In this fanfiction, Naruto could gain the powers of a God of Destruction through a special encounter. Maybe he meets an ancient being who sees his potential. His training to control these powers would be intense. He would have to learn to balance his old ninja values with the new role of maintaining balance in the universe through destruction when necessary.
Naruto becoming a demon god would be a game - changer. His power level would skyrocket. He could start by using it to protect Konoha from any threats, both internal and external. In terms of his enemies, they would be no match for him. But he would also face challenges from within himself. The nature of demon god power might try to corrupt his good - hearted nature. He would have to rely on his willpower and the values his friends and mentors have instilled in him to stay true to himself while using this immense power.
One possible plot could be that Naruto is exposed to a powerful and dark jutsu that slowly turns him into a demon. As he transforms, he has to struggle with his new nature. His friends initially fear him but then try to find a way to reverse the process.
It's also likely that Naruto becomes a god dragon slayer as a result of a prophecy. The fanfiction could explore how he initially struggles with this new role. He has to deal with the expectations that come with being a 'god' - level dragon slayer. Along the way, he might make new allies, like other dragon slayers or magical creatures who recognize his potential and help him in his journey to master this new power.
I think Hinata would also be an ally. She has always been in love with Naruto and would support him no matter what. And the rest of the Konoha 11 would probably be his allies too. They have all fought together and have a sense of camaraderie. With Naruto as a god - like figure, they could help him spread his message of peace and use his powers to protect the village and the world at large. They would be the ones who understand Naruto the best and would be there to assist him in any way they can.
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, in such a fanfiction scenario where Naruto becomes the Death God, it would change the entire power dynamic. Naruto, being the Death God, could potentially end wars instantly. He might be able to manipulate the souls of the dead, which could lead to some really interesting plotlines. For example, he could communicate with the souls of past Hokages more directly and gain their wisdom in a whole new way.
Well, he would probably have superhuman strength and speed. As a vampire god, Naruto could use his new powers to protect Konoha in ways he couldn't before. He might be able to move so fast that enemies can't even see him coming. His ninjutsu could also be enhanced with his vampiric abilities, like adding some dark elements to his Rasengan.
Well, he might gain extraordinary powers. Maybe he can control all the elements in a much more powerful way than before. For example, his fire jutsu could be so strong that it can burn through any defense easily.