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 main protagonist and one of the titular characters of the 'Oshi no Ko' manga series. He was previously known as Gorou Amamiya, a medical doctor specializing in pregnancies who was murdered by a stalker of one of his patients, idol Ai Hoshino, and reincarnated as said patient's child.

Having been an orphan and a fan of Ai in his previous life, he genuinely enjoyed being her child, with his wit and conversational skills causing him to get involved in the entertainment world from a young age. Unfortunately, this happy life was stripped from him after the same stalker who killed him in his previous life murdered his new mother as he watched. This event fundamentally changed him, swearing vengeance on the one who sold Ai out, his own father, and journeying down the dark side of the entertainment world to find him.

Appearance
Aqua has blonde hair and is relatively tall. He has blue Aquamarine eyes, which is what his mother named him after. He often changes his appearance due to his job as an actor. He is described as "handsome" and features a star in his right eye, symbolizing that he and his sister are halves of their mother. When he was a child, he 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, prior to 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. 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 mom(Ai), he changed. -- becoming cold, calculated, cunning, and discreet, he would do anything to find the man who killed his mom; A man willing to do whatever means necessary to see his goals through. The pain he underwent 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. He was able to make use of these negative emotions, however, 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, and is mostly 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 their mother's footsteps. In the end, he helped Ruby and the new B-Komachi group in preparing 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.

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, which reflects his eye color.
 * Aquamarine's surname Hoshino means "star" (星) (hoshi) and "field, wilderness" (野) (no).

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 unusually strong attachment to their sister).
 * Aqua spent over five million yen when trying to find out who his biological father is.
 * Aqua dislikes bell peppers.
 * Aqua is in class 1-D during his first year at Yoto High School.
 * Because Aqua gets acquainted with many female seniors (Kana, Akane, Mem-Cho...), Ruby thinks his type is older women.
 * 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.

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