If there’s one power debate guaranteed to split any group of Naruto and Boruto fans in seconds, this is it. Kaguya Otsutsuki closed out Naruto Shippuden as the ultimate villain, the threat that needed the combined powers of nearly the entire reinforced Team 7 just to be contained. Years later, Boruto: Naruto Next Generations introduced Isshiki Otsutsuki, and with him, an uncomfortable question: what if that “ultimate villain” was never actually the strongest member of her own clan?
Let’s get the spirit of the answer out of the way before diving into the details: logistically and narratively, one of them clearly has the edge. But how that edge got established — and what actually happened during their direct confrontation, long before the story we know — hides a twist that completely changes how we should read this rivalry.
The Historical Fact: How Did Kaguya “Defeat” Isshiki in the Past?
The argument most often cited by people who back Kaguya as the stronger Otsutsuki is simple: she literally split Isshiki’s body in half and left him on the brink of death. That’s not nothing — on the surface, it looks like the kind of feat that should settle the debate right there.
But there’s one crucial detail about that fight that flips the whole interpretation on its head. Both the manga and the anime make it clear that Kaguya didn’t beat Isshiki in a direct, face-to-face duel — she stabbed him in the back, catching him completely off guard, giving him zero chance to react. This wasn’t raw power overwhelming raw power; it was a calculated betrayal, pulled off by someone who knew her partner’s routines and blind spots intimately. And that choice alone — attacking from the shadows instead of challenging him openly — tells you everything: Kaguya knew exactly what kind of threat Isshiki represented, and she knew she’d have no chance at all if the fight happened on fair terms.
The Otsutsuki Clan Hierarchy
To understand why that betrayal was necessary in the first place, it helps to look at how the Otsutsuki clan itself was structured. Clan tradition had its members travel in pairs, made up of a “Master” and a “Servant” — a rigid hierarchy, not a partnership of equals.
Within that system, Isshiki held the senior position, while Kaguya was the lower-ranked subordinate. That hierarchy carried a brutal consequence: according to clan tradition, the lower-ranked member — in this case, Kaguya — was eventually meant to be sacrificed to feed the Ten-Tails, serving as fuel for the clan’s larger mission. That’s exactly the fate the story suggests pushed her into the surprise attack: not rebellion born from pure ambition, but a desperate attempt to escape a role that treated her as disposable. And that hierarchical detail is revealing on its own — originally, it was Isshiki whom the clan itself considered the more valuable, more powerful half of the pair.
Kaguya’s Powers (The Chakra Monster)
None of this makes Kaguya any less of a near-incomprehensible powerhouse. After consuming the Chakra Fruit of the God Tree, she gained access to effectively infinite energy, the ability to manipulate entire dimensions at will, and the dreaded Ash Bone Spikes — a technique capable of fully disintegrating anything it touches.
Even more impressive: Kaguya is, for all practical purposes, immortal. The only way Team 7 found to actually neutralize her wasn’t killing her in direct combat — it was sealing her away with Six Paths: Chibaku Tensei, a dimensional prison, not a conventional defeat. That alone says a lot about just how close to “indestructible” she really is.
Isshiki’s “Anti-Kit” (Why His Powers Cancel Hers Out)
And this is exactly where the scale tips hard in Isshiki’s favor, because his powers seem almost purpose-built to neutralize everything that makes Kaguya so dangerous.
The first piece of that puzzle is Sukunahikona, the ability to instantly shrink any inanimate object or jutsu within his line of sight. In practice, that means Kaguya’s Ash Bone Spikes, or any of her large-scale jutsu, would simply get shrunk down and neutralized before they could do any damage at all — her most feared weapon turned harmless in an instant.
The second piece is even easier to picture: raw speed and taijutsu. Isshiki physically humiliated the adult versions of Naruto and Sasuke — shinobi drastically stronger than the teenage versions who, years earlier, needed significant outside help just to seal Kaguya away. Isshiki’s physical speed operates on a level so far above hers that her ability to react simply wouldn’t keep up with the pace of the fight.
Final Verdict: Who’s Actually Stronger in a Fair Fight?
Putting clan hierarchy, combat history, and each one’s full skill set together, the definitive answer is: Isshiki Otsutsuki is stronger. In a direct, one-on-one confrontation — no surprise attacks from behind — his physical level, his accumulated combat experience, and especially his shrinking ability would be too much for Kaguya to handle, even with chakra reserves far larger than his. Raw power in massive quantity doesn’t count for much when your opponent can simply shrink and disable every attack before it does any damage.
Conclusion
At the end of the day, this rivalry carries a real irony: even though Isshiki wins hands-down in a straight fight, it was Kaguya’s cold strategic thinking — her decision to strike from behind instead of risking a fair duel she knew she’d lose — that ended up changing the fate of planet Earth. She didn’t need to be stronger. She just needed to be smarter in one decisive moment, and that was enough to rewrite the entire story that followed.
So, do you agree with this result, or do you think Kaguya’s immortality would eventually wear Isshiki down in a longer fight?