There could be. Fanfiction writers like to explore different 'what - if' scenarios. Since Naruto and Kushina have a strong connection in the original series, some writers might be intrigued by the idea of reversing their relationship in a fictional context. But it goes against the established lore of the main Naruto storyline.
If Naruto was the older brother of Kushina, it would rewrite a lot of the backstory. For one, Naruto might be the one to introduce Kushina to Minato. He could see Minato's potential and think he would be a good match for his sister. Also, Naruto's skills and abilities could have a different origin. Maybe he learned some things from Kushina or their family that were unique. This would change his fight scenes and how he approaches challenges in the fanfiction. He might also have a different relationship with the Uzumaki clan as a whole, having more of a family - based influence within it.
In such a fanfiction, Naruto could have a big influence on Kushina's life. For example, he might train her earlier, sharing his ninja knowledge with her. Their relationship could also affect how Kushina views the Uzumaki clan and her place in it. Since Naruto is known for his determination, he could inspire Kushina to be stronger and more confident in this alternate scenario. This would likely lead to a different chain of events in the story, perhaps changing the way the whole Uzumaki clan is perceived in the Naruto world.
Well, if Naruto were Kushina's older brother, the whole story of Naruto would be turned on its head. The story would start with Naruto already having a family connection to the Uzumaki clan. His training and development would likely be different as he would have grown up with Kushina. He might have learned some unique Uzumaki techniques from their family. His relationship with the other characters would also change. For instance, his relationship with Jiraiya might be different as Jiraiya might also see Naruto in a different light due to his relation to Kushina. And when it comes to the big events in the Naruto universe, Naruto would be in a position to directly influence Kushina's actions, which could change the course of many events.
The older brother in the fanfiction might be a character with a tragic past. For example, he could have been experimented on by Orochimaru and gained some strange powers as a result. And he returns to the village later to protect Naruto from the threats that are coming towards him.
Well, it could be about a lot of things. Maybe it's a story where Naruto is Kushina's brother in an alternate universe. It could explore their relationship, like how they support each other, or it might involve their shared experiences growing up in the Hidden Leaf Village. It might also touch on how Naruto's presence as Kushina's brother affects the main Naruto storyline we know, such as his interactions with characters like Minato, who was Kushina's husband.
Yes, there are likely some fanfictions out there with this premise. Fanfiction often takes creative liberties with the original Naruto story. Writers might explore how this relationship would change the story's dynamics, character interactions, and plotlines. It could lead to very different character development for Naruto and how he is related to other characters in the Naruto universe.
Obviously, Naruto and Kushina would be the main characters since it's about Naruto being Kushina's brother. But there could also be other important characters. Minato might be a significant character as he was Kushina's husband. Also, characters like Jiraiya could be involved, as he was Naruto's teacher and had a connection to Minato. And then there are Naruto's friends like Sasuke and Sakura, who could interact with Naruto in this new family - centered scenario.
In the fanfiction, the older brother could change Naruto's view of his family and his place in the world. Naruto would have a connection to his past that he didn't know before. This could lead him to explore more about the Uzumaki clan and discover hidden powers or knowledge. And it could also affect his relationships with Sasuke and Sakura. For instance, his brother could help him understand Sasuke's pain better, leading to a different dynamic between them.
Well, in this fanfiction idea, Naruto being Sona's older brother could bring a whole new dynamic. Maybe Naruto's protective nature would extend to Sona. He could teach her some of his ninja skills and values like never giving up. It could also create interesting interactions with the other characters in their respective universes. For example, how would the devils in Sona's world react to Naruto's presence? And how would Naruto handle the political aspects of Sona's world which are quite different from his own ninja village politics.