It changes the storyline a great deal. Firstly, Naruto's age and his place in the timeline of the Hidden Leaf Village would be different. Since he is now an ancestor figure, he would have lived in a much earlier era. This could lead to different historical events in the village being tied to him. Also, his role as a hero might not be the same. In the original, he was a hero for his generation, but as Kushina's grandfather, he could be a founder - like figure for the Uzumaki - Namikaze family line, and his heroic deeds could be more about establishing the family and the village in the first place.
Well, it would completely turn the story upside down. The family relationships are so crucial in Naruto. If Naruto were Kushina's grandfather, it would mean a whole new set of character dynamics. For example, Minato's relationship with Naruto would be extremely different. Instead of being his father, he would be some distant relative. And Naruto's connection to the Uzumaki clan would be much more complex and ancient. It could also change how Naruto obtains his powers. Maybe he would inherit some ancient Uzumaki abilities in a different way than in the original story.
Well, in such a fanfiction, the Naruto world would be a chaotic mess. Naruto as Kushina's father would mean the timeline of events related to the Uzumaki clan and Konoha would be all jumbled up. His relationship with Sasuke would also be affected. They were rivals because of their different family situations and goals. But with this new family setup, Naruto's motives and Sasuke's perception of him would be very different. And Naruto's status in the village might be completely different too, as his relation to Kushina would give him a different kind of standing in the Uzumaki - related matters in Konoha.
This fanfiction could also change the relationships with other characters. For example, if Kushina hates Minato, the Third Hokage might have to step in more often to mediate between them. And the other villagers might also take sides, creating a divided village atmosphere that is quite different from the united one in the original story.
If Kushina were alive in Naruto fanfiction, it could change the story in many ways. For one, Naruto would grow up with a mother figure. He might not have faced so much loneliness and discrimination in the village as Kushina could have protected him. Also, Kushina was a powerful kunoichi. She could have trained Naruto herself, perhaps passing on unique Uzumaki techniques earlier. This could have made Naruto even stronger, more quickly.
Well, if Naruto was trained by Kushina in fanfiction, it could make him a lot more in - touch with his Uzumaki heritage from the start. He might learn unique Uzumaki jutsus earlier, like some powerful sealing techniques. Also, Kushina's feisty personality could be passed on more directly, making Naruto even more determined and head - strong in a different way than in the original story.
In such a fanfiction scenario, the village of Konoha would be affected too. Minato is a respected figure. His abandonment could cause a scandal. Naruto might not have the same level of protection from the village elders. This could lead to different power dynamics within the village. Maybe other ninja clans would try to take advantage of Naruto's situation. Also, Kushina's family might react in various ways, some might try to find Minato and some might focus on taking care of Kushina and Naruto.
Well, it completely flips the original story. For starters, all the relationships get turned upside down. Naruto, being the father, would mean he was the one who made all the big decisions before Minato was born. It also changes the whole dynamic of how Minato would view Naruto. Instead of being a son looking up to his father, it would be a son trying to understand his father who is younger than him in the normal timeline. And Naruto's friends would now be his son's predecessors. It's a really wild concept that changes the Naruto universe we know in a big way.
If Naruto has the power of Sans Fanfiction, it might introduce some unique interactions. For instance, Sans' power of dodging attacks effortlessly could be combined with Naruto's own combat skills. This could lead to some really interesting fight scenes where Naruto seems almost unhittable. Also, it could affect how he approaches his enemies, as he now has a different set of powers to rely on.
The fanfiction would also change the relationship dynamics in the story. For instance, Naruto's relationship with his father Minato would be more complex as he might also feel some resentment towards Minato for not preventing Kushina from leaving. It could also affect how Naruto views family in general, making him more cynical or desperate for family love.
Naruto would likely be more confident earlier. With his mother around, he'd have someone who unconditionally loves and supports him from the start. He wouldn't have to seek as much approval from others. His growth might also be more focused on learning Uzumaki techniques rather than just trying to prove himself. He could be more stable emotionally as Kushina could help him deal with his inner turmoil, like the Nine - Tails situation.
It could also lead to different character developments. Naruto might become more independent and self - reliant at a faster rate. Without Kushina's presence, he has to figure things out on his own, which could make him grow up quicker in terms of his ninja skills and decision - making abilities. Also, it could potentially create a rift in the Uzumaki clan's dynamics if Naruto's absence has an impact on how the clan is perceived or functions within the Hidden Leaf Village.