. She has relatively thick, dark eye-brows.
Riko is a soft-spoken and friendly girl who is polite and respects everyone in the school. However, she can also be serious at times. She is in a relationship with Goto, though she doesn't want to publicise it.