Well, Naruto himself might be really focused on Pain's motives in the fanfiction fight. Since he always tries to understand his opponents. Sasuke could be analyzing Pain's jutsu and thinking about how it compares to his own power. And Sakura might be worried about the destruction caused, just like she was in the original story when Pain attacked the village.
Some characters may gain new respect for Pain's power. If the fanfiction shows Pain in a more complex light, characters like Naruto could start to see him not just as an enemy but as a complex individual with his own reasons for fighting.
I'm not sure which is the absolute best, but 'Naruto and the Spectacle of Pain's Battle' is another one that stands out. It has some unique interpretations of the fight, like how Naruto analyzes Pain's techniques in real - time and how that affects his own future battles. The writing style is engaging and it keeps you hooked from start to finish.
You can try searching on fanfiction websites like FanFiction.net or Archive of Our Own. They usually have a wide range of Naruto fanfictions, and you might be able to find one about Naruto watching the fight with Pain there.
One possible plot could be that Naruto from the past somehow gets a glimpse of the future of Konoha. He sees new threats emerging and starts training in ways that can counter those threats in the future. He might also try to influence the present actions of his friends and allies based on what he saw in the future.
It could be a time - traveling enemy from the future who wants to stop Naruto from changing things. This antagonist might have his own motives for wanting the future to remain as it was, like having power over a ruined Konoha.
There's no way to tell who the author is just from the title 'percy feels the pain of the past fanfiction'. It could be written by a relatively unknown fanfiction writer or someone who just started writing in the fandom. There are countless fanfiction platforms, and it could be on any one of them, making it difficult to track down the author without more details.
In some fanfictions, Naruto's pain might manifest through his actions. For example, he could become withdrawn and isolate himself from his friends. This is because Naruto has always been a social person, so any deviation from his normal behavior could be a sign of his internal pain.
One possible cause could be his sense of failure. Naruto always wants to protect his friends and village, so if he fails in a mission or is unable to save someone, it can cause him great pain.
The 'naruto pain into power fanfiction' could potentially rewrite Naruto's character arc in a unique way. It may show him in situations where he is pushed to his limits by pain, more so than in the original series. This extreme pain could lead to a more profound and perhaps unexpected transformation of his power. For example, he might discover a hidden power within himself that was only unlocked through experiencing a great deal of pain. This could also lead to new plot twists and interactions with characters like Sasuke or Kakashi, as they react to this new, more powerful Naruto who has emerged from his pain.