Unbeknownst to her, Gorou had already passed away and been reborn as her twin brother. Now overwhelmed with joy as Ruby Hoshino, the daughter of her favorite Idol, 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 Amamiya. In her past life, she was a frail girl who died of cancer who could barely walk a few steps without stumbling. Her eyes are ruby-colored, which her mother named her after, and she usually wears an idol outfit. She sports blonde hair with pinkish highlights at the end. Ruby Hoshino possesses features that liken her to her mother Ai Hoshino, often being compared to her in many aspects, such as her facial features and the distinct look in her eye featuring a star. Still, unlike her brother, she managed to rise above the tragedy by reforming Ai's idol group and striving to fulfill her mother's dreams with the support of her friends. Unfortunately, this happy life ended when Ai was murdered by a deranged fan.

Neglected by her parents in her previous life and being a fan of Ai, she greatly enjoyed her new life, with her new mother teaching her how to be an idol from an early age. In her previous life, she was known as Sarina Tendoji, a patient suffering from a terminal illness who was cared for by Gorou Amamiya and, following her death, was reincarnated as the child of her favorite idol, Ai Hoshino.

Ruby Hoshino ( 星 ( ほし ) 野 ( の ) 瑠 ( る ) 美 ( び ) 衣 ( い ), , Hoshino Rubii ?), more commonly referred to as just Ruby ( ルビー, Rubī ?), is the deuteragonist and one of the titular characters of the Oshi no Ko manga series. Life is about doing what you want to do! If you keep talking cost this return, you won't accomplish anything! Life can end before you get a chance to accomplish anything it happens.

Drawing the female figure hikaru