The plot could involve Naruto getting the sword as a gift from an unexpected source. With Kisame's sword in his possession, Naruto becomes a target for many who either want the sword for themselves or fear the power it could give Naruto. Naruto then has to protect the sword while also trying to master it. He might seek out old sword - masters in the ninja world to train him. Along the way, he could face off against enemies who are also after the sword, and his friends might be in danger because of it.
Well, in some fanfictions, Naruto might defeat Kisame in a battle and take the sword as a trophy. Maybe he uses his newfound Sage Mode powers or some other advanced jutsu to overpower Kisame and claim the sword.
It would make Naruto more versatile. He's always been known for his straightforward and energetic fighting style with his ninjutsu. Having a sword like Kisame's would add a more serious and perhaps a bit of a dark edge to his character. He would have to be more calculated in his attacks, as a sword requires different combat tactics compared to his usual jutsus.
However, it might also attract unwanted attention. Other villains or even some of the shinobi villages could see Naruto with Kisame's sword and assume he has some sort of alliance with Kisame or the Akatsuki. This could lead to him being targeted or distrusted by others.
In a fanfic of Kisame and Itachi taking Naruto, it might explore the relationship between the two Akatsuki members and Naruto. Itachi has his own complex reasons for his actions, and Kisame is his loyal partner. When they take Naruto, Itachi might be conflicted as he has a connection to Naruto through Sasuke. They could end up in a situation where they have to make a choice about what to do with Naruto.
In some fanfics, Itachi and Kisame might save Naruto because they realize his potential importance to the overall balance in the ninja world. Itachi, having his own hidden motives and a sense of protecting the village from afar, could see Naruto as a key figure. Kisame, following Itachi's lead, would also be involved. They might save Naruto from a group of rogue ninjas who are after Naruto's power. This would create an interesting dynamic as Naruto would be both suspicious and grateful towards them.
One popular fanfic could be 'The Encounter' where Itachi and Kisame are on a mission to find Naruto. In this fanfic, they face various challenges while tracking him down. It shows their unique abilities as they navigate through different terrains in the Naruto world. They might encounter other characters along the way who either help or hinder their search.
Naruto's character might become more calculating. Kisame is a very strategic fighter, and Naruto could pick up on this trait. He would start to think more before acting in battles.
Kisame's sword could be a plot device by having it hold the essence of an ancient ninja art. Naruto, in his journey to become stronger, discovers that the sword can teach him this art. He has to first overcome the dark nature of the sword, which was influenced by Kisame. So, he battles with the sword's influence while trying to learn the art, creating a complex and engaging plot.
One possible plot for a 'naruto trained by kisame fanfic' is that Naruto is sent on a secret mission where he has to infiltrate an enemy base that is heavily guarded with water - based defenses. In order to succeed, he seeks out Kisame, who is an expert in water - style and stealth. Kisame trains Naruto not only in water - style jutsu but also in how to move silently in water, how to sense enemies through water vibrations, and how to use water as a cover. This training would enhance Naruto's skills and make him a more versatile shinobi, able to handle different types of combat situations.