Well, one possibility could be the rebuilding of the ninja villages. After the war, there would be a lot of destruction to repair. Maybe Naruto and his friends would take on leadership roles in this rebuilding process.
There could also be a focus on the relationships between different characters. Some characters who were enemies during the war might now try to form alliances. Also, love relationships could develop further. For instance, Naruto and Hinata could start their new life together and face the challenges of building a family while also maintaining peace in the ninja world.
Anko might develop a softer side through her interactions with Naruto. She has a tough exterior due to her past, but Naruto's unwavering optimism and kindness could start to break down her walls. She could become more open and trusting towards others in general.
For Neji, he could develop more of an emotional side. In the original series, he was often stoic. In fanfiction, he might open up more, especially to Tenten. Maybe he starts to show his sense of humor or his fears. For Tenten, she could become more confident in her abilities. She's always been a strong fighter, but she might gain the confidence to take on more leadership roles within their team.
One possible plot development could be that the Hidden Villages struggle to maintain peace without Naruto's influence. His death might lead to power vacuums and political unrest. For example, some villages may try to take advantage of Konoha's weakened state. Another aspect could be how his friends and family cope. His wife, Hinata, might have to raise their children alone, and his friends like Sasuke would feel a great sense of loss and perhaps guilt for not being able to protect him. The ninja world as a whole could also lose its hope symbol, and new, darker forces might emerge, thinking that without Naruto, they can carry out their evil plans more easily.
Perhaps Naruto forms new alliances in this 'naruto after the war crossover fanfiction'. He might team up with characters from other fictional universes who got involved because of the crossovers. They could work together to restore peace not just in his world but also in the worlds that have been connected through the crossovers.
One possibility is that Naruto's friends launch a rescue mission. They would use their unique skills, like Sasuke's Sharingan or Sakura's medical ninjutsu combined with her combat skills, to find and save Naruto.
One possible plot development could be Naruto using his new jutsu to break Yugito free from an enemy's trap. Another could be that Naruto's words break Yugito's negative mindset.
There could be a plot where they discover a new threat to the villages while living together. They then use their combined skills and knowledge to investigate. Gaara's knowledge of the desert and its secrets could be combined with Naruto's intuition and quick - thinking. They might also find some ancient power or technique during their investigation that could change the balance of power in the ninja world. This would lead to them having to decide how to handle this new power, whether to keep it secret or share it with the other villages for the greater good.
A possible plot development could be that Naruto's connection to the Nine - Tailed Fox gives him an advantage in a situation where Shirou was at a disadvantage. For example, if there was a powerful dark force in the story, Naruto could use the Nine - Tailed Fox's power to fight it off, while Shirou might have struggled more. Also, Naruto's charisma could attract different allies compared to Shirou, and these new allies could bring in their own sub - plots and story arcs.
In the 'naruto has no eyes fanfiction', the plot might involve Naruto discovering a new form of chakra that is unique to his condition. This new chakra could give him abilities that he didn't have before, like the ability to sense the emotions of his opponents. There could also be a plot twist where Naruto's blindness is actually a part of a greater prophecy, and he has to fulfill it in a way that no one expected.
One possible plot development could be Naruto learning to master Samehada's unique abilities. Since Samehada can absorb chakra, Naruto might figure out a way to use this to his advantage in battles, like redirecting the absorbed chakra against his enemies.