Ruby Hoshino

"Life is about doing what you want to do! If you keep talking cost this return this, you won't accomplish anything! Life can end before you get a chance to accomplish anything, it happens."

Ruby Hoshino, or more commonly known by her stage name Ruby (ルビー), is the deuteragonist in the Oshi no Ko manga series. Ruby was known as Sarina Tendoji in her past life -- A patient with a terminal illness who became obsessed with idols. Ruby, along with her twin-brother Aquamarine Hoshino, formerly known as Gorou Amamiya in his past life, is the child of the former (now defunct) B-Komachi idol, Ai Hoshino. Inspired by her mother's line of work, she wishes to become an idol just like her, only if her brother wasn't so overprotective of her ever since an incident that turned their lives upside down.

Being motivated since then, Ruby Hoshino worked with Strawberry Productions to revive B-Komachi so she could fulfill her dreams along with the support of her friends -- A stark contrast to her brother Aqua, who swore vengeance against those who wronged his family. She worked intensively towards this single goal; building her connections and building her character.

Appearance
Ruby Hoshino possesses features that liken her to her mother Ai Hoshino; more often than not being compared to her in many aspects. Such as her facial features and the distinct look in her eye featuring a star.

She sports blonde hair with pinkish highlights at the end. Her eyes are ruby-colored, which her mother named her after, and usually wears an idol outfit.

Personality
In her past life, she 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, she 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, Goro had already passed away and been reborn as her own twin brother.

Unlike her older twin brother Aquamarine Hoshino, who is calm, calculated and discreet, she is the polar opposite of him as she is extroverted, outgoing, loud, optimistic and communicative compared to her brooding brother and the like; being the most apparent with the connections she made with others, whilst 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, rather 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," 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).

Trivia

 * Ai Hoshino (Ruby's mother) has one star in each eye where Ruby inherited a star in her left eye and her brother 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 her mother once was.
 * Ruby's height is 158 cm, making her the tallest B-Komachi members (compared to Kana's 150 cm and Mem-Cho's 155 cm).
 * Ruby doesn't like Twitter.