Sailorgalaxia
Galaxia is PURE evil. The great evil force of Chaos inhabits her body. Galaxia thought since she was so powerful, she could seal Chaos in her. But Chaos was too strong, so she sent her starseed to the beautiful suited soldiers of justice. (the starseed became Chibichibi). Afterwards the evil force took over Sailorgalaxia completely and began stealing the galaxies' starseeds.
In the beginning of Sailormoon Sailorstars, she was the one that frees Nehelenia. She also attacked Mamoru's plane, while he was on his way to Harvard. She is so powerful that she has taken over a whole Universe, except for our Solar System. She is the Sailor senshi of the Galaxy. At the end of the series, Sailormoon breaks the evil force away from Galaxia, and she's free. Sailorgalxia then flies away bringing the lost star seeds to their original owners.