If Naruto becomes the Demon of the Mist in fanfiction, he might start to lose his sense of self. The title 'Demon of the Mist' implies a certain level of malevolence and mystery that is quite different from Naruto's usual sunny disposition. His ninja way would be severely tested as he tries to balance the new, darker identity with his old values. Maybe he'd be forced to fight against his former allies who see him as a threat now. Also, his appearance could change to something more in line with the image of a demon, which would be a shock to those who know him well.
Well, Naruto becoming the Demon of the Mist in fanfiction would mean a total shift in his character arc. He'd be plunged into a world where the values and power structures of the Mist Village are different from Konoha's. His training would take a new direction, perhaps learning more about the dark arts or unique Mist - style jutsu. He could potentially become a loner, as the stigma of being the 'Demon' would push people away. However, he might also find a new sense of purpose in trying to reform the Mist Village from within, using his new identity to break the cycle of fear and hatred that often surrounds the concept of the 'Demon' there.
The Hidden Mist Village would see a transformation. Naruto's presence as Mizukage would mean that the village would become more open to outsiders. His reputation for never giving up would inspire the Mist ninjas. In terms of the village's structure, he might reform the way the ninja squads are formed. He'd also encourage the development of new jutsu by promoting a more collaborative environment. And with his influence, the Hidden Mist could become a more prosperous and peaceful village.
If Naruto becomes a Mist Ninja in fanfiction, it would have a huge impact on the ninja world's politics. Konoha might see him as a traitor, or they could try to negotiate with the Hidden Mist for his return. The Hidden Mist, on the other hand, would gain a powerful ally in Naruto. This could change the balance of power between the villages. Naruto himself would be in a unique position to bridge the gap between the two villages, using his newfound knowledge of the Mist Ninja and his roots in Konoha to promote peace and understanding.
If Naruto becomes a demon in a fanfic, it could lead to a whole new set of adventures. He might be shunned by the village he once protected. However, this could also be an opportunity for him to discover a new side of his power. He could use his demonic powers for good, but first he would need to overcome the prejudice against him. His relationships with characters like Sasuke and Sakura would be put to the test as they might not trust him immediately.
If Tanjiro becomes a demon in fanfiction, he might lose his sense of humanity. His relationships with his friends and family would be severely strained. For example, his sister Nezuko, who is also a demon, might be affected in unexpected ways. He could struggle with his newfound bloodlust and the need to consume humans, which goes against his original kind - hearted nature.
Well, if Naruto becomes the Kyuubi in the fanfiction, he would likely have an overwhelming amount of power. He might be able to defeat his enemies with ease. But he would also face the struggle of controlling such a powerful and wild force inside him. Maybe his friends would be both in awe and a bit scared of him at first.
Well, if Naruto becomes a homunculus in fanfiction, he might gain some unique alchemical powers. He could have enhanced physical abilities like super strength and speed, similar to what homunculi typically possess in the original concept. His ninja skills would probably merge with these new powers in interesting ways.
Well, in such a fanfiction, Naruto would likely lose all his skills and knowledge as a ninja. He'd be completely dependent on others for care, like eating baby food and being diaper - changed. Maybe his friends would have to protect him from the enemies who might see this as an opportunity to get rid of him once and for all.
Well, if Naruto becomes the reaper in fanfiction, he would probably have a whole new set of powers. He could start reaping souls in the Naruto universe, which would be a huge change. Maybe he'd use his new reaper abilities to deal with the more dangerous enemies in a different way, like sending their souls to some sort of afterlife realm.
If Naruto becomes an Arrancar in a fanfiction, he would likely gain new and powerful abilities. Arrancars have unique Hollow powers, so Naruto might be able to use Cero or other Hollow - based attacks. His physical abilities could also be enhanced, and his appearance would change to something more like an Arrancar. He might struggle with the more evil tendencies that come with being an Arrancar at first, but being Naruto, he would probably find a way to use these new powers for good and protect his friends and the village in a different way.
Well, if Naruto becomes Mikoto, he would be a female in the body of Mikoto. He could bring his own values and experiences as Naruto. This could potentially change the relationship dynamics within the Uchiha clan. He may try to bridge the gap between the Uchiha and the rest of the village in a way that Mikoto might not have been able to do in the original story due to her own limitations and the circumstances of the time.