Benisuzume Shinatose is a mysterious and formidable character in the anime series 'Sidonia no Kishi' (Knights of Sidonia). Once a human named Shizuka Hoshijiro, she is transformed into a Gauna-Human hybrid by the alien Gauna after absorbing Hoshijiro's memories and appearance. As Benisuzume, she becomes a recurring antagonist, posing a significant threat to Sidonia and its pilots. Her existence embodies both tragedy and danger, challenging the protagonist Nagate Tanikaze with her uncanny resemblance to his lost friend.