TV-Series
Description
Princess Sapphire originates from Osamu Tezuka's creative work, directly inspired by the Takarazuka Revue tradition of actresses performing both male and female roles. This influence shaped her core identity as a character navigating gender fluidity within a medieval European-inspired fantasy setting.

Born in Silverland, Sapphire possesses both a blue "boy's heart" and a pink "girl's heart" due to a celestial error by the angel Tink. Her father, the king, publicly declared her male at birth to circumvent Silverland's law prohibiting female rulers, preventing antagonists Duke Duralumin and his son Plastic from seizing the throne. Consequently, she received training in swordsmanship, fencing, and horsemanship—skills typically reserved for princes.

Throughout her narrative, Sapphire maintains three distinct personas: the public identity of Prince Sapphire, required for royal succession; a hidden identity as a princess, facilitated by a blonde wig and gowns; and the masked vigilante "Phantom Knight," who combats injustice. Prince Franz Charming of Goldland interacts with all three personas without recognition, developing distinct relationships—friendship with the prince, romantic affection for the princess, and rivalry with the Phantom Knight.

Sapphire's development involves defending her right to retain both hearts despite Tink's mission to retrieve the boy's heart. She resists external forces attempting to control her gender identity, notably Satan Mephisto's schemes to steal her female heart for his daughter Hecate. Her story arc culminates in foiling Duke Duralumin's coup and defeating the proto-fascist ruler Mr. X, restoring peace to Silverland. Following her marriage to Prince Franz, she transitions into her biological female role publicly.

Beyond her original narrative, Sapphire appears across Tezuka's interconnected "Star System" works, often in mature or tragic roles reflecting societal pressures on women. In the "Black Jack" chapter "The Heroine of the Tunnel," she sacrifices her life as a kindergarten teacher to save students during a bus accident. Other "Black Jack" appearances depict her experiencing hardship, including periods as a socialite exploiting her beauty and later descending into vagrancy, emphasizing themes of female suffering.

A significant alternate timeline appears in the 1980 "Astro Boy" episode "The Time Machine." Here, Sapphire is a 15th-century Molavian prince raised male. After a life-threatening injury, surgeon Black Jack performs critical surgery. Recognizing Sapphire's forced male identity, Black Jack helps her publicly transition. The kingdom abolishes its male-only succession law, enabling her to rule as Princess Sapphire.

Sapphire's legacy includes becoming a mother in the sequel "Twin Knight," though details of this familial role remain unspecified. Her design innovations, particularly the large, starry eyes, established visual conventions for the shōjo manga genre.