Well, first of all, the Akatsuki's plans might change. Since Naruto was a key target for them, with him dead, they might look for other sources of power. The relationship between the Hidden Villages would also be affected. Konoha would be mourning and in a state of instability, which could make other villages either try to take advantage or offer support in unexpected ways. His parents, on the other hand, would probably become outcasts in the village, shunned by most for what they did.
The village would be in chaos. Naruto was seen as the hope for the future, so his death would leave a huge void. His friends like Sasuke and Sakura would be devastated. They might turn against Naruto's parents, leading to more conflict in the village. Also, the balance of power in the ninja world could shift as Konoha would be weakened without Naruto.
It would turn the Naruto universe upside down. The story has always been about the growth of characters, their dreams, and their fight against evil. If Naruto starts a cult, it would shift the focus to something much darker. The social fabric of the villages would be torn apart as some people would be drawn into the cult while others would fight against it. The idea of friendship and camaraderie that is so central to the series would be replaced by the isolation and secrecy often associated with cults. It would be a radical departure from the Naruto we know and love, and would likely cause a great deal of outrage among fans who cherish the original themes and values of the series.
It would change it drastically. Naruto is known for his loyalty and friendship. If he were to kill his friends, it would shatter the image of the hero. His friends like Sasuke, Sakura, and Shikamaru are important to the overall story and relationships in the Naruto universe. Their deaths at Naruto's hands would create a huge rift among the other characters.
The story would be very different. Naruto's parents being alive would mean he has a support system from the start. His father could pass on his jutsu and wisdom more directly. Naruto might not have the same drive to become Hokage in the same way, as he wouldn't be seeking that family - like recognition from the village. His mother's presence would also add an element of warmth and stability to his life. And perhaps he would be more of a prodigy with both his parents' guidance, changing the power dynamics in the ninja world.
The impact would be huge. For one, all of Naruto's friends like Sasuke and Sakura would be devastated. Their whole world view which was centered around Naruto's positive influence would be shattered. Also, the village of Konoha would lose its greatest hope for the future. Naruto was seen as the one to bring about change and peace, so without him, the village might descend into chaos or be more vulnerable to outside threats.
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.
If Naruto gains a Zanpakuto, it would completely change the power dynamics in the Naruto universe. Naruto is already extremely powerful with his chakra and Sage Mode, etc. A Zanpakuto would add a whole new dimension to his combat abilities. He might be able to use its unique powers in combination with his shadow clones, for example, sending clones out with the Zanpakuto's special abilities to surprise opponents. It could also potentially give him new ways to deal with different types of jutsu and enemies.
If Naruto had Quincy powers, his combat style would be drastically different. Quincy powers in 'Bleach' are mainly about manipulating spiritual energy in a very precise way. Naruto, who is used to his chakra-based techniques like Rasengan, would now have the ability to fire spiritual arrows or create constructs out of spiritual energy. This could potentially make him even more powerful in battles against the likes of Sasuke or the Akatsuki. His Sage Mode could also interact in interesting ways with the Quincy powers, perhaps enhancing the range and precision of his spiritual attacks.
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.
Well, for starters, Naruto being a Sith Lord would mean a huge shift in the power balance. His chakra abilities combined with Sith powers would make him an extremely formidable foe. The Hidden Leaf Village would no longer be the same. It might turn into a place ruled by fear rather than the harmony it once had. His training would be different too, focusing more on dark side techniques rather than the traditional ninja training. And his appearance might even change to reflect his new dark status, perhaps with darker clothing and a more menacing look.
In a 'naruto with sharingan fanfic', Naruto's new power could also change the way battles are fought. With the Sharingan, he can predict his opponents' moves more accurately. This might make some of his previous opponents, who were evenly matched with him before, seem much weaker. It could also force his enemies to come up with new strategies to counter his enhanced abilities, which in turn would change the overall military and strategic landscape of the Naruto universe.