Aqua Hoshino

"The guy who made Ai go through such a thing is in the entertainment world. Since that guy is related to me by blood, I can track him through genetic testing with a piece of hair. I can't die yet. Not until I find him... and kill him with my very own hands."

Aqua Hoshino (アクア), full name Aquamarine Hoshino, or more commonly referred to as just Aqua (アクア), 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, getting involved in 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.

Appearance
Aqua has blonde hair like his younger twin sister Ruby Hoshino. He is relatively tall, and has Aquamarine blue eyes, which his mother named him after. He often changes his appearance due to his job as an actor. Aqua is described as "handsome" and features a star in his right eye, symbolizing that he and his sister are halves of their mother. As a child, Aqua was often called cute by those around him.

Due to being Ai's son, many people were able to point out their similarities despite being unaware of his pedigree. Much to Aqua's dismay, as before Chapter 105, he wanted to keep the truth about his late mother from being known to the general public.

Personality
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, he changed, becoming cold, calculated, cunning, and discreet, Willing to do whatever means necessary to see his goals of finding his father through. His psychological trauma from Ai's murder tends to resurface anytime he seems to forget his goals. This is the case when Kana Arima suggested that he'd look back at his happy memories in Chapter 50 to improve his acting on the spot. It is a case of Post-Traumatic Stress Disorder and doubles as an active reminder to not stray from his original purpose of vengeance. He blames himself for being weak-willed during that moment, even though he was but a child. However, he used these negative emotions to exemplify his acting performance during his scenes in the Tokyo Blade Theatrical.

Aqua is described as someone with emotional distance; he is shocked when he hears from Kana that he is  gloomy  , but despite this, he does genuinely care about the people close to him. Aqua is overly protective of Ruby, his younger twin sister. It is mainly described by Taishi Gotanda, his mentor, as someone with a sister complex, which is understandable since he was initially unwilling to let his sister become an idol and suffer the same fate as their mother. Thus, he surreptitiously destroyed almost every chance Ruby could get to be promoted due to this overprotective nature, despite knowing how she longed to follow in their mother's footsteps. Ultimately, he helped Ruby and the new B-Komachi group prepare for a gig so they could accomplish a task long thought impossible. He was also one of the main driving forces behind a project that served to save Akane Kurokawa's reputation.

Skills & Talents
Arguably Aqua's greatest talent is his ability to mimic, as demonstrated when he puts on a disguise and pretend to be Pieyon. His mimicry is so uncanny that he is able to fool his own sister.

In terms of acting, it is Aqua's nature to reenact samples that he saw somewhere as noted by Kana. And after watching tapes of his performance when he was younger, Akane concludes that Aqua's acting are all planned ahead of time. Furthermore Aqua has also demonstrated his ability to improvise on set. Taken together, it suggests Aqua follows the Meisner technique, an acting technique that emphasizes on emotional preparation, repetition exercises, and improvisation.

And due to working for Taishi as an intern, Aqua has also become proficient at editing videos.

Etymology

 * The name Aquamarine means "love, affection" (愛) (a), "long time" (久) (ku), "love, affection" (愛) (a) and "sea, ocean" (海) (marin).
 * His nickname Aqua means "water, sea-blue, one from water" in Latin.
 * The name is also associated with a blue-green color reflecting his eye color.
 * The romaji pronunciation does not follow traditional methods because Aqua's name is a kira-kira name, with 海 pronounced as "Marin" instead of "Umi".
 * Aquamarine's surname Hoshino means "star" (星) (hoshi) and "field, wilderness" (野) (no).

Film

 * That Was the Start
 * 15 Year Lie

Television

 * I'll Go With Sweet Today
 * We're About to Fall in Love for Real
 * Dig Deep! One Chance
 * Some unknown drama titles

Theater

 * Tokyo Blade
 * Unknown stage play title

Trivia

 * Everyone calls him "Aqua" because "Aquamarine" is too long.
 * Ai had one star in each eye, whereas Aqua inherited a star in his right eye while his sister Ruby inherited it in her left eye. After the revelation that his "father" was 'dead,' he lost the star, implying it is a feature dependent upon their emotional state.
 * Possibly due to memories from his past life, Aqua reveals that he can't really use technology as the youngsters do, nor does he understand the reason behind their popularity.
 * Aqua is constantly called and labeled a sis-con (a person with an extreme attachment to their sister).
 * Aqua starts high school at 16, a little after the first episode of We're About to Fall in Love for Real.
 * Aqua once admitted to Kana that he prefers women who are older rather than younger.
 * Aqua dislikes bell peppers.
 * Aqua is in class 1-D during his first year at Yoto High School.
 * Aqua spent over five million yen when trying to find out who his biological father is.
 * Aqua is shocked by Kana's comment that he looks gloomy; this wasn't something noticeable to him himself, although it is a common perception of him.
 * He is the only one of the main 4 cast members to be male, with all of the others (Ruby, Kana and Akane) being female.
 * Young Aqua is voiced by Yumi Uchiyama, who also voiced Rudeus Greyrat from Mushoku Tensei, a character who also died and was reincarnated in a young body.
 * Aqua manages to do a perfect vocal impression of Pieyon without Kana noticing the switch.

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