Ruby Hoshino

In her past life, Ruby was a frail girl who died of anaplastic astrocytoma and could barely walk a few steps without stumbling. Now overwhelmed with joy as Ruby Hoshino, the daughter of her favorite Idol Ai, takes her life to the fullest, Ruby has given herself the goal of becoming an idol singer, not only to follow in her mother's footsteps, but also to fulfill her promise to Gorou. Unbeknownst to her, Gorou had already passed away and been reborn as her older twin brother, Aqua.

Unlike Aqua who is calm, calculated and discreet. Ruby is the polar opposite of him 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.

Ruby is a young girl with average height. She has blonde hair that she ties in a side ponytail like her mother does. Ruby possessed pink-ruby colored eyes, with a six-star on her left eye like to her late mother.

Ruby has been stated to resemble her late mother by many people, such as Aqua and Kana. Kana herself confirmed that her keen nose in industry "can sense potential to this girl" and it reminds her of Ai Hoshino. The resemblance grows stronger when she wears a purple wig. to the point that it shocks others especially Akane.

Ruby tends to speak her mind without a filter, often referring to Kana as the "gourd girl" and the "girl who will lick a lying snitch," much to Kana's displeasure. Additionally, Ruby has utilized the "airhead sister" persona to her advantage in the media as a character she created to promote herself.