Maria Grace Fleed is a significant character in the anime series UFO Robo Grendizer. She is the younger sister of Duke Fleed, the protagonist of the series. Originally from the planet Fleed, Maria survived the destruction of her home planet and later joined her brother on Earth. She is a skilled pilot and becomes a crucial member of the team fighting against the Vegan Empire. Maria’s character is marked by her strong sense of justice and determination to protect both her new home and her brother from alien threats.