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"Guarded by Neptune, planet of the deep blue sea. I'm the soldier of affinity, Sailor Neptune!"
— Sailor Neptune's stock introduction

Sailor Neptune (♆) is one of the four Outer Senshi of the Solar System, and was the ninth Sailor Senshi to be intoduced in the manga. Her civilian identity is Michiru Kaiou. Her attacks are based around the ocean or sea, precognition, and powers granted by her mirror. This is the original depiction of the character created by Naoko Takeuchi.



Sailor Neptune's fuku consisted of a white leotard with a sea-green skirt, a navy-blue front bow, and a navy-blue back bow. The collar on her leotard was sea green and it did not have any stripes on it, and her shoulder pads had three layers. Her gloves were white with sea-green wrist fittings. She wore sea-green high heels with straps that criss-crossed (like ballet slippers). Her accessories were a gold tiara with a sea-green gem in the middle, her earrings were white studs and had some kind of planetary object surrounded by a ring dangling from them, and a sea-green choker with a sea-green gem with golden accents attached to it.


Infinity arc

Dream arc

Stars arc


Transformation Phrases and Items

Weapons and Items



Sailor Neptune's character was not developed until partway through the Sailor Moon series, after the other Guardian Senshi had already been established. When she was created she was made along with Sailor Uranus, the pair was meant to be "complementary but opposite characters", and were meant to work along with Sailor Pluto from the beginning. Sailor Neptune's visual design is made to evoke images of her element, the ocean. The choice of her colours along with the wavy quality of her hair, which Takeuchi even joked, might be thought of as seaweed hair.


  • In Roman mythology, Neptune is the god of the sea.
  • She, along with the other Outer Senshi, possess one of the Talismans needed to summon the Holy Grail and awaken Sailor Saturn .
  • Sailor Neptune is one of the only Senshi (besides Sailor Mars) who possess psychic abilities and the only Outer Senshi to do so.
  • Sailor Neptune and Sailor Uranus are the only members of the Sailor Senshi who's backstory of becoming a Sailor Senshi had never been revealed in the manga.
  • Sailor Neptune is killed and is given bracelets from Galaxia in the manga, but in the anime she voluntary "sells her soul" to Galaxia and is given bracelets.


Sailor Senshi

Solar System Sailor Senshi Sailor MoonSailor MercurySailor MarsSailor JupiterSailor Venus / Sailor V
Other Sailor Senshi Sailor Luna
Civilian Identities Usagi TsukinoAmi MizunoRei HinoMakoto KinoMinako AinoLuna Tsukino
Allies Tuxedo MaskLunaArtemis

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