Gamamaru

He is one of the largest inhabitants of Mount Myōboku, easily equalling Bunta, Ken, and Hiro in size. He is brown in colour, with a white belly, is very wrinkled and has taken to squinting. He wears a professor's hat with tassels and an orb on top of it. He also wears a necklace with the toad's village symbol for "oil" (油, abura) on it. The place where he called Jiraiya and Naruto to receive their prophecy is lined with what appears to be giant scrolls and he sits in a shallow pool of water which has the kanji for "sage" (仙人, sennin) inscribed on it.

In the anime, over a thousand years ago, Gamamaru was a witness to Kaguya Ōtsutsuki's enslaving the land via the Infinite Tsukuyomi. Years later, Gamamaru approached the princess' twin sons, Hagoromo and Hamura Ōtsutsuki. He revealed to them the sinister nature of their mother's regular ritual to the God Tree, urging them to seek out the truth. Once the twins learned about the people being offered to the tree, they sought out Gamamaru to hear the whole truth about their mother's actions and the dangers posed by the God Tree, as it was continuously draining Natural Energy from the world, depleting the supply. Ultimately, the twins asked Gamamaru to teach them senjutsu, which he intended to do from the start. As Hagoromo finished his training in senjutsu, a messenger toad came to inform him and Gamamaru of Hamura's sudden disappearance, speculating that Kaguya discovered their plan. Upon returning the village and evacuating the people for the impending battle, Gamamaru gave Hagoromo a final gift, a sacred seal tag created by the Sage Toads over the centuries that could revive anyone from near death once. From a distance, Gamamaru then watched as Hagoromo confronted Kaguya only to have to fight a brainwashed Hamura. To Gamamura's surprise, Hagoromo chose to fatally wound Hamura to free him from Kaguya's control before using the seal to save him. This impressed Gamamaru, as it also awakened Hagoromo's Mangekyō Sharingan and Rinnegan. Several years later, Gamamaru gave Hagoromo a prophecy, stating that a "mischievous blue-eyed boy" would unite the tailed beasts and change the world. Years later, Gamamaru approached Hagoromo again after he sent his two sons, Indra and Asura Ōtsutsuki, on separate missions to determine the successor for Ninshū. When noting the two siblings' respective development, he asked Hagoromo what he hoped to gain from this. To which, Hagoromo noted how differently his sons developed, hoping that the journey would help each of them become better balanced by improving where they were found lacking: Indra in compassion and Asura in strength. As time passed, Gamamaru would often meet with Hagoromo to discuss his plans for his sons. While respecting Hagoromo's request to not interfere, Gamamaru would still watch from afar to see how the two brothers matured. Centuries later, when Jiraiya was training at Mount Myōboku, the now-elderly Toad Sage made a prophecy concerning him: Firstly, that he would go on to become both a talented ninja, and a pervert without equal. Jiraiya would walk across the world as a sage, "observing all creation, watching as nature takes its course", and in doing so he would also write a book. Jiraiya was also told that he would one day have a student with the power to save or destroy the world, and that it would be Jiraiya's actions that will determine which path this student takes.