There’s something almost mythic about the reveal of the sage — it hits that sweet spot between folklore and cosmic sci-fi that made me fall in love with 'Naruto' all over again. For me, the true identity of the Sage of Six Paths is Hagoromo Ōtsutsuki: the son of Kaguya Ōtsutsuki and the brother of Hamura. He’s the one who first understood chakra as something you could shape, share, and use to connect people, and he’s the origin point for a lot of the series’ major traditions and conflicts. He’s not just a mythic founder; he’s the literal bridge between the godlike Ōtsutsuki legacy and humanity.
Hagoromo becomes relevant in the story when he and Hamura confront their mother, Kaguya, after she becomes the Ten-Tails. To stop her, Hagoromo actually becomes the Ten-Tails’ jinchūriki himself at a point, gaining the power he needs to reseal the beast and then split its chakra into the tailed beasts. That act — splitting the Ten-Tails' chakra into nine separate beings — is what sets up the whole chakra/tailed-beast dynamic for generations to come. He also taught people ninshū, which later evolved into what we know as ninjutsu and eventually gave birth to rival philosophies in his sons Indra and Asura. Those sons are important, because their reincarnation cycle (Indra → Uchiha line, Asura → Senju/Ōtsutsuki line) echoes through the whole series.
People sometimes treat Hagoromo like a pure benevolent sage, but his story is messier: he’s a godlike figure who had to make brutal decisions, and his legacy becomes political and spiritual baggage for his descendants. In the literal lore, he’s part of the broader Ōtsutsuki clan origin — Kaguya ate the chakra fruit from the God Tree (brought by an Ōtsutsuki), and Hagoromo inherits that chakra lineage. So if you dig into the later parts of 'Naruto Shippuden' and the follow-up world-building in 'Boruto', you see that Hagoromo’s identity ties directly into the series’ shift from mystical folklore to an interstellar family saga.
On a personal note, the scene where he appears to Naruto and Sasuke and gives them the Six Paths power still gives me chills: it’s both a moment of literal power-up and a symbolic passing of a torch. For casual viewers, he’s the ancient god who started everything; for lore junkies, he’s the tragic progenitor whose choices echo for centuries. Either way, Hagoromo Ōtsutsuki is the core answer — complex, important, and beautifully built into the series’ themes about power, responsibility, and legacy.