Aika Hayase is a member of Sweet Diva.
She's a slim young woman with long blue hair that reaches her middle back and is held two long high pigtails.
She wears the traditional attire of sweet diva.
In the beach she wears a yellow bikini with white linings.
She's a bit girly but still cares about her band mates like when she was comforting Sakura after her loss and begging her to come back after the fight with Elena.
She appears through out the series along with Yuuho, either showing Elena's inability to lead or making small talks.