
Aqua Hoshino
From Oshi no Ko
Aqua Hoshino is a main character in Oshi no Ko, Ai Hoshino's son and Ruby's twin brother, a calm, calculating young actor who entered the entertainment industry to find the person behind his mother's death. He is voiced by Takeo Ōtsuka in Japanese and Jack Stansbury in English.
About Aqua Hoshino
Aqua Hoshino is Ai's son and Ruby's twin brother, and secretly the reborn doctor Gorou Amamiya, Ai's devoted fan. Calm, clever and calculating, he joins the entertainment industry for one reason: to find the person who leaked Ai's secret and had her killed. He treats acting as a tool for revenge, but the people he meets keep giving him reasons to live for himself.
Appearance
Aqua is a handsome teenager with dark blond hair and sharp eyes, his right eye carrying the same star-shaped sparkle as his mother Ai's. He is 172 cm tall, well-dressed and composed, with an actor's control over his own face, which is usually set in a calm, unreadable expression that gives nothing away. Next to his bright sister he looks almost gloomy, and that contrast is deliberate: Aqua prefers to be underestimated and unobserved while he thinks.
Personality
Aqua is calm, clever and calculating, with an adult's patience and a strategist's habit of treating conversations like chess. He is fiercely protective of Ruby and quietly kind to people in trouble, but he buries his own feelings under his mission and insists his life is only a means to an end. Acting does not come naturally to him the way it does to others, he works at it coldly, analysing emotion rather than feeling it, and his rare genuine moments on stage shock even him. Aqua's tragedy is simple: the closer he gets to the truth, the more he has to lose.
Background & Story
Aqua is Ai Hoshino's son, raised in secret alongside his twin sister Ruby by the Saito family at Strawberry Productions after their mother's death. A talented child actor from a young age, he grew up inside the entertainment industry, and with a purpose no child should have: finding the person behind the leak of Ai's secret and her killing. Aqua treats acting as a tool and connections as currency, carefully entering productions, agencies and circles that might hold a clue. What he did not plan for was the people: mentors like director Gotanda, rivals like Kana and Akane, and a sister chasing their mother's dream all keep giving the boy who lives for the past reasons to exist in the present.
Key Relationships
- Ai Hoshino: His mother, whose death defines his life and drives his search for the truth.
- Ruby Hoshino: His twin sister, whom he protects fiercely, including, when he thinks it necessary, from her own ambitions.
- Kana Arima: The former child star he has known since childhood; her honesty cuts through his defences like nobody else's.
- Akane Kurokawa: The actress he saved, whose genius-level understanding makes her his closest ally in the investigation.
- Taishi Gotanda: The director who first cast him and became his mentor in how the industry really works.
Quick Answers
What is Aqua's full name?
Aqua's full name is Aquamarine Hoshino, a flamboyant name from his mother Ai, shortened to Aqua by everyone.
Why did Aqua join the entertainment industry?
Aqua works as an actor while quietly investigating who was behind his mother Ai's death, using industry connections to hunt for the truth.
Who voices Aqua Hoshino?
Aqua is voiced by Takeo Ōtsuka in Japanese and by Jack Stansbury in the English dub.












