Aine Yūki is a cheerful and positive idol who attends Star Harmony Academy, transferring from the normal division to the idol division after a chance encounter with Mio Minato at her family’s Penguin Café. This meeting leads to them forming the unit Pure Palette. Her defining catchphrase is her goal to make one million friends, reflecting her belief in the power of genuine connections. Over time, she learns to value the depth of each friendship, declaring that even with a million friends, Mio remains irreplaceable. She is naturally sociable and always ready to help a friend in trouble.

Aine has vibrant red-orange eyes with golden flecks and long, curled pink hair that transitions into a peach or chardonnay-orange ombre. Her hairstyle evolves from a light turquoise headband to a sky blue or turquoise bow worn on the side as her hair grows longer and curlier. She stands 155 cm tall. Her preferred fashion brand is Sugar Melody, created by designer Chiharu Hachiya after Aine admired her sketches, making her the brand’s muse.

She is the middle child in a large family that runs the Penguin Café, with parents Masamune and Nene, elder siblings Kazune and Suzune, and younger siblings Momone and Yoshitsune. Her favorite food is the café’s tomato basil cheese sandwich. She dislikes crying and excels at music and small talk. Her birthday is July 20. Her name combines meanings of love and sound (Aine) with friend and hope (Yūki).