There could be unforeseen side effects on Naruto himself. Using this power might drain his energy or have some negative impact on his mental state. For example, he could start to see visions of the dead or be haunted by their memories, which could slowly erode his sanity and make it difficult for him to distinguish between the living and the dead.
He might face moral dilemmas. Controlling the dead means using the bodies or spirits of those who have passed away without their consent. Naruto, who is usually a morally upright character, would have to struggle with whether this power is right to use or not. This could also cause internal conflict within himself and strain his relationships with his friends who might not approve of such actions.
One consequence could be that it disturbs the balance of the ninja world. The dead are supposed to rest, and by controlling them, Naruto might be messing with the natural order. This could lead to other ninja clans or villages seeing him as a threat.
One consequence could be that it makes him an outcast. Controlling the dead is often seen as a dark and forbidden art, so his friends and allies might be afraid of him or turn against him.
One consequence could be moral. They would have to deal with the ethics of controlling the dead. Are they disturbing the natural order? This could cause a rift between them and some of their friends and allies who might not agree with such a practice.
In some fanfics, it could be due to a forbidden jutsu he discovers. Maybe he stumbles upon an ancient scroll that details the process of controlling the dead.
In some fanfiction concepts, it could be due to a new, powerful jutsu he discovers or perhaps as a result of some ancient curse or blessing that is bestowed upon him.
One possible consequence could be a change in Naruto's power level. If Hinata can control the seal, she might be able to regulate the flow of power from it, which could either enhance or limit Naruto's abilities.
In some fanfiction concepts, Naruto and Sakura might control the dead through powerful jutsu. Maybe they discover an ancient forbidden technique. For example, they could find a scroll that teaches them how to manipulate the souls of the dead. This could be a result of their continuous exploration and growth in the ninja world.
It varies from one fanfiction to another. Some fanfictions might depict Naruto as dead to introduce a new set of challenges for the remaining characters. For example, if Naruto dies, Konoha might be left vulnerable, and characters like Sasuke or Sakura would have to step up in different ways. But there are also plenty of fanfictions where Naruto remains alive and continues his journey, perhaps facing new and even more dangerous threats than in the original series.
It could be a rogue ninja from another village who has a vendetta against Naruto. This ninja might have set a very elaborate trap that made it seem like Naruto was killed and left his body in a place where his friends would find him and think he was dead.
Well, in a 'naruto is brain dead fanfic', it could be that the author wanted to create a very unique and tragic storyline. It could explore how his friends react, like Sasuke might feel a great sense of loss or guilt. Also, it could change the whole dynamic of the Hidden Leaf Village. The story might focus on the attempts to either revive him or deal with the aftermath of his condition.
Well, 'dead garden naruto fanfic' could potentially be a fanfiction where the 'dead garden' is a central theme. It could be a place full of mystery in the Naruto world. Maybe it has some sort of dark magic or secrets related to the characters in Naruto. For example, it could be a place where powerful jutsus are hidden or a place that has a connection to a character's past traumas. It really depends on the creativity of the fanfic writer.