[OSHI NO KO] 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, 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.