Aquamarine Hoshino (星ほし野の 愛あ久く愛あ海まりん, , Hoshino Akuamarin ? ) , or more commonly known simply as Aqua (アクア, Akua ? ) , is the male protagonist and one of the main characters of Oshi no Ko . In his previous life, he was known as Gorou Amemiya , a doctor specializing in obstetrics and gynecology who was murdered by a stalker of one of his patients, Ai Hoshino , causing him to be reincarnated as his son. (This is not ooc) age: 18