Ruby Hoshino

"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."

Ruby Hoshino, more commonly referred to as just Ruby (ルビー), is the female protagonist and one of the titular characters of the 'Oshi no Ko' manga series. In her previous life, she was known as Sarina Tendouji, a patient suffering from anaplastic astrocytoma who was cared for by Gorou Amamiya and, following her death, was reincarnated as the child of her favorite idol, Ai Hoshino.

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. Unfortunately, this happy life ended when Ai was murdered by a deranged fan. 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.

Appearance
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.

Personality
In her past life, Ruby was a frail girl who died of cancer who could barely walk a few steps without stumbling. Now overwhelmed with joy as Ruby Hoshino, the daughter of her favorite Idol Ai Hoshino, 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. Unbeknownst to her, Gorou had already passed away and been reborn as her older twin brother Aqua Hoshino.

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. At the same time, Aqua only does this to further his agenda. She doesn't share her brother's opinion of hunting down the culprit who killed their mother, instead moving on from that incident and focusing on her dreams. She persists in this notion to the point where she often conflicts with her brother's interests.

Ruby tends to speak her mind without a filter, often referring to Kana Arima 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.

She is the biggest defender of her mother Ai's secrecy and reputation.

Etymology

 * The name Ruby means "lapis lazuli" (瑠) (ru), "beautiful" (美) (mi/bi) and "clothing, garment" (衣) (i).
 * Ruby's surname Hoshino means "star" (星) (hoshi) and "field, wilderness" (野) (no).

Film

 * 15 Year Lie

Television

 * Dig Deep! One Chance

B-Komachi

 * STAR☆T☆RAIN
 * Our Sign Is B
 * HEART's♡KISS
 * Pop in 2
 * 1 unknown song tittle

Trivia

 * Ai Hoshino (Ruby's mother) has one star in each eye; where Ruby inherited a star in her left eye and her brother Aqua Hoshino inherited it in his right eye.
 * Her star later becomes blackened and she gains an additional black star in her right eye after revolving to use dirty tactics to rise in the entertainment industry.
 * Ruby wants to be an idol like Ai once was.
 * Ruby once pretended to be Amaterasu, the goddess of the sun in Japanese mythology. While the scene is played as a joke at the time, it is later revealed that she and Aqua died (in their past life) and reborn in the town of Takachiho in Miyazaki prefecture. And as Akane Kurokawa explained during that chapter, Takachiho is where Amaterasu once shut herself in.
 * If Ruby is interpreted to be based on Amaterasu, then Aqua would be based on one of Amaterasu's siblings. Assuming that the fan theory of crow girl being the deity Yatagarasu is correct, Aqua is likely to be based on Susanoo.
 * Ruby's height is 158 cm, making her the tallest B-Komachi member (compared to Kana Arima's 150 cm and Mem-Cho's 155 cm).
 * Ruby applied to be an idol at 14, but she was rejected and had to wait two years before applying again.
 * Ruby is in class 1-F during her first year and in class 2-F during her second year at Yoto High School.
 * Ruby starts high school at 16.
 * Ruby's glowstick idol colour is red, which is the same colour as Ai.

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