Kawashima Yuuka

 (河島佑香), married name Ushio Yuka (潮佑香) is a former member of Perfume.

Before the group's debut in 2001, Kawayuka quit the group in order to focus on studying. After quitting the group, she later joined Pinkies, then Risky, and lastly espoir before attempting to go in alone as a solo idol named Yuka.

On February 15, 2020, it was announced she had gotten married to Ushio Keita, they had met 10 years prior.