Hagoromo Ootutuki, also known as The Sage of Six Paths, is a character from the Naruto series who was a powerful priest and was known in legend as the God of Ninjutsu and the founder and father of the Ninja World. He was also the very first Jinchuuriki of the Ten-Tailed Beast.
The Sage was the son of Kaguya Otsutsuki, a princess who took power from the God-Tree and became near-omnipotent. Both he and his brother Hamura were born with an incredible amount of chakra as a result of their mother's actions and he was blessed with powerful ocular eyes called the Rinnegan which grants the user access to unique and powerful jutsus that are created from gods and godesses themselves. This made Kaguya angry, as she desired to be the most powerful being in the world.
According to legend, the Sage was an extremely powerful Ninja warrior with godlike powers who became the founder of the Ninja World. Because of endless wars and bloodshed that occured by people from the lands from around the world, the Sage desired to use his powers and wisdom to explain the truth about chakras and their abilities to bring peace among the lands. The Sage traveled around the world to spread his philosophy and religion which were eventually grasped by the people and became known as the Shinobi Sect or Ninjutsu and he was called by the people who desired peace as a Savior of the World.
Confronting the Ten-Tailed BeastThe Sage defeated the most powerful demon in the world called the Ten-Tailed Beast, which was actually the form his mother took when her power became unruly. He sealed the beast inside himself, becoming the very first Jinchuuriki. He was called a god because of his godlike abilities. Nearing his death, the Sage feared that once his death comes, the seal will break and the Ten-Tailed Beast will be released and wreck havoc in the world. To prevent this from happening, the Sage created a jutsu called the Creation of All Things which allowed him to divide up the Ten-Tails into nine individual beasts. He also used a Chibaku Tensei to seal the Ten-Tails' body (along with his mother's will) into a gigantic stoned prison which he hurled into the sky, creating the moon. He became a father figure to the nine young beasts, and gave names to each of the beasts and told them that even though they are separated, they will always be together, and when the time comes, they will become one again only to have different names and forms then what they were before they knew what true power really is.
DescendantsOn his death bed, the Sage had his two sons come before him whom he entrusted his powers, dreams, and legacy to to tell him what true peace is. The Older Brother born with the eyes of his father answered that power is the key to obtain true peace, while the Younger Brother born with his father's incredible physical powers, answered that love is the key to achieving true peace. Impressed by his younger son's answer, the Sage passed down his legacy to him and died. Angered that his father entitled his legacy to his brother, the Older Brother fought against his brother to obtain his leadership with their descendants continuing the feud down the line. Eventually, the Older Brother became the ancestor of the Uchiha Clan that are blessed with the Sharingan, while the Younger Brother became the ancestor of the Senju Clan that are blessed with powerful physical endurance.
Deus ex Machina
When the Sage's descendants Naruto Uzumaki and Sasuke Uchiha were near death, The Sage appeared to them in a realm beyond life and death. Knowing that the two of them had the best chance of cooperating and ending the cycle of hatred once and for all, he bequeathed to them two halves of his power so they could combat Madara Uchiha.
The Sage would later appear before the four Hokage. He offered to provide them with the means to save the world from his mother.