Their combined abilities would likely make them the most powerful entity in the ninja world. For example, Naruto's ability to sense negative emotions and Madara's combat experience could lead to a new form of justice. They could easily defeat any rogue ninja or group that threatens the peace.
If they fuse, their combined chakra would be off the charts. Naruto's Nine - Tails chakra along with Madara's Uchiha power could revolutionize ninjutsu. They might be able to teach new techniques to the younger generation, which would change the way battles are fought. Also, their influence could bring the different ninja clans closer together as they see the potential in unity.
The fused Naruto - Madara would have a unique set of skills. With Naruto's Rasengan and Madara's Susanoo, they could create new and even more powerful attacks. This would force other ninja to up their game. Politically, they could use their power to end the long - standing rivalries between villages. Their combined presence would be a symbol of strength and unity, inspiring a new era of peace and cooperation in the ninja world.
Naruto would probably get Madara's Sharingan abilities. This could give him enhanced perception and the ability to copy jutsu more easily, like a supercharged version of his own ability. He might also gain access to Madara's Susanoo, which would be a huge boost to his combat capabilities.
The combination of Naruto and Madara's abilities would bring about a significant shift in the power balance of the world they time travel to. Naruto's positive influence and ability to inspire others, combined with Madara's strategic mind and combat skills, could lead to a new era of peace and cooperation. Their combined ninjutsu could also revolutionize the way ninjas in that time train and fight. For instance, Naruto's Rasengan combined with Madara's fire - based jutsu could create a whole new type of attack that others would try to emulate.
For Naruto, being trained by Madara could mean he learns how to counter Uchiha - specific techniques more effectively. His physical strength might also increase due to the intense training. Sasuke would be able to better harness his hatred and turn it into a more focused power source. Madara's teachings could expose them to ancient jutsu and knowledge that would give them an edge over their enemies. Their teamwork might also be affected, as they would both be influenced by Madara's way of thinking.
In such a fanfiction, Naruto's powerful chakra could be combined with Madara's Uchiha abilities in really interesting ways. Naruto might gain new Sharingan - like powers or be able to use some of Madara's signature jutsu more effectively. And their combined strength would probably make them nearly unbeatable in battle, changing the power dynamics in the Naruto universe completely.
The power balance would be greatly affected. If fanfiction gives Naruto some overpowered abilities like instant teleportation across any distance, it would make many of his battles much easier. Enemies that were once a threat would no longer be so.
If Naruto and Madara become friends, it could completely change the power balance. Their combined strength would be a deterrent to any potential invaders. On a more positive note, it could inspire a new generation of ninjas to look beyond past grudges. The younger ninjas would see that even the most bitter enemies can become friends. This could lead to a more unified ninja world where different clans and villages work together more closely. For example, the Uchiha clan might regain more trust within the Leaf village, and other villages might be more open to sharing resources and knowledge.
In some stories, like 'A New Dawn', Madara uses his knowledge of future jutsus to teach the younger generation earlier. This gives the ninja world an edge in battles and changes the power dynamics. For example, he might teach some advanced fire - style jutsus to the Uchiha clan members much earlier than in the original timeline.
In the fanfiction scenario where Madara gives Naruto his eyes, Naruto's abilities would transform. Firstly, the basic Sharingan abilities would improve his reaction time and perception. He could analyze his opponents' moves better. With the potential for the Mangekyo Sharingan, he could gain unique and powerful techniques. For example, if he got a fire - based Mangekyo ability, he could combine it with his own Rasengan or other wind - based jutsus to create new and more powerful attacks. This would not only make him stronger in battle but also give him new ways to protect his friends and the village.
His combat abilities would become more diverse. Madara could teach him new forms of taijutsu and ninjutsu. For example, Naruto might learn some of Madara's signature space - time ninjutsu, which would give him an edge in battles. His chakra control would also improve as Madara is very proficient in chakra manipulation.
The story would change drastically. Naruto's identity as a descendant of Madara would immediately put him at odds with some in the village who still fear the Uchiha. His journey to become Hokage would be even more challenging as he has to prove that he's not going to follow in Madara's footsteps. Also, his training might take a different route. He could be taught some ancient Uchiha techniques by an unexpected mentor, perhaps an old Uchiha who has been in hiding.