One interesting aspect in this fanfiction could be the reaction of other characters. Sasuke might be a bit jealous that Naruto has this new and powerful ability. The village elders might be worried about how Naruto will use it. Naruto himself could use Kamui to explore new areas, like finding hidden places in the ninja world that were previously inaccessible. He could also use it to spy on the enemy's movements without being detected, which would give Konoha a great advantage in any potential conflicts.
In the 'Naruto gets Kamui' fanfiction, Naruto might face some challenges in controlling Kamui at first. Since it's a different type of power from what he's used to. He could accidentally teleport himself to strange locations. But as he gets better at it, he could combine his existing jutsu with Kamui. For example, he could use Rasengan while teleporting towards an enemy, making it a really powerful and unexpected attack.
Well, Naruto could gain the ability to use Kamui and use it for various things. Maybe he'd use it to surprise his enemies in battle, suddenly disappearing and reappearing in unexpected places. He could also use it to rescue comrades who are in dangerous situations that are hard to reach normally.
In a 'naruto gets captured' fanfiction, he might be tortured for information. His captors could be after the secrets of his Nine - Tails chakra. They may try to use him as a bargaining chip against Konoha.
One possibility is that Naruto discovers a new level of relaxation he didn't know before. He's always on the go as a ninja, so the massage might open his eyes to the importance of taking a break.
Imagine if the tanto was a gift from a mysterious stranger. This stranger could be an ally or an enemy in disguise. Naruto would be suspicious but also intrigued. As he tries to figure out the stranger's motives, he also has to deal with the tanto's unique abilities. Maybe the tanto can transform into different shapes, and Naruto has to learn how to control this transformation in the heat of battle.
He would probably face a lot of challenges at first. Since he's been neglected, he might not have the proper training to handle the Zanpakuto right away. But as he learns, he could start to gain respect from those who once neglected him. His new power would change the way people view him in the Naruto universe.
In this fanfiction, Naruto might have an interesting adventure with the Twi'lek. Maybe the Twi'lek has some unique abilities that can help Naruto in his quests. For example, the Twi'lek could be very good at stealth and help Naruto infiltrate an enemy base. Or perhaps the Twi'lek has knowledge of a rare form of jutsu that Naruto has never heard of and can teach him, expanding his skills as a ninja.
Well, Naruto might use the Keyblade to gain power and respect. He could start training with it and show those who neglected him what he's capable of.
Well, perhaps the new arm comes from some kind of ancient and mysterious source. It could be an arm that was once part of a powerful ninja from the past. This new arm could have a mind of its own, at first causing Naruto some trouble as he tries to control it, but eventually they work in harmony and it gives Naruto an edge in battles against tough enemies.
In this fanfiction, Naruto might gain some unique jutsu skills from Itachi. Itachi is extremely powerful, so he could teach Naruto advanced genjutsu or ways to better control his chakra. For example, Naruto might learn how to quickly break free from strong genjutsu attacks, which would be a great advantage in battles against tough opponents.
He might slow down the progress of the mission. His teammates would have to take extra care of him. They could either find a safe place to let him rest and recover or struggle to complete the mission while protecting the sick Naruto.
Well, Naruto might use the lightsaber in a very unique way. He could combine his chakra control with the power of the lightsaber. For example, he could infuse his chakra into the lightsaber to make it stronger or to give it new abilities. Maybe he would create some kind of new jutsu that involves the lightsaber. Since Naruto is known for his creative fighting styles, having a lightsaber would just add another dimension to his combat skills.