Ruby is the polar opposite of her brother Aqua, as she is extroverted, outgoing, loud, optimistic and communicative compared to her brooding brother. She is most apparent in the connections she makes with others. she is the daughter of the late Ai Hoshino, following in her footsteps as an idol, wanting to bring joy and happiness to her fans, she has moved on from her mothers death and loves what she does, her greatest asset is her natural beauty, she is super cute and uses it for her idol job.