No. Naruto and Laxus are from two completely different anime universes, Naruto and Fairy Tail respectively. While fanfiction can play around with all sorts of wild ideas, making Naruto Laxus' older brother is not a mainstream or even a common fanfiction concept. It would require a lot of creative world - building to make such a relationship seem plausible. For example, the writer would have to explain how Naruto, with his ninja skills and chakra system, could exist in the world of magic like Fairy Tail and have a family - like connection with Laxus. But as of now, this is not a typical fanfiction scenario.
The plot could start with Naruto's arrival in the Fairy Tail world. As Laxus' older brother, he would immediately take on a protective role. He could use his rasengan and other jutsu to fight off enemies that threaten Laxus or the guild. Naruto might also try to bridge the gap between the two different power systems - chakra and magic. Along the way, there could be a lot of character development for both Naruto and Laxus. Laxus could learn about Naruto's past and the struggles he had in his own world, which would inspire him to be a better mage. And Naruto would adapt to the Fairy Tail world, using his skills to help the guild grow and protect it from internal and external threats.
There could be. Fanfiction writers have a lot of creativity. They might see some similarities between Naruto and Laxus in terms of their strong personalities and leadership qualities, and thus come up with the idea of making them brothers in a fan - made story. It's all about exploring new narrative possibilities.
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.
In this fanfiction plot, Naruto could be brought to the Fairy Tail world as a young child. Laxus, being his older brother, takes it upon himself to protect Naruto. As Naruto grows, he discovers his own unique brand of magic that is influenced by his ninja abilities. They get involved in a big conflict where the guild is split into different factions. Naruto and Laxus have to use their combined strength and their unbreakable brotherly bond to reunite the guild and defeat the external threats that are taking advantage of the guild's internal strife. This could be a story full of action, emotion, and the exploration of two very different yet similar characters.
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.
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.
In some fanfictions, it's possible for Naruto to be depicted as Anko's older brother. Fanfiction often takes creative liberties with established characters and their relationships.
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.
One idea could be that Naruto, with his strong sense of justice and loyalty, helps Rias in the supernatural politics of her world. He might use his ninja skills to protect her and her peerage from other devils or threats. For example, when facing a powerful rival devil clan, Naruto's shadow clone jutsu could create a diversion while Rias plans a strategic attack.
In a fanfiction where Naruto is Madara's older brother, it could completely change the Naruto universe's dynamics. For example, Naruto's ideals of peace and friendship might have influenced Madara at a young age, preventing him from going down the dark path he did in the original story. Naruto could have taught Madara about the power of bonds, which was something Madara seemed to have lost sight of later in his life. This would lead to a different series of events, perhaps even averting the many wars that took place in the Naruto world.