An immortal being is a being that cannot be killed by any normal means. Naturally, they are one of the worst enemies to fight because they cannot be dealt with as easily as others. There are several characters in Naruto who have achieved immortality in one way or another. These individuals survived situations such as being mutilated or beaten. In battle, these characters are nearly impossible to beat, but there are certain Naruto warriors who pull it off.

Naruto: 6 villains stronger than Akatsuki
Akatsuki was strong, but he was far from the Naruto franchise's strongest villain.
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Shikamaru Nara
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The smartest person in Konoha
Shikamaru is not a strong man, but he makes up for his lack of physical strength with his high intelligence. After Hidan kills Asuma, Shikamaru vows revenge. Because he was aware of Hidan's immortality, he planned to use the mercenary's own powers as a weapon against him. Shikamaru separated Hidan from Kakuzu and led him into a trap filled with several explosive tags. Upon activation, Hidan's body was dismembered and buried alive.
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Uzumaki Naruto
Naruto has fought many powerful enemies, but none have come close to Kaguya, the rabbit goddess. She actually gave him a run for his money. Naruto used almost every trick in the book to stop Kaguya, but none of them proved effective. Fortunately, Naruto was able to seal Kaguya after some hard work, although he needed help from Team 7 and Obito Uchiha. After sealing her away, Naruto and his friends effectively saved the world from disaster.

Naruto: 7 Ninjas Who Surpassed Hashirama Senju, Rankings
Hashirama Senju was a powerful Kage, but there were quite a few shinobi that surpassed him in Naruto.
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sasuke uchiha
The battle with Kaguya was the ultimate test of Sasuke's strength. At first, Sasuke did not want to participate in the Fourth Ninja War, but after Itachi gave him some sense, he returned to his friends. Sasuke was a force to be reckoned with even before the war began, but after receiving the power of the Six Paths Saint, his strength improved dramatically. Despite his increased power, Sasuke needed Naruto's help to seal Kaguya away forever.
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Otsutsuki Hagoromo
Hagoromo Ōtsutsuki is also known as the Six Paths Saint. As Kaguya's eldest son, he was born with exceptionally strong chakra. He also possessed the Rinnegan, one of the most powerful swords in the series. He decided to put all his skills to the test in rebellion against his mother. Hagoromo teamed up with his younger brother Hamura and fought alongside Kaguya for several months. In the end, they succeeded in taking down their mother.

Naruto: 8 Incredibly Strong Characters
You shouldn't judge certain Naruto characters by their appearance. Here are some unexpected examples that turned out to be surprisingly strong:
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Hamura Otsutsuki
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ancestor of the Hyuga clan
Hamura is Hagoromo's younger brother and the one who helped his younger brother seal their mother. Even if his achievements are not as great as Hagoromo's, it would be foolish to underestimate Hamura. After all, he possessed powerful chakra, as well as the Tenseigan, which is an evolved form of the Byakugan. With these abilities, he can take down most Naruto characters.
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Kakashi Hatake
Kakashi is one of the most beloved characters in the series who has remained relevant throughout the story. Kakashi is a skilled combatant who can quickly recognize his enemy's abilities. But his genius alone wasn't enough to defeat Kaguya. Fortunately, Obito shared his last remaining chakra with Kakashi, which gave Kakashi great strength. This helped Kakashi overpower Kaguya and created the most important opportunity for Naruto and Sasuke to take down Kaguya.
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Itachi Uchiha
Itachi is a tragic figure who sacrificed everything for his village and his brother. He joined Akatsuki and watched over his younger brother at the same time. While in Akatsuki, he met Orochimaru, who had a strong desire to claim the Uchiha body for himself. However, Itachi easily defeated the legendary member of the Sannin.
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black zetz
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Otsutsuki Kaguya Manifestation of Will
Black Zetsu was considered an unimportant character. But the audience couldn't have been more wrong. In fact, he was the brains behind the biggest events that would change the ninja world forever. Although he lacked the power to defeat an opponent like Madara in a head-to-head fight, he waited in the shadows for the right moment to strike.