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Kaguya Ōtsutsuki Although she had almost lost by Naruto's pervy jutsu but she was still the most powerful in Naruto. And why would she not be as she was the one to wield chakra in the world.
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'Uzumaki Naruto da' Naruto drew power from emotions and turned them into hard work which made him powerful. He had an upperhand due to Kurama but after him being gone, we can see that Naruto is strong with or without him.
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Sasuke Uchiha Then comes Sasuke who was the most dear to Orochimaru. We have seen Sasuke in many battles and his anger and mind always made him stand from everyone, having his own aura of a rogue ninja.
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Hagoromo Ōtsutsuki The Sage of Six Paths exhibits incredible strength even after passing away, crucially helping Naruto and Sasuke fight Kaguya and bringing Team 7 back from Kaguya's dimension.
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Hashirama Senju Half of villains in the show was almot nothing without Hashirama Senju's cell, which pretty much gives us the idea of how powerful the first Hokage was.
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Madara Uchiha People worshipped Madara Uchiha. Even his haters, who do not exist in this world, appreciates his strength, intellect and courage who denied to fight Hashirama Senju's clone.
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Obito Uchiha He walked on the path Madara chose for him which was criminal. He controlled Akatsuki and almost taken Kurama along. Such are the events make us recognise his power.
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