Ruby Hoshino possesses features that liken her to her mother Ai Hoshino, and shares similarities with appearances with her older twin brother Aqua Hoshino, such as the color of their skin and hair. She is often being compared to her mother in many aspects, such as her facial features and the distinct look in her left eye featuring a star. polar opposite of him as she is extroverted, outgoing, loud, optimistic, and communicative compared to her brooding brother kind. Has brother named Aqua.