There are fanfictions where Naruto and Madara's bodies are merged in a sense. Maybe through some magical or scientific experiment. This creates a new being with a mix of their abilities, memories, and personalities. This new entity would have to find its place in the Naruto world, which could lead to all sorts of interesting plot twists as it battles with its own identity while also dealing with the external threats in the story.
In some fanfictions, Naruto's body might be enhanced with Madara's physical strength. This could make him an even more formidable opponent. For example, he could have Madara's brute force combined with his own ninja skills.
Often, Madara's body is depicted as a vessel for different powers in fanfiction. It could be a host for some ancient and dark energy that Naruto has to face. Writers might also explore how Madara's body, which is full of Uchiha secrets, reacts when exposed to Naruto's unique Uzumaki chakra.
Well, in such a fanfiction, it might start with Naruto being in a situation where he becomes Madara's pet. Maybe at first, Naruto is defiant but as time passes, he could start to understand Madara's motives in some strange way. Madara, on the other hand, might initially see Naruto as just a possession but gradually develop a sense of attachment. It could be a really strange and complex relationship that unfolds as the story progresses.
Madara could also save Naruto by using his knowledge of the ninja world. Maybe he has some inside information about a plot against Naruto and he intervenes in time to stop it. He might have discovered a secret plan by an enemy group and takes action to keep Naruto out of harm's way. This could involve manipulating events behind the scenes or directly confronting the threat.
In this fanfiction, Naruto's character development could be seen as a counterpoint to Madara's. Naruto is all about hope, friendship, and protecting the village. Madara has been through a lot of pain and betrayal which led him to a path of destruction. If Naruto is like Madara in this fanfiction, his development might involve a struggle between his own beliefs and the allure of Madara - like power and ruthlessness. However, Naruto would probably still find a way to use any new - found power in a more benevolent way compared to Madara.
Some fanfictions might depict Naruto as having a deeper understanding of the chakra system than ever before. He could have found a way to disrupt Madara's connection to the chakra source, or maybe he was able to use his own chakra in a way that nullified Madara's powerful jutsus. Also, Naruto's experience from all his previous battles might have led him to anticipate Madara's moves and strategies, allowing him to stay one step ahead and ultimately defeat him.
Well, in some versions of fanfiction, Naruto might have unlocked a new and super - powerful form of his Sage Mode. This enhanced form could give him the strength and speed necessary to outmaneuver and overpower Madara. Maybe he also gets some unexpected help from allies, like a new jutsu from Kakashi that weakens Madara's defenses just long enough for Naruto to land the final blow.
In some Naruto fanfictions, Madara might be sealed through a powerful jutsu created by the main character. For example, the protagonist could combine different elemental chakra natures to form a unique sealing technique specifically designed to counter Madara's power.
Often, the resemblance could be in terms of the way Naruto stands or moves in these fanfictions. For example, Naruto might adopt a more menacing stance similar to Madara's. Also, his hair could be described in a way that it seems to mimic Madara's wild look, perhaps when he's in the middle of using a powerful jutsu.
Often, Naruto's loneliness in fanfiction is shown through his solitary moments. He might be sitting alone on the Hokage Rock, looking over the village that doesn't fully accept him. It's a visual way to represent his isolation.
Well, in such a fanfiction, Madara's training might enhance Naruto's physical strength. He could teach Naruto some advanced Uchiha techniques which Naruto can combine with his own Uzumaki powers. For example, Naruto might learn better chakra control from Madara, enabling him to use his Rasengan more effectively and with less chakra waste.
In a Naruto fanfiction where he has Madara's attitude, he could become more power - hungry. Madara was always seeking power to reshape the world according to his ideals. Naruto might start to view the tailed beasts not as friends but as tools for greater power. He could try to gather more chakra and perhaps even attempt to unlock new forms of power that are more in line with Madara's dark and ambitious nature, which would shock his comrades and enemies alike.