A Cool type 3rd year, Yumi is a cool and serious flute player. She only joined because Seira wanted to.

In M's songs, Yumi will most likely take the role of Eli, and in Aqours, she will usually be Dia, though this is subject to singer preference on a song-by-song basis. This does not mean she needs to sound like either, only that she is likely to sing those lines.