Power is a common theme. Both Madara and Sasuke are extremely powerful characters, so fanfics often explore how their powers interact or complement each other. Another theme is redemption. Madara has a complex past, and Sasuke has his own journey of redemption in the original story, so this can be explored in their relationship in fanfics.
One interesting Sasuke x Hinata Madara fanfic is 'The Unlikely Bond'. It explores a unique scenario where Sasuke, Hinata and Madara are brought together in a complex plot. The characters' personalities are well - written and the story has a good flow.
They would likely have a complex relationship. At first, they might be wary of Madara as he has been their enemy in the past. But as they train under him, they would start to respect his skills and knowledge. Naruto might try to understand Madara's motives and see if there's any good in him. Sasuke, having an Uchiha connection, might feel a stronger sense of kinship but still be cautious. Madara, for his part, would probably see them as tools at first but gradually develop a strange sort of respect for their growth.
One possible plot twist could be that Sakura discovers a hidden weakness of Madara's during the fight. Maybe it's a chakra point that, when struck, temporarily paralyzes him, giving her an upper hand.
The moment when Naruto first unleashes his new ultimate attack against Madara would be really exciting. Maybe it's a combination of his Rasengan and some kind of Sage power that creates a huge explosion of energy that Madara has to struggle to defend against.
Well, one possible plot could be that Naruto discovers a new jutsu specifically designed to counter Madara's powerful Sharingan abilities. This jutsu might be related to the Sage of Six Paths' power that he already has. With this new power, Naruto engages in a series of intense battles with Madara, each time getting closer to figuring out Madara's weaknesses.
In such a fanfiction, Naruto could potentially win by using his new Sage of Six Paths powers to their fullest. He might be able to overpower Madara's Rinnegan abilities. For example, Naruto could use his massive chakra reserves to create countless shadow clones and overwhelm Madara in a battle of attrition.
One key element is the exploration of new relationships. Since Sasuke, Hinata and Madara don't have a traditional relationship in the original work, fanfics get to create unique bonds between them. For example, they might be forced into an alliance in a fanfic and have to learn to trust each other.
One popular'madara x sasuke fanfic' is 'The Bond Beyond Time'. It delves into their complex relationship and how they might interact in different scenarios. Another good one could be 'Pathways of Power' which focuses on their growth together in a unique AU (Alternate Universe).
Well, one possible outcome could be that Naruto and Sasuke manage to defeat Madara through their combined strength and newfound powers. They might use their signature jutsus in a coordinated way that Madara can't counter.