One great 'Post War Naruto Fanfiction' is 'The New Era'. It focuses on how the characters rebuild their lives after the war. Another is 'Naruto: Post - War Reconciliation' which delves into the political and social changes in the shinobi world post - war.
There are several recurring themes. Reconciliation is a major one. Villages that were enemies during the war now have to find a way to coexist. This involves characters from different sides learning to trust each other again. Another theme is the passing of the torch. The older generation, having experienced the war, imparts their wisdom to the younger generation who will shape the post - war world. And of course, love and friendship are also common themes as they help the characters get through the difficult post - war times.
One great post - war Naruto Harry Potter fanfiction is 'The Crossover Chronicles'. It combines the magic of the Harry Potter world with the ninja skills of Naruto in a really interesting way. The characters from both universes interact in a post - war setting, which makes for some exciting plotlines.
One common theme is adaptation. Naruto and other characters have to adapt to the new world they are in during the crossover. For example, if it's a crossover with a modern - day world, they have to understand new technology and social norms.
Some Naruto post - war fanfiction might revolve around the new generation of ninjas. For example, the children of the main characters growing up in a world that's still recovering from the war. They could inherit the legacies and burdens of their parents. There could be a story about a young ninja who discovers a hidden threat that was left over from the war and has to convince the older generation to take action. Also, fanfictions might explore how the technology in the ninja world evolves post - war, like new types of jutsu or ninja tools.
Often, their relationship becomes more complex. They might have a deeper understanding of each other. For example, Naruto may confide in Sakura about his post - war nightmares, and Sakura could comfort him, bringing them closer on an emotional level.
One possible plot could be that in the parallel world, Naruto has to face new threats that emerged due to the chaos of the war. Maybe the villages that were once allies now have different power dynamics. For example, Konoha might have to deal with a new group of rogue ninjas who are using the post - war confusion to their advantage. Naruto, as the hero, has to use his skills and wisdom to unite the villages again and stop this new menace.
One common theme is the rebuilding of the Hidden Villages. After the war, there's a lot of destruction to repair. Another theme could be the characters dealing with their post - war trauma. For example, Naruto might struggle with the memories of the battles and the losses. Also, the relationships between different villages change, like Konoha and Suna might have new alliances or trade agreements which is often explored in such fanfictions.
One possible plot could be Naruto struggling to adapt to the magical world. He might try to use his ninja skills in Hogwarts, which could lead to some hilarious situations. For example, he might attempt to run up the walls using chakra in a magic - filled corridor and startle the other students. Also, his strong sense of justice would likely make him stand up against any dark magic threats in Hogwarts, just like he did in his own world.
You can start by looking on fanfiction websites such as Archive of Our Own (AO3). It has a large collection of Naruto fanfiction, and you can use the search filters to specifically look for post - war stories. Another good place is FanFiction.net. There are many Naruto fans who post their works there, and you can search for post - war related tags or summaries. You could also check out Naruto - focused forums where fans might recommend their favorite post - war fanfictions.