This list is about the top 10 strongest ninja ever lived. As the Otsutsuki members are not in this list. With that being said, let’s get started.

Madara Uchiha:
At Number 1 spot, we have Madara Uchiha, the founder of the Uchiha clan. Though the base form of Madara is highly skilled and only comparable against Hashirama, the God of shinobi, but when he became the 10 tails Jinchuriki, he literally became unstoppable.
And thanks to Hashirama cells and sage mode and rinnegans.
Naruto Uzumaki:
Naruto befriended with the 9tails and entered in Kurama Sage Mode. And after he got power from the Sage of the Six Paths himself, he became incredibly strong. Even all the other Tailed Beasts had one of their portion of chakra inside him. So, Naruto could anytime use one of their or all of their chakra simultaneously.

Sasuke Uchiha
Sasuke was the re-incarnation of Indra Otsutsuki. He gained power through training with Orochimaru. Later he defeated his elder brother, Itachi Uchiha and took his eyes afterwards. After that, the sage of the six path gave him 3 tomoe Rinnegan. He could fly with his complete full body Susanoo, he could switch place with things in limited place.
Obito Uchiha
Obito was one of the strongest character in the entire Naruto series. Once he got 10 tail jinchuriki he literally gained godlike power. Even, all the 4 hokage, Naruto, Sasuke altogether couldn’t do much against him. Except one time with the Sage Mode Rasengan. So, yes he was damn powerful back then.
So, there might be an argument, if Sasuke and Naruto are stronger than Obito or not. But, i think after they got power from the Sage of The Six Paths, they became a lot lot stronger from before.
Kakashi Hatake
Kakashi with 2 eye sharingan, might be on the top of the list. It really depends on how you see things. He literally cut down all the hands of the rabbit goddess, the momment he got 2 of the Obito’s Sharingan. He immediately awoke the Full body Complete Susanoo. Then he used the Kamui Shuriken and Kamui Raikiri right of the bat. If he didn’t do that Team 7 would never be able to defeat Kaguya.

Hashirama Senju
The God of Shinobi. Hashirama was the one who fought against Madara and full 9 tails with ease and capture the 9 tails like nothing. Even after getting the eternal Mangekyou Sharingan, Madara could do no real harm against Hashirama.
That man summoned a giant True Thousand hand statue. And on top of that he stood on a wooden golem and wooden dragon which alone can swoop Madara’s Susanoo covered 9 tails.

Minato Namikaze
The fastest ninja in Naruto. He all by himself brought the 3rd shinobi war to an end and gained the nickname yellow flash. Enemy troops got the direct order to flee immediately the moment they could see him.
Soon after the 3rd Great Ninja war ended, he was named as the 4th Hokage.
Might Guy
Might guy had no talent whatsoever when he got admitted into the ninja academy. But with sheer willpower and hard work he became one of the strongest naruto characters. He was declared as the strongest Taijutsu user by Madara Uchiha himself.
Hiruzen Sarutobi
Hiruzen Sarutobi or the 3rd Hokage was also known as the God of Shinobi. He was also known as the professor. Thanks to his profound wisdom and knowledge in ninjutsu, taijutsu and genjutsu, he learned each and every jutsu available.
Jiraiya
Jiraiya was the student of the 3rd Hokage and the teacher of 4th Hokage and 7th Hokage. After becoming the tode sage he became incredibly strong. He fought against all 6 of the pain all by himself and nearly succeeded. He killed half of the pains body. He could flee using reverse summoning jutsu. But instead he remained there to find out the real identity of Pain.