Steela Gerrera was a female human who lived on Onderon during the Clone Wars. She fought with the Onderon rebels, and was their leader, nominated for the position over her brother Saw Gerrera. The efforts of her movement, with assistance from the Jedi, saw the end of Separatist rule on Onderon. Steela was killed in the final battle and was mourned as a hero of her people.
Saw blamed himself for his sister's death and it haunted him for years after, especially after the victory was rendered meaningless after the Empire took over. The only thing he had left of his sister was a holoimage of her, which he dropped on Geonosis after restraining Klik-Klak; it was recovered by Ezra Bridger and returned to him.