Ruby 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 female protagonist and one of the titular characters of Oshi no Ko. In her previous life, she was known as Sarina Tendouji, a terminally ill patient 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. Afterward, determined to fulfill her mother's dreams, she reformed Ai's idol group with the support of her friends. Ruby is a beautiful young girl of average height with blonde hair that she ties in a side ponytail (much like how her late mother Ai Hoshino does) and possesses pink-ruby colored eyes with a six-star on her left eye like her late mother.

Ruby has been stated to resemble Ai by many people, such as Aqua Hoshino and Kana Arima where Kana herself confirmed that her keen nose in industry "can sense potential in this girl" and it reminds her of Ai. The resemblance grows stronger when she wears a purple wig, to the point that it shocks others especially Akane Kurokawa. 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 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. Ruby's greatest asset has repeatedly been noted to be her natural immense beauty. Kana Arima also claimed that she has a charisma about her that draws people in. In addition, her mother taught her how to dance from an early age and even Aqua Hoshino noted that she indeed possessed a natural talent. However, Ruby lacked in arguably the most vital area for being an idol: singing; only scoring a mediocre 38 at karaoke. She also held herself back by refusing to resort to any underhanded tactics, causing Minami Kotobuki to believe that Ruby was too "pure" for the cutthroat entertainment industry. Ruby's height is 158 cm [1], making her the tallest B-Komachi member (compared to Kana Arima's 150 cm and Mem-Cho's 155 cm). Kana Arima「有あり馬ま かな, Arima Kana?」 is a major supporting character in Oshi no Ko. She is a childhood acquaintance of Aqua and Ruby Hoshino and a prodigious child actress, though her popularity has waned over the years. She is also the center of the revived idol group B-Komachi.

Though talented, she eventually got fewer jobs due to being difficult to work with, causing her to change her acting style to survive in the industry. However, after meeting Aqua and Ruby again and being recruited into B-Komachi as well as through her rivalry with Akane Kurokawa, she steadily began to undo the shackles she placed on herself. Kana is described as a cute girl having an innocent face, shoulder-length pinkish-red hair that has blunt bangs and pinkish-red eyes.

Due to her occupation and high cute fashion sense, she often wears various outfits and hats. Initially introduced as a cocky child actress with a sharp tongue, Kana was moved to tears after witnessing Aqua Hoshino's performance. However, since then, she has matured and grown into a much kinder person, although her gruff manner of speaking still surfaces when she experiences intense emotions. She has consistently strived to become a better version of herself. Though things have cooled down for Kana toward stardom, being a great actress is still her main goal.

Kana is described as a diligent and hardworking girl who is empathetic, cheerful and confident with an impressive sense of responsibility. She can also be rude and sharp-tongued at times due to her past. She continued honing her acting even when she could not find work, as mentioned above. She also puts the quality of the product above everything else, even willing to lower her acting level and risk her reputation as an actor.

When Kana was a child, people often praised her for her talents which led to her being called a genius actor. However, this got over her head and influenced her personality leading to her becoming pompous, imperious, and extremely difficult to work with. Mem-Cho「MEMめむちょ, Memu-cho?」, real name unknown, is a major supporting character in Oshi no Ko. She is a popular Youtuber, former Tik-Toker, and a member of the revived B-Komachi.

Missing her chance at becoming an idol due to family circumstances, she nonetheless managed to become a popular streamer, with her renown securing her a spot on the reality dating show LoveForReal. Following the show's conclusion, she was finally given another shot at her dream when fellow cast member Aqua invited her to join B-Komachi, with the other members accepting her despite being far past the ripe age of an idol. Mem-Cho is described as being attractive, cute, and innocent. She has aqua-colored eyes, brown hair dyed blonde, a cat smile, and small devil horns. Despite being twenty-seven, she looks younger than she is. Personality

Mem-Cho is generally playful, bubbly and somewhat mischievous, which makes her look adorable to any onlooker. In some regards these characteristics could be perceived as lies to protect herself and allow her to fake her age and portray the persona of a typical high schooler. Aqua Hoshino「星ほし野の アクア, Hoshino Akua?」, full name, Aquamarine Hoshino「星ほし野の 愛あ久く愛あ海まりん, Hoshino Akuamarin?」 or more commonly referred to as just Aqua「アクア, Akua?」, is the male protagonist and one of the titular characters of Oshi no Ko. In his previous life, he was known as Gorou Amamiya, a medical doctor who was murdered by a stalker of one of his patients, Ai Hoshino, and reincarnated as the latter's child.

An orphan and a fan of Ai in his previous life, he enjoyed being her child, entering the entertainment world from an early age. Unfortunately, this happy life ended when the same stalker who killed him in his previous life murdered his new mother as he watched. This event fundamentally changed him, prompting him to go down down the dark side of the entertainment industry to find the person who sold Ai out, his father. As a child, Aqua was often called cute by those around him. As he grows older, Aqua becomes a relatively tall boy who is described as "handsome" with blonde hair, much like his younger twin sister Ruby Hoshino. He also long bangs hanging on the left side of his face and aquamarine blue eyes, which his late mother Ai Hoshino named him after, that features a star in his right eye, symbolizing that he and his sister are halves of their mother. Before the tragedy that struck his family, Aqua was considered relatively normal other than his unparalleled prodigious talent in acting even as a child and his quick wit and intelligence like reading complex books. With him retaining his past experiences, he accomplished many things not expected for someone his age. Performing acting jobs was something he was open to and excelled at.

After the tragedy that killed his mother, Ai Hoshino, he changed and became cold, calculated, cunning, and discreet, willing to do whatever means necessary to see his goal of finding his father through. Ai Hoshino「星ほし野のアイ, Hoshino Ai?」 was the titular character and the poster child of Oshi no Ko. She was the lead idol of the original B-Komachi and mother of Aqua and Ruby.

As an idol, she lived a life of deceit by pretending to genuinely love her fans. After becoming pregnant with the twins, to not squander her reputation, she gave birth and raised them in secret, playing the role of both idol and mother. However, her lies inevitably caught up with her when she was fatally attacked by a disgruntled fan, using her final moments to tell her children that she loved them.

Even after her death, her influence is felt throughout the remainder of the series, with her daughter carrying on her legacy while her son devoted his life to revenge against the one who sold her out, her ex-boyfriend Ai was a beautiful and quite thin girl with gradient-colored eyes from purple to pink and a six-pointed star in each of her eyes. She was shown to have brownish-red hair on the first chapter cover, but it is shown to have more of a blue-purplish hair color on the volume cover.

Her idol outfit was adorned in a pink aesthetic of varying degrees of lighter and darker shades. The outfit's design has an overall ruffled appearance. A black belt is located on her waist, and other miscellaneous accessories are present throughout the design: three blue stars on her chest, a heart-shaped necklace on her neck and a bunny hairpin accentuated by two gold stars and a pink ribbon.