Man, talking about the version of Naruto that carries the Sage of Six Paths energy gives me goosebumps every time. For me the single jutsu that most defines his fighting style in that phase is the Six Paths Senjutsu — often called Six Paths Sage Mode — combined with the Truth-Seeking Balls. That combo is the real orchestration behind everything he does: the way he nullifies enemy ninjutsu, shapes attacks on the fly, and kind of turns chakra fundamentals into sculptable tools. Watching him go from standard Rasengan spam to molding massive, planet-level chakra constructs felt like watching a player-level up mid-boss fight in an open-world game; suddenly the toolkit is completely different.
Six Paths Senjutsu is less a flashy one-off than a whole system upgrade. It gives Naruto access to yin–yang release properties (healing and creation/annihilation vibes), heightens his sensory range, and lets him infuse physical strikes and Rasengan variants with that unique Six Paths chakra. The Truth-Seeking Balls are the tangible signature: black orbs made of all five natures plus yin–yang chakra that can disintegrate and nullify other ninjutsu. He reshapes them into shields, spears, or a swarm of tiny nullifiers depending on the fight, which is why I always say the balls are his stylistic fingerprint. In the final arc of 'Naruto Shippuden' you can actually see how his tempo and spacing change — he's thinking a few steps ahead because those orbs force opponents into very limited options.
If you want an action scene that highlights this, rewatch the moments against Obito and Kaguya. The choreography shows how the Six Paths energy isn't just power but also control: buffing durability, granting flight, and letting him link Kurama’s power seamlessly. For me the emotional hook is how that mode feels like a passing of a torch — it’s ancient-scale power in a character who still fights like a stubborn, hopeful shinobi. So yeah, if I had to name one defining jutsu? It’s the Six Paths Senjutsu system and the Truth-Seeking Balls that come with it. They reshape his whole approach to combat and make him feel like a different beast compared to earlier arcs, in the best way possible.