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 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 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. All this was cut short when, through unfortunate revelations, she diverted her energy elsewhere toward more unsavory methods of reputation building. The darker aspects of the entertainment industry fundamentally changed her attitude.

Appearance
Ruby Hoshino possesses features that liken her to her mother; 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
Unlike her brother, who is calm, calculated, and discreet, she is the polar opposite of him. She is extroverted, outgoing, loud, 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.

By Chapter 79, Ruby became a shell of who she once was and a complete antithesis of the previous paragraph personalities. She became eerily similar if not more dark than Aqua was when he was in his darkest moments. She felt empty as well as disdainful for the murderer of Gorou, as everything she worked so hard to accomplish became worthless. The murderer stole the future she wanted and so, she resolved herself to ensure Gorou gets justice, even if it meant using her brother who finally attained true happiness with Akane.

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.
 * She later gains an additional star in her right eye after revolving to use dirty tactics to rise in the entertainment industry.
 * The stars in Ruby's eyes grow in size when she gets aggravated and even become blackened when pushed to her limits.
 * 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).