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.
In this fanfiction, Naruto being Madara's older brother could mean that the Uchiha clan's relationship with the village would be much better. Naruto would have influenced Madara to work towards unity. And the whole story of the Naruto world, from the early conflicts to the later battles, would be rewritten with a more positive and united tone.
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 possibility is that Naruto would use Madara's powerful body to end conflicts in the ninja world more quickly. With Madara's physical strength and Naruto's spirit, he could overpower enemies easily.
The Hidden Leaf Village would surely launch a rescue mission. They would send their best ninjas, like Sasuke, Kakashi, etc. This could lead to intense battles between Madara's forces and the Leaf Village ninjas. It would be a great opportunity to show off different ninja techniques and strategies.
In such a fanfiction, Naruto might initially try to persuade Madara to give up his evil plans. He could use his talk - no - jutsu to appeal to Madara's better nature, if there is any left. Maybe they would have an epic battle first, with Naruto showing off his new Sage of Six Paths powers against Madara's Rinnegan abilities.
In this fanfiction, Naruto and Madara could engage in friendly battles to test each other's strength. These battles wouldn't be about hatred or revenge but rather about mutual growth. Naruto could learn new techniques from Madara, and Madara could be impressed by Naruto's ability to quickly adapt and improve. Their friendship could be based on respect for each other's power and determination.
Sure. There are likely some good ones. Look for those with high ratings and lots of reviews. In such fanfictions, the writer could create a whole new dynamic between Naruto and Madara. Maybe Naruto could have prevented Madara from going down his dark path, or they could have had a very different kind of power struggle compared to what we saw in the original series.
In fanfiction, if Naruto takes Madara's eyes, he might gain incredible new powers. For example, he could potentially combine the power of the Sharingan or the Rinnegan with his own Sage Mode. This could make him an even more formidable opponent, able to predict attacks more accurately and use powerful genjutsu.
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 possibility is that Naruto would gain a different perspective on the shinobi world. Madara has his own views which are often very different from the traditional ones. This could lead Naruto to question some of the things he has been taught and make him more open - minded in dealing with future conflicts, not just thinking in the way of Konoha but on a broader scale of the whole shinobi world.
If Naruto were to become like Madara in fanfiction, it would be a huge shift. Naruto has always been about hope and friendship. But like Madara, he could start to see the ninja world as something that needs to be reshaped by his own hands, regardless of the cost. He may abandon his village's values and try to impose his own version of order. This would lead to conflicts with his former allies. For example, Sasuke might be one of the first to oppose him as Sasuke has his own ideas about the ninja world and would not easily accept Naruto's new Madara - like ways.