Naoko Takeuchi
is an orange-haired human-like female alien and the main villainess of the fifth story arc. She is the self-proclaimed "Golden Queen of Shadow Galactica", and is also described as the Guardian of Solitude. According to Naoko Takeuchi, Galaxia was created as a Sailor Guardian "to rival Sailor Moon", and her golden uniform and costume was described by her as very difficult to draw.