Celestial Beings

Celestial Beings (天津人, amatsuhito) are a race of extraterrestrial humanoid like beings that have existed for millennia that travel from planet to planet to plant God Trees to obtain powerful chakra from the fruit they bare. They primarily make up the Ōtsutsuki Clan.

Appearance
They have chalk white skin, pale blue hair (males) or white hair (females), eyebrows shaved into 2 small dots, and some kind of horns growing out of their heads, and pupil-less lavender eyes. Hybrids of the alien race and humans have horns connected to their heads that appear to be apart of their flesh, with more fair skin and a more variety of hair colors.

Abilities
All Ōtsutsuki have possessed at least one inborn skill, the Byakugan being the most prevalent ; while Kaguya has the Rinne Sharingan and a predecessor ability of the Shikotsumyaku; Momoshiki had the Rinnegan. Members of the race were also seen to use Yomotsu Hirasaka.

History
For countless eons, thecelestial beings have been travelling throughout dimensions seeking out worlds cultivated with the God Tree. Once they find such a world, they harvest the god trees' fruit so that they can use its chakra to gain power and prolong their lives. In the case of Momoshiki, Kinshiki, and their ancestors, they would remain on a world until the God Tree was dead and the world could no longer support life, at which point they would seek out a new one.

At the time Kaguya was the clan's leader, she arrived on Earth with the clan. Eating the planet's Chakra Fruit, Kaguya used the chakra she gained and the Infinite Tsukuyomi to end the constant war of Earth's human population, resulting in world peace and her being viewed as a benevolent deity. Foreseeing clan members coming to Earth to steal her chakra, she converted the imprisoned Infinite Tsukuyomi victims into a White Zetsu Army in preparation for their arrival. The act lead to humans viewing her as a demon.

In time, Kaguya gave birth to twin sons, Hagoromo and Hamura, both of whom were born with chakra of their own. Kaguya grew jealous that they inherited some of her power and so merged with the Earth's God Tree to try and take it back, in the process becoming a monster called the Ten-Tails. The beast terrorised the world until Hagoromo and Hamura defeated it with their Six Paths — Chibaku Tensei, thus creating the Moon. The Ten-Tails' chakra was sealed into Hagoromo while its husk, the Demonic Statue of the Outer Path, was hidden away and sealed on the Moon, in order to prevent the Ten-Tails' revival. Leaving leadership of the clan to Hamura, he decreed that the clan would stand guard over the Demonic Statue. Immigrating the clan to the moon, his direct bloodline and Hagoromo stayed on Earth, the former which inherited the Byakugan and became the Hyūga clan. The Moon settlement would go on to implement the custom of newborn members having their Byakugan taken and put into the Tenseigan to power it, which Hamura used to bring order and stability to the world of the Moon.

Believing chakra was a power that linked everything in the world, Hagoromo set out to spread the message to the people of the land, during which his teachings became known as ninshū. Towards the end of his life, he divided his chakra into the nine tailed beasts, his way of ensuring that the Ten-Tails and thus Kaguya would never be reborn. Before he died, he passed over his eldest son, Indra, and entrusted his mission of peace to his youngest son, Asura. Having spent the remainder of his life overlooking Earth, Hamura entrusted his fellow Ōtsutsuki with watching over humanity before passing away. Afterwards, the people of the moon treated Hamura's Tenseigan as a treasure, leading to them enshrining it as a religious object and devoting a plan to eternally preserving it.

The millennium that passed involved the Moon's branch family misinterpreting Hamura's celestial decree, leading to them believing he wanted his descendants to destroy Earth in the event the world Hagoromo fashioned lead astray. The main family warred against the branch family over their different interpretations and eventually annihilated the former using the Tenseigan. On Earth, humans along with Ōtsutsuki's descendants such as the Senju, Uzumaki, Uchiha, and Kaguya clan utilised Indra's invention of ninjutsu to shape the shinobi world.

A thousand years after the Ten-Tails' defeat, the Moon's branch family dwindled to only Toneri, who was aware that the Demonic Statue was stolen and the Ten-Tails was revived during the Fourth Shinobi World War. The event ultimately lead to Kaguya being temporally revived, but was soon sealed in another dimension by the reincarnations of Asura and Indra. Two years later, as his clan had concluded that Earth's shinobi will destroy the world's peace and order, he deemed Hagoromo's world a failure, and began to act on Hamura's mistranslated celestial decree. Unable to reach an agreement with the Hyūga Clan, Toneri resorted to kidnapping the clan's heir and taking her Byakugan in order to awaken the Tenseigan. The act caught the attention of Konohagakure, leading to a team discovering his intentions and defeating him. After becoming aware of Hamura's true decree, he vowed to remain in self-imposed exile on the Moon in order to stand vigil over the Earth as a solitary guardian.

Years later during the Seventh Hokage's era, Momoshiki and Kinshiki in another world became aware of abnormalities in Kaguya's world, prompting them to inform their clan and investigate the situation. Though they weren't aware of the fate of Kaguya or her chakra, by Urashiki's account they saw everything including the Byakugan Princess incident on the Moon. During Konoha's investigation of Kaguya, they had discovered four separate Ōtsutsuki clan ruins.