The fanfiction could explore Naruto being in a situation where he has to act like Madara to deceive the enemy. He gradually gets too deep into the role and starts to actually think and act like Madara on a more permanent basis. His friends notice the changes in his personality, like his increased aggression and his new - found belief in power as the ultimate factor in achieving goals. They then try to bring the old Naruto back.
One possible plot could be that Naruto starts adopting Deadpool's fourth - wall - breaking style. He might make jokes about his own story, like how he's always chasing Sasuke and how it's like an endless loop. For example, he could look at the reader and say something like 'You think I'll catch him this time? Maybe, maybe not!'.
One possible plot could be that Naruto, after being exposed to some strange chakra or magic, starts to take on Grimmjow's aggressive and fearless attitude. He might become more impulsive in battle, like Grimmjow, and start to challenge his enemies without much thought for strategy at first. His friends would be confused by this sudden change in his behavior.
Well, one possible plot could be that Naruto starts to adopt Pain's view on justice. He might see the world as a place full of suffering that needs a radical change. He could begin to question the traditional ways of the Hidden Leaf Village and try to implement some of Pain's ideas in a more positive way, like finding a new system to ensure peace that doesn't rely solely on the power of the ninja villages.
A really interesting plot twist could be that Naruto's Dante - like behavior is actually a result of a genjutsu cast by a hidden enemy. As he acts more and more like Dante, his friends start to suspect something is wrong and have to figure out how to break the genjutsu without harming Naruto.
Well, it could be about Naruto adopting Kisuke's laid - back yet intelligent attitude. Maybe he starts dressing in a more Kisuke - like style, with a long coat and a hat. He could also start using some of Kisuke's signature moves or strategies in battles, like using gadgets or outsmarting his opponents in a very Kisuke - esque way.
In the 'naruto acts like a cat fanfiction', a plot could be that Naruto befriends a group of stray cats in the village. They teach him their ways, and he in turn, protects them from the meaner villagers. As he acts more like a cat, he starts to understand their language, sort of like a telepathic connection. This connection helps him gather intelligence from all the places the cats can go, which he then uses in his ninja duties. This would be an interesting way to show Naruto's kind heart and his ability to adapt to new situations.
One possible plot could be that Naruto, for some reason, decides to adopt Sasori's more calculating and detached approach to combat. He might start using puppets or puppet - like techniques in battles, much like Sasori did. Maybe he's on a mission where he has to infiltrate an enemy base and he thinks acting like Sasori would be the best way to succeed.
The other Konoha ninjas would be quite shocked. The Hokage, whoever it is at that time, would see Naruto's change as a potential threat to the village's stability. They would likely keep a close eye on him and try to figure out what caused this transformation. Meanwhile, the younger generation of ninjas who looked up to Naruto would be confused and disappointed. They expected Naruto to be their role model of a kind - hearted and positive ninja, not someone acting like the feared Madara.
In a 'Madara Adopts Naruto' fanfiction, perhaps Madara adopts Naruto because he sees a kindred spirit in him. Madara might want to mold Naruto into a powerful force to reshape the ninja world according to his own ideals. Naruto, on the other hand, could either resist or be influenced by Madara's views, leading to an internal struggle within Naruto as he tries to balance his own values with what Madara is teaching him.
One possible plot could be that Naruto discovers his true heritage as Madara's grandson gradually. This revelation shakes his world as he has to come to terms with being related to a once - feared enemy.