Yes, there are likely some fanfictions out there with such a premise. Fanfiction writers often come up with creative and out - of - the - box ideas like this. However, it's not part of the official Naruto storyline.
Well, if Naruto were Madara's brother in a fanfiction, it would completely change the Naruto universe. Their power levels combined could make them an unbeatable force. Naruto's positive attitude might have influenced Madara to not go down the dark path he did in the original story. It could also lead to different alliances and battles, with Naruto perhaps trying to reason with Madara and change his view of the ninja world.
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.
One common theme is loyalty. Their loyalty to each other as brothers is often explored, whether it's tested by the events in the ninja world or by their own personal goals. For example, in many fanfics, they have to choose between their loyalty to the clan and their loyalty to each other.
I'm not sure about a specific 'Naruto brother of Madara fanfiction' title off the top of my head. But you can try searching on fanfiction websites like FanFiction.net or Archive of Our Own. Just type in the keywords 'Naruto brother of Madara' and you'll likely find a bunch of stories that explore this interesting concept. Some might focus on how Naruto's values could influence Madara if they were brothers, or vice versa, which can make for some really engaging reading.
In a 'Naruto brother of Madara fanfiction', a plotline might involve Naruto using his connection to Madara to bridge the gap between the Uchiha clan and the rest of the village. Since he has a different upbringing compared to Madara, he could bring a fresh perspective to the Uchiha's grievances. Another interesting plotline could be that Naruto discovers he has some latent Uchiha abilities due to his relation to Madara. This could lead to him training in new ways and developing powers that are a blend of his Uzumaki and Uchiha heritage. There could also be a plot where Madara's past actions are re - evaluated in light of his relation to Naruto. Maybe there were reasons behind his actions that Naruto uncovers, which could lead to a redemption arc for Madara.
There's 'Madara and His Brother: A Forgotten Tale'. This fanfic focuses on the early days of their family. It shows how they supported each other in the face of clan expectations and how their relationship was affected by the events around them. It's really interesting to see how the author portrays their brotherly love.
The plot could revolve around his early life. Maybe he was always in Madara's shadow, and the fanfiction could explore how he tried to find his own identity. He could start training secretly to develop unique skills that set him apart from Madara.
One great fanfiction could be where Madara's brother plays a crucial role in preventing the Uchiha massacre. He might secretly work with Itachi to expose the real plotters in the village, thus saving the Uchiha clan. This kind of story gives a new perspective on the Uchiha's situation and shows how things could have been different if he had been more involved.
Well, Naruto's positive attitude would likely have a huge impact on Madara. He might be able to stop Madara from becoming so bitter. Madara might end up being more like Naruto, believing in the goodness of people.