It’s the lustful sage Jiraiya! This was already hinted at by Jiraiya. The son of the prophecy is definitely a disciple of Jiraiya, and there are three disciples of Jiraiya. Namikaze Minato, Pain trio, Naruto. Originally, the child of prophecy was thought to be Namikaze Minato (Fourth Hokage). After Minato died, he was suspected to be Rinnegan Payne, but Payne went the wrong way and was finally convinced that it was Naruto. Jiraiya said something to Kakashi: I didn't expect that the son of prophecy would be "inherited from one generation to the next"! The intergenerational inheritance here implies that Jiraiya is Naruto's grandfather or grandfather. Judging from the hair shape, Jiraiya's hairstyle is very similar to Namikaze Minato, only the hair color is different. He concluded that Jiraiya was not his grandfather, but his grandfather.
But judging from the conditions for Grandpa Toad to practice immortality. Jiraiya possesses huge chakra, and huge chakra is the characteristic of the Uzumaki clan. Namikaze Minato also possesses huge chakra, but has not practiced senjutsu. Judging from the color of their hair, Jiraiya and Minato are not red. They should be collateral descendants of the Uzumaki clan, rather than direct descendants. The Uzumaki clan should have non-direct descendants, and the Uzumaki name must be concealed.
Since Naruto is the successor of Asura, it means that Namikaze Minato's ancestors were also inherited from the Sage of Six Paths. There are no restrictions on close relatives marrying in the world of Naruto. Hinata is descended from the lineage of the Six Paths Sage's younger brother. Therefore, Boruto's ability is closer to Kaguya Otsutsuki, but Boruto did not inherit the huge chakra of the Uzumaki clan! Kaguya Otsutsuki didn't have a huge chakra set originally. It was after eating the forbidden fruit of the sacred tree that she became possessed of powerful chakra. It’s okay for Boruto to be called Boruto Otsutsuki, so Boruto can be resurrected by Otsutsuki Iski!