He'd change the combat dynamics. His ninja abilities would give the humans an edge. Simple as that.
Naruto's presence would have a huge impact. First, his positive attitude would lift the spirits of the people in the Attack on Titan world. Second, his combat skills would allow for more aggressive attacks on the Titans. For example, his ability to quickly move around and dodge attacks would be very useful. Also, his ninjutsu could be used to destroy Titans from a distance. And he might even try to find a way to communicate with the Titans, just like he tries to understand his enemies in the Naruto world.
Naruto falling into the Attack on Titan fanfiction would completely transform the story. His unique powers and his way of thinking are very different from the characters in Attack on Titan. He could potentially use his Sage Mode to gain more knowledge about the Titans and their origin. His relationship - building skills might also help to unite the different factions in the Attack on Titan world. He might start training the younger generation to become stronger, just like he was trained in the Hidden Leaf Village. And his never - give - up attitude could lead to new hope for the people constantly living in fear of the Titans.
It could change the story by introducing new skills. For example, if she knows martial arts from the modern world, she could use it against Titans in a different way than the characters in the original story.
Fem Naruto's superhuman strength, which comes from her chakra - enhanced body, would allow her to take on Titans in close - combat more effectively than the average Attack on Titan character. She could probably leap onto Titans and deliver powerful blows without the need for the ODM gear's blades. Her healing ability, if it exists in the fanfiction, would also be a huge advantage. If a character gets injured during a Titan attack, she could heal them, increasing the survival rate of the soldiers. This would not only change the outcome of individual battles but also the overall morale and strategy of the fight against Titans.
The world of Attack on Titan would experience a major transformation with the introduction of Pokemon. Socially, the relationship between people would change as they bond over their Pokemon. There could be Pokemon centers and Pokemarts within the walls. Economically, a new industry would emerge around Pokemon. In terms of combat, as I mentioned before, different types of Pokemon would bring new tactics. Fire - type Pokemon could set the Titans on fire, ice - type Pokemon could freeze them, and so on. Also, the idea of Pokemon evolution could be incorporated into the story. Maybe the more a trainer and their Pokemon fight Titans together, the stronger their bond and the more evolved their Pokemon becomes, making them even more effective against the Titans.
Her presence could make Naruto more protective. He's already lost so much in his life, and having a sister would give him someone else to care for deeply. This might make him even more determined to become strong and protect the village, as he now has his sister to think about.
Naruto could change the story by providing new ways to fight Titans. His ninjutsu skills would give the humans an edge. For example, his ability to move quickly and stealthily like a ninja could be used to gather information about the Titans more effectively.
Well, he could use his ninja skills to fight the Titans in a really cool way. Maybe he'd show the Survey Corps some new combat techniques. For example, his Shadow Clone Jutsu could be used to confuse the Titans while the soldiers attack from different directions.
Naruto's powers would need to be adjusted to fit the AoT setting. His chakra - based attacks could be seen as a new form of energy in that world. His ability to run on walls like a ninja could be similar to the ODM gear users, but with his own unique style. Maybe his summoning jutsu could bring in some helpful creatures to fight the Titans.
In the fanfiction context, Naruto in modern Konoha would be a huge influence. His unique ninja abilities would be a source of fascination for the villagers. He might inspire the younger generation to take up the ninja way more seriously. Also, his own story of rising from an outcast to a hero could give hope to those who are struggling in the modern Konoha. He could also change the village's defense strategies by introducing some of his own battle - tested techniques.
Culturally, Naruto's presence would have a huge impact. He would introduce ninja culture to the samurai. This could include things like ninja tools, jutsu, and the ninja way of life. At the same time, he would learn about the samurai code and their traditions. This cultural exchange could be a central theme in the fanfiction, with Naruto becoming a bridge between the two cultures.
He would change the power balance. His raw strength and speed could intimidate some opponents. And his strategic thinking would make him a tough opponent to plan against.