Hoppou Seiki, also known as the Northern Princess, is a significant enemy character in the world of Kantai Collection. She is part of the Abyssal Fleet, an antagonistic force that threatens humanity's naval forces. Despite her childlike appearance and demeanor, Hoppou Seiki possesses formidable strength and commands an impressive fleet of Abyssal ships. Her character often evokes a mix of fear and sympathy due to her innocent looks coupled with her destructive capabilities. In the series, she plays a central role as a formidable adversary that the protagonists must confront and overcome.