Altessa

Altessa is the princess of the Jewelry Kingdom inside the Mysterious Planet, younger sister of crown prince Bright. She is somewhat conceited and demanding, and often gets frustrated with the other royal children. Despite her snobbish nature, Altessa is deeply attached to her elder brother. In the second half of the first series, Altessa joins Fine and Rein in their quest to save the Mysterious Planet after her brother is assimilated by the dark force Chancellor Roman tries to use to destroy the planet.