Kaguya Ōtsutsuki

Princess Kaguya Ōtsutsuki is the mother of Hagoromo Ōtsutsuki and Hamura Ōtsutsuki, who consumed the fruit of the Shinju and became the progenitor of chakra, and part of the creation of the beast that would become known as the Ten-Tails.  

Background: 

Kaguya is a princess who hails from an unknown distant land, and had lived long before the founding of the hidden villages, during an era of endless wars between mankind. Longing for peace, Kaguya decided that it was necessary for her to attain god-like powers in order to put an end to all conflicts. For this reason, she defied the taboo of consuming the fruit of the Shinju, becoming one with the holy tree's power. For her deed of single-handedly ending the wars, Kaguya was worshipped as the Rabbit Goddess. As time passed, however, the power she held ultimately corrupted her, and Kaguya sought to prevent humanity from causing any further harm to the world by trapping them within the Infinite Tsukuyomi, and converted the victims that were assimilated by the Shinju into White Zetsu.

This and the other horrifying acts Kaguya committed struck terror into the hearts of the then-powerless people around her, for which she would be feared as the Demon. Kaguya later gave birth to two sons: Hagoromo and Hamura, both of whom inherited the same powerful chakra she wielded and unique dōjutsu along with it. Angered at the power gained by her children, Kaguya and the Shinju melded into an entity that would later become known as the Ten-Tails with one singular goal: reclaim the chakra she felt was rightfully hers. The Ten-Tails rampaged throughout the lands until Kaguya's sons defeated, and sealed the beast and their mother away. Before her sons could completely seal her, Kaguya's will manifested in the form of Black Zetsu. This manifestation would soon begin its machination to revive Kaguya.

Personality:

After obtaining the ability to manipulate powerful chakra from the Shinju's fruit, Kaguya developed both a god-complex and messiah-complex, believing that chakra rightfully belonged to her alone and that only she could protect and unite the world. Despite her initial desire for peace like her sons and grandsons, Kaguya opted to use her great and terrible power to submit everyone to her will. As Hagoromo noted, humanity around that time began to fear her as a demon. She uses the archaic pronoun "warawa" when referring to herself  a sign of ancient nobility. Kaguya also displays a degree of affection, as she appears to care very deeply about the world, viewing it as a nursery that she didn't want humanity damaging any further.  

Appearance:

A woman in possession of very delicate facial features, Kaguya also had an extremely long, sweeping light coloured hair that touched the ground. Most noticeable were two horn like protrusions which stuck out from her head — appendages inherited by both her sons. Kaguya possessed the Byakugan, and also had a third eye on the centre of her forehead that's eyelids parted vertically. Her eyebrows were cut very short — a symbol of nobility, and she wore a dark shade of lipstick on her lips and a dark shade of nail polish on her long fingernails. She wore the transitional high-collared hime-kimono which was adorned with intricate lines and tomoe running down the centre and edges of the gown.  

Abilities: 

Kaguya wields the Byakugan in both eyes, granting her near 360° vision (with the presumed exception of a small blind spot at the upper thoracic vertebrae that all wielders possess), x-ray vision and the ability to see the chakra pathway system. Her sight with the Byakugan was also able to bypass the defence of Susanoo. In conjunction with her hair, Kaguya is able to see the individuals' vital points, accurately piercing them in order to immobilise them completely.
Rinnegan

Kaguya wields her Rinnegan as a third eye on her forehead, which is red in colour and contains several concentric circles and nine tomoe. Her third eye also grants her the Sharingan's powers, such as seeing the flow of chakra, casting and easily recognising genjutsu, heightened powers of perception as well as the ability to copy techniques. The eye once enabled, allowed Kaguya to cast the Infinite Tsukuyomi.

With her third eye, Kaguya is also able to instantaneously teleport herself and others around her to a different dimension, while simultaneously erasing the presence of their chakra. Similarly, Kaguya is able to open and travel through rifts in space as a means of instantaneous travel.
Shikotsumyaku

Kaguya's usage of Shikotsumyaku. Kaguya's shown the ability to manipulate and by extension weaponise her own bone structure, enabling her to have a vast array of battle options without any need to carry weapons on her body. With one such technique, she is able to launch her bones like a projectile, disintegrating whatever she impales.