Astolfo, known as the Rider of Black, is a fictional character from the anime series Fate/Grand Order. They are a Servant originally summoned in the Great Holy Grail War, appearing as a member of the Black Faction. Astolfo is a playful and carefree character known for their cheerful demeanor and optimism. Despite their whimsical nature, they are fiercely loyal and possess a strong sense of justice. Astolfo's role in the series involves aiding the protagonist in battles and offering valuable support, often using their Noble Phantasm, La Black Luna, to great effect.