How could Naruto and Vegeta's relationship develop in a fanfiction where Naruto is the older brother?

Well, their relationship might develop in many ways. Naruto's kind - hearted and determined nature could influence Rias. He might protect her from various threats in the supernatural world of the fanfiction. For example, if Rias gets into trouble with other devil clans, Naruto, with his powerful ninja skills, would step in to defend her. Also, Naruto could teach Rias about the value of hard work and perseverance, which are traits he has in abundance from his own journey in the Naruto series.

Well, in such a fanfiction, their relationship might start off rocky. Naruto, being the protective older brother, could be constantly worried about Lucy getting into trouble. As time passes, they could grow closer through shared experiences, like Naruto teaching Lucy some ninja skills and Lucy showing Naruto the magic of her world. Eventually, they might become an unbeatable duo, relying on each other's strengths.

Their relationship could be a major driving force in the plot. Naruto could act as a mentor to Hashirama, guiding him in his decisions regarding the village. This would likely result in a much more developed and perhaps more just village from the start.

Their relationship could also have a bit of a fun side. Naruto might play pranks on Serena sometimes, but in a harmless way. And Serena would get back at him in her own cute ways. They would have deep conversations too, where Naruto shares his wisdom from his ninja experiences and Serena shares her thoughts about the world around them.

Well, it could start with Naruto being protective of Koneko. Maybe he discovers her unique abilities and decides to train with her, which gradually deepens their bond as siblings.

The development of their relationship in the 'naruto is raven's brother fanfiction' could be quite complex. Naruto, being the more extroverted one, might constantly try to draw Raven out of his shell. They could start with small exchanges, like Naruto sharing his love for ramen with Raven. As time passes, they might find themselves having each other's backs in battles. Raven could teach Naruto some of his more stealth - based skills, while Naruto could show Raven the power of friendship and determination. This mutual exchange and shared experiences would slowly build a strong brotherly bond between them.

Well, in this fanfiction, their relationship might start off rocky. Naruto, being his boisterous self, could initially baffle Shippo. But as they get to know each other's pasts, especially Naruto's lonely childhood and Shippo's own struggles, they start to bond. They might train together, with Naruto teaching Shippo some of his ninja moves, and Shippo in turn sharing his fox - related tricks. Eventually, they become inseparable, always having each other's backs in battles and in life in general.

Well, it could be a wild plot where Naruto, being Vegeta's brother, might introduce Saiyan powers into the Naruto universe. Maybe Naruto has to deal with the expectations of being a Saiyan while still maintaining his ninja ways.

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 fanfiction, the idea of Harry being Naruto's older brother might be possible if we consider that both characters have some similarities in their personalities. They are both determined and face great challenges. So, a writer could create a backstory where there is some sort of connection between their two worlds that makes them family. For example, perhaps a wizard from the Harry Potter world visited the Naruto world long ago and had a relationship that led to Harry and Naruto being related.