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.
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 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.
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.
There could be a backstory where Madara and Tobirama had a secret agreement that led to Naruto's existence. Maybe they foresaw a future threat and planned for Naruto to be born with their combined power to save the ninja world. Naruto would then have to uncover this mystery and fulfill his destiny.
In the fanfiction, when Naruto finds Madara's hideout, he could encounter some traps. However, Naruto's quick thinking and his skills would help him get through. There might be some clues about Madara's allies or his connection to other villains. Naruto could use this information to warn the Hidden Leaf Village. Also, he might find something related to the origin of Madara's power, which could be crucial in defeating him.
Fanfiction often plays with the concept of Naruto and Madara's bodies in different ways. For example, there could be a story where Madara's body is resurrected but with Naruto's spirit or chakra influencing it. This would create a unique blend of their personalities and abilities, and it might change the entire Naruto universe as we know it. It could also be a way to explore redemption arcs or new alliances in the fan - created storylines.