It could be a new group of rogue ninjas who have a vendetta against Konoha. They might be led by a powerful and cunning ninja who has a personal grudge against Naruto or the village in general.
In many fanfictions about Naruto fighting Sasuke during the Chunin Exams, it often showcases their intense rivalry. One common aspect is the display of new jutsus that they might have developed secretly. For example, Naruto could have a new form of the Rasengan, and Sasuke might have evolved his Chidori in some unique way. This makes the fight more exciting as it goes beyond what we saw in the original series.
The plot could start with Naruto somehow being transported to Middle - earth. He quickly realizes the evil that Sauron represents. Naruto, being the hero he is, decides to take on Sauron. Along the way, he might team up with some of the local heroes in Middle - earth, like Aragorn or Legolas. They would be initially skeptical of Naruto but soon realize his power. Naruto would then engage in a series of battles with Sauron's minions, leading up to the final showdown with Sauron himself.
In a fanfic where Naruto fights Sauron, Naruto would likely win. Naruto has incredible speed, strength, and the ability to use chakra for various powerful jutsus. He can also summon giant toads to help him in battle. Sauron, while a powerful dark lord in Middle - earth, is more of a traditional, slow - moving evil entity. Naruto's agility and combat skills would give him the upper hand.
In this fanfiction scenario, Naruto would bring his own unique fighting style. He's got his shadow clones and Rasengan. Sasori is a tough opponent with his puppet army. Naruto might struggle at first to deal with the puppets' various attacks. But with his determination and quick thinking, he could find a way to get close to Sasori and use his Rasengan. It would be an intense battle, different from the one Sakura had with Sasori, as Naruto has a completely different set of skills and strategies.
Naruto could potentially use a new form of the Nine - Tails Chakra Mode. Maybe he combines it with his Sage Mode in a more seamless way than ever before. This would give him enhanced strength, speed, and the ability to sense danger more acutely.
Perhaps in the fanfiction, Naruto discovers a hidden secret about his family that gives him an edge in his fight back. For example, he might find out that his family had a special connection to a powerful force or technique, and he uses this knowledge to gain strength and take on his foes. This could involve him having to train hard to unlock this potential within himself.
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.
In a fanfiction where Naruto fights his parents, it could be a really emotional and complex situation. Maybe it's a result of some sort of mind - control or misunderstanding. Naruto, being a strong - willed character, would likely hold back at first, not wanting to harm them. His parents, on the other hand, might be acting out of some forced obligation or false belief. It could lead to a battle that ultimately ends with Naruto finding a way to break whatever spell or falsehood is causing the rift, and they'd have a tearful reunion.
Well, it's really hard to say. Naruto is from a world of ninjas with chakra and all sorts of unique abilities. His ability to summon toads and use shadow clones gives him an edge in numbers and strategic options. Whitebeard has his quake - quake fruit which can cause massive destruction. However, Naruto's nine - tailed fox form would be a game - changer. It gives him incredible strength and speed. In a fanfiction, the writer could make it go either way depending on how they want to play with the powers and the plot, but if I had to choose, Naruto's versatility might just tip the scales in his favor.