Sailor Galaxia emerges as Sailor Moon's strongest opponent in the manga Stars and in its anime counterpart, Sailor Stars. As such, she serves as the main antagonist in the above-mentioned story arc. As the self-proclaimed "Golden Queen of Shadow Galactica" she directly commands the Sailor Animamates. She is also described as the Soldier of Solitude. She aims to discover all the Sailor Crystals in the universe so that she can rule the universe unopposed. Galaxia's own crystal, the Saffer Crystal, is described as one of the most powerful Sailor Crystals in the galaxy.