Sailor Galaxia is one of the 5 major villains in the Sailor Moon series and the main villainess of the final arc, Sailor Stars.
Hundreds of years before the start of the series, Sailor Galaxia was born in a small asteroid she deemed trash. Upon awakening to her senshi powers, she left her home to explore the universe, eventually coming across chaos disguised as Wiseman, who deceived her into believing that in order to achieve true happiness she would require to gather all the Sailor Crystals in the universe and use them to conquer the Galaxy Cauldron, birthplace of all stars.
Thus Sailor Galaxia set out to invade and destroy all planets that could harbor intelligent life, recruiting traitorous humans and senshi as part of her army, granting them life through her golden bracelets, bestowed upon her by Chaos.
Arriving Earth, home of the strongest Sailor Crystal of all, the Silver Imperium Crystal, Galaxia unleashed her minions who quickly disposed of the local senshi as well as the refugee senshi from the planet Kinmoku, and was only defeated when Sailor Moon taught her that the way towards true happiness comes from love and friendship and not power; her betrayal prompted Chaos to remove her bracelets and burn her to death in the cauldron.
Sailor Galaxia was the most powerful senshi in the universe, tasked with the burden of fighting Chaos for all eternity. In a moment of desperation she sealed Chaos within her own body in an attempt to prevent it from ever coming back, but was soon overtaken by it. Before losing her body entirely, she freed her Star Seed into the universe in the form of a crimson butterfly and advised it to find a person worthy of wielding it against her corrupted self.
The infected Sailor Galaxia then started invading and destroying planets across the universe in an attempt of smashing any form of dissatisfaction or rebellion, brainwashing true senshi into serving her cause and stealing True Star Seeds for her personal collection.
Eventually she arrived Earth and after several weeks of futile battles between her servants and the local senshi she became inpatient and launched a massive attack on mankind stealing all Star Seeds in the planet and slowly taking out the senshi of the Solar System.
Sailor Galaxia was almost defeated by the Sailor Starlights and Sailor Moon, so Chaos unleashed its true self and attacked them. Aided by Galaxia's Star Seed, Sailor Moon triumphed over Chaos by using her Star Seed to make up the galaxy shine and cleansed Sailor Galaxia returning her to her original, gentle and just self.
In her true form, Galaxia has long, wavy, golden orange hair. She wears a soft lime green dress that reaches her feet.
In her sailor form, her uniform isn't the same as the other sailor senshi in the anime and manga. Her sailor uniform is pure gold with a gold head dress. As Sailor Chaos, her uniform and head dress turn black. Her skin turns light purple, and her lipstick turns dark purple.
She wears orange lipstick and light purple eye shadow and has brown eyes.
As the strongest of the Sailor Senshi, Galaxia was capable of extreme feats of power. Galaxia could fire blasts or beams of energy with her bracelets. Release golden colored lightning from her hand, along with controlling the dark lightning she gains from her aura. Like Sailor Saturn, she could destroy planets with ease and she was fast enough to battle the Starlights throughout the entire galaxy and the space around it in a few moments. Not only that, they apparently destroyed several planets and stars by accident during the clash, with explosions being seen destroying several star systems.
- Energy Blasts - Galaxia could fire out razor edged energy blasts toward an enemy. And when she simply wanted to cause damage to them, she could also fire out several beams of her energy at them. This attack is referred to as Energy Beams.
- Golden Lightning - Out of her hand, Galaxia could release streams of golden lighting at anybody who angered her or pissed her off for unknown reason. This attack is referred to as Golden Thunder.
- Dark Lightning - Galaxia had the ability to manipulate the dark lightning created by her aura. Even being able to fire it out of her sword if she needed. This attack is referred to as Dark Thunder.
- Magic Barriers - In her struggle with the Starlights, Galaxia put up an invisible barrier against their energy attacks.
- Energy Waves - Galaxia could launch waves of energy at an enemy just by swinging her sword at them.
- Repelling Force - She can send blasts of repelling force into her enemies.
- Energy Balls - When Galaxia wanted to simply damage an enemy, she could fire out a ball of pure energy into them.
- Bracelets - Sailor Galaxia could fire blasts of pure energy from her bracelets that would remove a person's star seed, thus destroying them entirely.
- Energy Whip - Sailor Galaxia once used a glowing golden whip to strike down Super Sailor Uranus and Super Sailor Neptune in Episode 197.
- Sword - When full taken over by Chaos, Sailor Galaxia possessed a sword of evil power, which strongly resembled the mystical Sword of Sealing used by Princess Serenity.
- According to Sailor Moon producer Naoko Takeuchi, contrary to popular belief, Sailor Galaxia doesn't possessed the demonic powers.