Before the Night of the Clan Massacre, I Lead the Entire Uchiha Clan to the World of One Piece

He keeps bragging about Kai. If Kai didn't open the eighth gate, he would at least be a jounin. Wouldn't it be enough to kill him instantly before he could open the eighth gate? It's best to fight if you know the basics

The most important thing for a family is the purity of its bloodline.

Uchiha Shisui's ability is Tsukuyomi, are you kidding me? Uchiha Shisui's ability is beyond that of a god!

I remember that Madarakai Susana can chop down a mountain with one sword, but I don't remember that One Piece can do that. ( I haven't watched One Piece in more than 2 years, so I'm not sure)

It was impossible for Tsunade to appear during that time period. Her family, younger brother, and lover were all plotted to death by the Third Generation. In addition, she was suffering from hemophobia. Did she still have any fighting power?

Any tailed beast jade from the Nine Tails can destroy the island. It is huge, has strong recovery and defense. Kyuubi's performance is not strong only because Uchiha and the first generation restrained Kyuubi. .

I saw various opinions in the comment area, and I would like to express my own opinion. Sharingan opens the skill of kaleidoscope learning, which is the ability that appears based on inner thoughts. Mangekyo Sharingan is also called the eye of spiritual reflection. So what you said about Shisui's eyes is that of another god. It is the ability in Naruto, and it is an ability that appears based on his inner thoughts. Then if a time-travelling pirate's inner thoughts change, his abilities will also change accordingly, and it is possible for him to have various abilities. As for the comparison of the combat power between Naruto and Pirates, it's hard to say too harshly, because Naruto has many abilities, and just one Water Release can restrain most of the fruit-powered users among Pirates. So is genjutsu spiritual energy or chakra energy? I think it is spiritual energy, because genjutsu attacks a person's spirit. For example, if you are hit by genjutsu, you will fall into a coma. Chakra is just a kind of energy, no different from other energies.

Why do you have to fight against pirates? The protagonist can definitely win over many people by sneaking back to Hokage. Orochimaru's research ability is of great help.

Three Mangekyō Sharingan can equal one Emperor of the Emperor. Fuyuki doesn't know what the effect will be, but Shisui's other gods alone can kill one of the Four Emperors in seconds.

First of all, it is basically no problem for the Six Paths to surpass the Four Emperors. Ranking of the powerful Naruto: Kaguya, Six Paths Narasa, Six Paths Madara, Six Paths Obito, Sennin Hashirama, Six Paths Pain, Tobirama and Minato, etc. These all have the ability to single out the Four Emperors. The Five Shadows are no worse than the Four Emperors in terms of ability, especially if they are reincarnated in the dirt, what are you going to do to the pirates and thugs? Infinite stamina, infinite chakra, even if it kills you, it can pull you into its own camp. This is unsolvable, because the pirates do not have the ability to seal. And below the Kage level, ninjas fight intelligence warfare, but what about pirates? Reckless. Once an esper's ability is revealed, he has no advantage over a ninja other than physical advantages. There is also ninjutsu, yinjutsu, which uses spiritual energy to create material images from nothing. The water of Water Release is created by chakra and cannot restrain espers. However, in the sea environment, Water Release can still control the sea water and restrain espers. There should be no objection to this.