Well, in a fanfiction world, it could be possible through some creative storytelling. Maybe there's some kind of multiverse concept where the Naruto universe and the world of Cinder somehow collide. The author might create a backstory where their parents are connected in a very unexpected way. For example, perhaps a powerful wizard or entity has the ability to cross different fictional realms and unites their families for some grand, overarching plot purpose.
It could be a case of magic or some super - natural force at work. In fanfiction, rules are often bent. Maybe there was a time - travel element involved. A character from Naruto's world travels to Cinder's world in the past and somehow becomes part of her family line, thus making Naruto her brother. Or it could be that both Naruto and Cinder are descendants of some ancient, powerful race that exists across different fictional settings, which is only revealed in this fanfiction.
Well, in fanfiction, anything can be possible. It could be that in this fictional universe, there are some magical or cross - dimensional events that led to Naruto and Pyrrha being related as siblings. Maybe there's a powerful being that decided to create this strange connection for some greater purpose in the story, like uniting two different fictional worlds in a unique way.
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.
One way this could work in fanfiction is if there was a crossover of universes. Some kind of rift or magical event could have brought their two worlds together. And perhaps they were born from the same source in a new, combined reality. Their relationships with their friends in their respective shows could also be affected. For instance, Sasuke and Kagome might have to deal with this new family dynamic as well.
She could gain new powers or abilities. In the Naruto universe, there are many different forms of power. Maybe she could learn some basic ninjutsu or even develop a new form of her Maiden powers by combining it with chakra. This would not only change her combat capabilities but also her character as she becomes more powerful and has to handle this newfound strength in a different way compared to RWBY.
In fanfiction, the idea of Naruto being Itachi's half - brother might be based on some creative reinterpretation of the clans. Suppose there was a long - lost connection between the Uzumaki and the Uchiha clans. This could potentially lead to a situation where Naruto and Itachi share a half - brother relationship. However, it's important to note that this goes against the canon story. The beauty of fanfiction is that it allows for these kinds of 'what - if' scenarios.
In a fanfiction, anything can be possible. Maybe the author creates a crossover universe where the Naruto and Dragon Ball universes collide. It could be due to some magical or scientific experiment that links Naruto and Trunks as brothers. However, this is completely against the original storylines of both Naruto and Dragon Ball, but that's the fun of fanfiction - to explore wild and creative ideas.
It could be a comical take in the fanfic as well. Maybe a crazy inventor or a bumbling wizard accidentally casts a spell that merges the two worlds in a strange way, making Sephiroth Naruto's brother. This would lead to hilarious situations like Sephiroth trying to understand Naruto's love for ramen or Naruto being baffled by Sephiroth's long, flowing hair and his rather dark and brooding personality.
In fanfiction, the idea of Naruto being Esdeath's brother might be achieved through some creative world - building. Maybe there could be a crossover of their respective universes where some powerful force or magic links their fates. For example, a powerful sorcerer could have meddled with time and space, causing their families to be connected in some strange way.
In fanfiction, the idea of Naruto being Mirajane's brother might be achieved through some creative plot devices. For example, it could be a result of some time - traveling or dimension - hopping event. A wizard or a ninja with special abilities accidentally merges their two worlds in a way that Naruto and Mirajane end up being related as siblings. This allows the writer to explore how characters from two very different series would interact within a family dynamic.
The dynamic could be complex. Naruto's ninja skills and his ability to make friends and form alliances could greatly benefit Cinder in her own world. He could teach her about loyalty and perseverance. Cinder, with her own set of skills and knowledge, might also introduce Naruto to new concepts in her world. There could be some clashes too, as Naruto's values of friendship and hard work might conflict with Cinder's more self - serving tendencies at times. But overall, their relationship would probably be one of growth and mutual influence as they learn from each other.