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Sailor Cosmos is a Sailor Senshi who appears in the last two acts of the manga. She comes from a distant future, where all was destroyed, due to the battle with Chaos. After a long time fighting, she fled to the past in the form of Chibi Chibi to encourage Eternal Sailor Moon to defeat Chaos in the final battle of the series.
Sailor Cosmos only appears in the last arc of the manga.
Sailor Cosmos comes from a far distant future where Chaos has been reborn as Sailor Chaos. There is not much stated about the battles only that Cosmos had fled because already too much had been lost and for her, to continue fighting was no longer worth it.
She flees through time and disguises herself as Chibi Chibi in order to get close to her past self.
Sailor Cosmos has white hair that is put up in heart-shaped odangos. Her dress resembles a sailor fuku and it has a white collar, short yellow sleeves with wings, and multicolored ribbons in the middle of the skirt underneath a broach that looks like the broach that she wears below her collar. Both of the broaches have a yellow star on them and wings attached to the right and left sides, with the broach above the multicolored ribbons having two white ribbons coming out of it. Her footwear consists of white high-heeled shoes with wings. Additionally, her accessories consists of the aforementioned broaches, white rings on each of her fingers (except for her thumbs), white earrings, a tiara with white beads and a yellow star in the middle, a white choker with a yellow star in the middle, white barrettes, and white and yellow circular odango covers. She also dons a long white cape.
Sailor Cosmos is said to have the Lambda power, a power she holds even when she was Eternal Sailor Moon. It is described as the ability to lose everything so that she can save everything. This can be interpretted in many ways.
We see her use many powers but she does not utter any incantation or phrase to activate them, like we see other senshi do at times, so the true scope of her abilities are widely unknown.
We see she has the ability to create an umbrella and fall through the air. This is how Chibiusa had once traveled to the past from the future. It is later confirmed that she comes from a far distant future past that of Crystal Tokyo. However, if she used the Gates of Time, it is odd that she could go unnoticed to either Sailor Pluto, the true Guardian of the Gates of Time or Diana, who watches the gates in Pluto's abscene.
- Extending on her time abilities, she effortlessly sends the Sailor Senshi Amazoness Quartet back to the future with a swipe of her staff.
During the battle with Galaxia and Usagi, in her ChibiChibi disguise she is able to throw up a strong barrier, much like Saturn's Silence Wall technique and is able to effortlessly support and protect Usagi during the attack. She even is able to assist Usagi who is unconscious into summoning her Eternal Tier as if she knew how to do so with ease.
- Able to foresee the nearable future, or a very heightened sixth sense she was able to manipulate an event to her liking like the instant she helped Chibiusa, and her team reach their exact location right in time. Whatever the case may be, she was seemed aware of Chibiusa and the Amazons arrival and attack before any one else and this is confirmed when Chibiusa thanked her for calling out to them in time.
- Sailor Cosmos is the last Sailor Senshi to appear.
- Sailor Cosmos does not appear at all in the anime, though many fans have mistaken a screenshot silhouette of the Light of Hope for Sailor Cosmos.
- In an issue of Smile magazine, Naoko said that Chibi Chibi is the future Sailor Moon. Since Chibi Chibi is actually Sailor Cosmos, this could mean that Sailor Cosmos herself is actually the future Sailor Moon. Despite this, many people have many theories as to who Sailor Cosmos is.