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!'.
The plot could involve Naruto getting some kind of strange power or curse that makes him act like Deadpool. He then starts to question the very nature of his world, just as Deadpool does. He might go on adventures that are completely different from his normal ninja missions. He could visit different dimensions in the Naruto universe and make fun of the different rules and cultures there. His friends would be really confused at first, but eventually get used to his new, wacky behavior.
Well, Naruto acting like Deadpool in a fanfiction with Fem Kyuubi could lead to some really chaotic and humorous situations. He might break the fourth wall and make jokes about the whole Naruto - Deadpool crossover concept. For example, he could say something like 'Hey, Kyuubi -chan, don't you think it's weird I'm acting like this guy with two swords on his back?'. And his unpredictable behavior would surely surprise the other characters in the Naruto universe.
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, 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.
Well, perhaps in the fanfic, Naruto is a big fan of Deadpool's comics in his own ninja world. One day, a mysterious jutsu goes wrong and he starts seeing Deadpool - like hallucinations. These hallucinations actually start teaching him new combat techniques and a different way of looking at life. As he follows these 'visions', he becomes more like Deadpool in his approach to battles and challenges in the ninja world.
It could be about Deadpool being transported to the Naruto universe and causing chaos. Maybe he tries to join a ninja team and messes up their missions in his own hilarious way.