Age: 14
Blood type: AB
Height: 156 cm
Birthday: 17 July
Sign: Cancer
Specialty: Jazz
Favorite food: Pancakes and Citrus fruits

Yū Hattori is a student of Starlight Academy and Akari's old roommate. She is a helpful person who often encourages others and tries to cheer them up when they are down. She took part in a student exchange program in Himezakura Private Girls' Academy. According to her Starlight profile, her favorite brand is Swing Rock.

Yū has very short platinum blonde hair in a boyish cut with what looks to be a cowlick against the top section. She has purple eyes and wears a single pink, star-shaped earring on her right ear. Yū is a cool-type idol, as confirmed in Episode 102.