Obviously Naruto would still be one of the main characters. He played a huge part in the Fourth War and his influence would still be felt strongly in the post - war world. Sasuke would also be a main character as he was a key figure in the war as well. And Sakura, who has grown into a strong kunoichi, would also be important in the story.
In 'naruto after 4th war fanfic', a really cool plot development could be the integration of the tailed beasts into normal society. Since the war is over, the tailed beasts are no longer seen as just weapons. They might start to live among the humans, and some ninja could even form bonds with them outside of being jinchuriki. This would completely change the power dynamics and social structure of the ninja world. Also, there could be a plot where Naruto uses his new - found influence after the war to create a more unified ninja world, where villages share resources and knowledge more freely.
In such a fanfiction, Naruto might feel extremely betrayed. He's just saved the village in the Fourth War, and being banished would shatter his trust in the village. Maybe he would go on a journey to find his true place in the world, away from the Hidden Leaf.
Another reason could be political. After the war, the power dynamics in the village might have changed. There could be new leaders or groups who saw Naruto as a threat to their authority. They might have plotted to make him look bad and turn the villagers against him, causing him to feel betrayed by the very people he fought for.
Obviously Naruto is one of the most important. His strength and his ability to inspire others are crucial in the Fourth War setting. He's the one who can turn the tides with his positive attitude and powerful jutsu.
One interesting plotline could be the resurrection of long - forgotten shinobi who play unexpected roles in the war. For example, some shinobi from the early days of the Hidden Villages might return with unique jutsu that change the tide of battle.
It could be some of the traditionalist elders in the Hidden Leaf. They might see Naruto as a threat even after the war, fearing his growing power and influence, and thus engineer his banishment. So they could act as antagonists as Naruto tries to find his place outside the village.
Perhaps Naruto and Yugao go on a mission outside the village after the war. They encounter some remnants of the enemy forces who are still causing trouble. Along the way, they bond over their shared love for the village and their determination to keep it safe. They might also discover new jutsu or abilities during this mission.
The fanfic could also focus on the personal lives of the characters. Naruto might finally have time to focus on his relationship with Hinata. There could be stories about how they build their family, and how Naruto balances his role as a family man with his duties as a hero of the ninja world. At the same time, other characters like Sasuke could also be exploring their new identities in a post - war world, trying to find their place and purpose.
The main characters are Naruto and Hinata, of course. Naruto is the hero of the Hidden Leaf Village, known for his determination and powerful ninja skills. Hinata is a kind - hearted and strong kunoichi from the Hyuga clan. In this fanfic, they are likely to be the central focus as they navigate life after the war.