If Naruto wishes for the return of the dead, it would be a huge shift. Characters like Itachi could then use his wisdom to guide the new generation. Also, the balance of power among the villages would be different as some of the most powerful shinobi would be back. It would also have a great impact on the emotional state of the living characters who lost their loved ones.
If he wishes for peace, the entire political structure of the ninja world would change. There would be no need for the hidden villages to constantly be on guard against each other. This could lead to a more unified ninja world where resources are shared, and everyone can progress together.
If he wishes for a better childhood for all, it would mean that the root causes of many villains' motives would disappear. For example, Pain's backstory was rooted in the loss and suffering he faced as a child. With this wish, there would be less chance of new villains emerging, and the overall atmosphere in the Naruto universe would become more positive and nurturing.
Well, Naruto getting a Keyblade would be a wild turn. Firstly, the Keyblade has a certain magic to it. Naruto's world is mainly about chakra, but with a Keyblade, he could introduce a new form of energy. He might be able to combine chakra with the power of the Keyblade. In terms of his friends, they would be both amazed and a bit envious. Sasuke, for instance, would see it as another way Naruto is getting stronger. And Naruto would have to learn how to wield it properly. He might start training with it in the same way he did with his rasengan, trying to master all its functions and forms.
The doujutsu from kami might also grant Naruto new offensive capabilities. It could potentially allow him to use some sort of energy projection or manipulation that is unique to this doujutsu. For example, he could fire beams of spiritual energy that can disrupt an opponent's chakra system.
The power dynamics could shift. In fanfiction, new powers could be introduced to Naruto, making him even more powerful. This would change how he is perceived in the Naruto universe and how he interacts with other characters like Sasuke and Sakura.
The power balance would be greatly affected. If fanfiction gives Naruto some overpowered abilities like instant teleportation across any distance, it would make many of his battles much easier. Enemies that were once a threat would no longer be so.
He might wish for the end of all hatred in the ninja world. This would mean no more wars and grudges among the villages. Everyone could focus on building a better future together.
Well, if Naruto were to obtain a bloodline from Kami in a fanfic, it would be a huge game - changer. His physical and mental capabilities could skyrocket. He could have new jutsu that are on a whole different level, perhaps being able to heal at an accelerated rate or even have some sort of spiritual connection that allows him to foresee events. It would also likely cause a stir among the other ninja, who would either be in awe or fear of his newfound powers.
His relationship with the older generations like Kakashi and Tsunade could shift. They would see Naruto as a more mature and capable ninja. Naruto could use the insights from his doujutsu to contribute more to the decision - making in the village, and they would respect his opinions more.
It could be a doujutsu that allows him to see the future in fragments. So he can get glimpses of his opponents' next moves or potential threats in the near future.
The power dynamics would shift significantly. Naruto already being very powerful, with the connection to Kaguya, he might be seen as an even greater threat or asset. Allies and enemies would likely reevaluate their relationships with him.
If Naruto was Kenpachi - inspired in a fanfiction, the ninja world would see a more aggressive Naruto. He'd be quicker to engage in combat, which could either intimidate his enemies or make some of the more diplomatic ninja a bit wary. His new attitude might also inspire some of the younger ninja to be more bold in their training and battles.