|Romanized Name||Hattori Yuu|
|English Name||Yū Hattori|
Himezakura Private Girls' Academy
|Data Carddass Game||2015 Series - Part 2 (campaign)|
|Anime||Aiming the Star☆彡|
Yū Hattori (服部 ユウ Hattori Yuu) is Akari's old roommate who encourages and helps her when she's feeling down. As of the 2015 series, she and Miyabi Fujiwara are now mascot characters for Aikatsu's official shop.
Yū has cropped platinum-blonde hair in a bob, with a cowlick on the top. She has purple eyes and wears a single pink, star-shaped earring on her right ear.
Yū is a helpful person who often encourages others and tries to cheer them up when they are down.
Hattori (服部) Hatto (服 fuku) means clothing and combined with Ri (部 bu) which means section, class, or department, Hattori means clothing guild.
Yū (ユウ) is a common unisex Japanese name that has multiple meanings.
- Her Zodiac sign is Cancer.
- Her favorite foods are pancakes and citrus fruits.
- Her specialty is jazz dance.
- Yū is a cool-type idol, as confirmed in Episode 102.
- According to her Starlight profile, her favorite brand is Swing Rock.
- A notable trait she has is her toothy smile.
- According to her official profile Yū is 156 cm tall.
- She goes to Himezakura Private Girls' Academy as an exchange student in Episode 118, and to Étoile Academy in Episode 135.
- In Episode 156, it is revealed that Yū is now known as the "Traveling Idol" (旅アイドル Tabi Aidoru) due to her travelling all over Japan as a regular on travel shows and being the campaign girl for a travel agency. This makes her the fourth idol to have an in-universe nickname.
- Main article: Yū Hattori/Image gallery