A 'naruto vs jigen fanfic' could be really interesting. Naruto is known for his never - give - up attitude. He would likely start the fight with his usual bravado and confidence. Jigen, being a more mysterious and powerful opponent, would probably initially have the upper hand. But Naruto's ability to adapt in battle is remarkable. He could analyze Jigen's fighting style during the fight and come up with new strategies. The fanfic could also introduce new elements like a power - up for Naruto or a hidden ability of Jigen that changes the course of the battle.
One possible plot twist could be that Naruto discovers a way to nullify Jigen's power. Maybe he finds a weakness in the power source that Jigen draws from. Another twist could be that Jigen is actually being controlled by a greater evil, and Naruto has to figure out a way to free him rather than just defeat him. It could also be that Naruto loses his powers temporarily during the fight and has to rely on his wits and the help of his friends in unexpected ways.
Sasuke is often a popular character in these fanfictions. He might play a role in helping Naruto against Madara or have his own motives during their battle. Kakashi can also be a prominent figure, perhaps using his Sharingan in a crucial moment to assist Naruto. Another popular character could be Hashirama, as his connection to Madara is a key part of the original story and can be further explored in fanfiction.
Another theme is redemption. Sometimes in these fanfics, Madara has a chance at redemption through his fight with Naruto. Naruto's belief in people's goodness can influence the outcome in such scenarios.
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.
One interesting plotline could be Naruto discovers a new form that gives him an edge over Madara. For example, a form that allows him to nullify Madara's Sharingan abilities. Another could be Madara having a change of heart due to Naruto's unwavering belief in him. Maybe he starts to question his own motives for destruction.
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.