She is Seven Barian  Emperors member. But she was "Rio Kastle", the human. and she have a older brother, "Nash". Nash was human too. And Nash's human name was "Reginald Kastle". She feels that she shares her destiny with Nash. But when she and Nash were human, they were friend Yuma and Kite Tenjo. But they bugun enemy with Yuma and Kite Tenjo, and Astral. She knocked down Bronk Stone, Yuma's friend. But Vector, Barian Emperor, betrayal she and Dumon and her, and she's soul was absorbed Vector.