It could also lead to changes in the power dynamics. Without Naruto, Akatsuki might see the Hidden Leaf Village as an easier target. However, the village could also discover new heroes among the younger generation. The remaining characters would have to find new sources of inspiration and strength.
Mentally, it would be a huge blow to the ninja community. Naruto inspired many with his never - give - up attitude. His death might make some ninjas lose faith in their own abilities and the future. But on the other hand, it could also fuel the determination of some to become stronger in his memory.
I'm not sure specifically as there could be many different takes in a fanfic with that title. It might be about a character in Naruto who endures some sort of unending pain, perhaps related to their past traumas, like Naruto himself who has the pain of being an orphan and ostracized for so long. Or it could be about a villain like Sasuke who has his own internal pain that never seems to go away.
Since I haven't read it, I can't say for sure. But it could be Naruto, as he is the main character of the original series and has a lot of pain in his past. It might also focus on Sasuke, who has his own set of traumas and pain related to his family and his quest for revenge.
One possible plot development could be Naruto's internal struggle with the newfound power and responsibility. He might start to question his own limits and how to better protect the village in the future. Another could be the rebuilding of Konoha. Naruto could be deeply involved in the restoration efforts, both physically and mentally, trying to bring back the hope and strength to the villagers.
In a 'naruto after pain fanfic', Naruto is key. However, characters like Tsunade are important too. She can lead the medical and administrative aspects of the village's recovery. Then there are Naruto's friends like Kiba and Choji. They can help with the physical tasks of rebuilding, and also in the security patrols around the village to prevent any new threats.
Sakura could play an important role. She might be more concerned about Naruto's well - being after such a tough fight. She could also use her medical skills to help in the rebuilding of Konoha. Kakashi, too, could be significant. He could guide Naruto in understanding his new powers better and also contribute to the village's security plans.
His fighting style could become more aggressive. Without the fear of pain, he might be willing to use more extreme techniques that would otherwise be too dangerous because of the pain they cause to the user. He could push his body to the limit more often.
One possible plot could be Naruto and Ino working together to help rebuild the village after Pain's attack. They might bond over their shared experiences and grow closer as friends or even develop romantic feelings. They could also be involved in training the new generation of shinobi to prevent future attacks.
In a 'naruto after pain fanfic', a great plotline could be the political changes in the Hidden Leaf. Naruto might get involved in restructuring the village's leadership and security systems. He could also encounter new enemies who see the village as vulnerable after Pain's assault. And there could be a sub - plot about how the other ninja villages react to the Hidden Leaf's situation and Naruto's growing influence.