It could be Madara himself. He is extremely powerful and arrogant. He might make a crucial move that he thinks will end the battle quickly but actually gives Naruto and Sasuke an opening. For example, he could overextend himself while using a powerful jutsu, and Naruto and Sasuke could take advantage of his momentary vulnerability.
Sasuke could also be the one. With his Sharingan and Rinnegan, he has unique abilities. He might use his Amaterasu in a very unexpected way, like creating a large - scale trap for Madara using the black flames. His intelligence and cold - blooded nature in battle make him capable of making a decisive move.
Naruto. His incredible chakra and never - give - up attitude make him a force to be reckoned with. He could be the one to deal the final blow.
Naruto. His positive attitude and never - give - up spirit often inspire Sasuke. Also, his ability to connect with people gives them an advantage. He can rally support from unexpected places and his chakra is always a big boost in tough battles.
It's hard to say. Naruto has his powerful Nine - Tails Chakra and Sage Mode. But the five kages are also very strong. However, Naruto has a habit of coming out on top in tough situations, so he might be the likely winner.
In this kind of fanfiction, Naruto being 'godlike' gives him a huge advantage. He might have powers far beyond his normal capabilities. So, Naruto would likely win. He could use his super - enhanced Sage Mode, or maybe some new jutsu that he has acquired in this 'godlike' state to overpower Madara.
Naruto would probably win. He has an indomitable will and has always found ways to overcome powerful foes. His experience and the unique powers he might gain with the Rinnegan could give him an edge over Madara.
It's hard to say. If Naruto and Sakura work really well together, they could win. But Sasuke is extremely powerful too.
It's really hard to say. At the academy level, Naruto has his raw determination and his unique ability to learn quickly. However, Sasuke has his natural talent and the early signs of his Sharingan powers. If it's a physical fight, Sasuke might have an edge because of his agility. But if it's a test of willpower, Naruto could come out on top.
Obviously, Naruto and Sasuke are going to be the main characters. Their relationship and how it develops after their fight is likely to be the central focus of the fanfic.
It really depends on how the author writes it. If the black Naruto is written as being more powerful with no moral constraints, he might seem like the likely winner at first. But Naruto has the power of friendship and his strong will, so he could also come out on top.
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.