Zero Two (Japanese: ゼロツー, Hepburn: Zero Tsū), also known as Code:002 or Nine Iota is a fictional character in Darling in the Franxx, a Japanese science fiction romance and action anime television series produced by CloverWorks and Trigger.[9] She was designed as the most prominent character and icon of the series. Zero Two is an artificially-created life form and elite pilot with an infamous reputation as the "Partner Killer" who aspires to become fully human. She is well known for addressing Hiro, the protagonist, by the eponymous term "darling".

Zero Two is considered one of the most popular characters of Darling in the Franxx and her personality has been well received by both fans and critics, with the latter typically citing her as one of the best aspects of the series