Well, one possible plot could be Naruto coming back to the village and being hailed as a hero. He might then focus on rebuilding the parts of the village that were damaged during the Pain attack. He could also start training the next generation of ninja, sharing his newfound wisdom and strength.
It could be a rogue ninja from another village who sees Naruto's victory as a threat to their own plans. Maybe they were planning some sort of takeover or power play and Naruto's new - found status throws a wrench in their plans.
In this kind of fanfiction, Naruto might be welcomed as a hero. The village could start to rebuild with his leadership. People would look at him with newfound respect and admiration.
Often, Naruto's relationships with other characters are explored further. He might have deeper conversations with Sasuke, trying to convince him to come back to the village for good. His bond with Sakura could also develop in different ways, perhaps becoming a stronger friendship or even something more romantic in some fanfictions.
Another development could be that Naruto starts to understand the world outside the Hidden Leaf better. His encounter with Pain, who had his own ideology about peace, makes Naruto question his own views. So, he might embark on journeys to other villages to learn more about different cultures and ways of achieving peace, which in turn changes his perspective on many things.
Unique character development. In a great fanfiction, Naruto's growth from the start of the battle to the end should be significant. He could learn new skills or gain a deeper understanding of himself. For instance, he might realize the true meaning of being a ninja during the fight with Pain.
One of the most thrilling moments could be when Naruto taps into a new level of his Sage Mode. In the fanfiction, he might have an enhanced form that gives him an edge over Pain. He could move so fast that Pain's attacks can't even touch him, and his jutsu become super - powerful. It's like seeing a new Naruto, one who has truly grown into a force to be reckoned with.
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.
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.