Well, it could be about someone who feels like a kid again while reminiscing about fanfiction. Maybe it's the sense of wonder and escapism that fanfiction provided during childhood that the person is recalling.
His relationship with Sasuke could be less competitive at first. Since Naruto has already lived through their intense rivalry, he might approach Sasuke in a more friendly and understanding way as a kid. He could try to prevent Sasuke from having some of the negative feelings that led to his later actions.
It could be an adult who had a very difficult childhood and is given a chance to go back and rewrite it. For example, a character who grew up in poverty and now gets to experience a better childhood.
Perhaps the kid is from a foreign land that Naruto visited during one of his missions. The kid could be an outcast in his own place because of some unique trait. Naruto, being the kind - hearted person he is, decides to adopt him. It could be that the kid has a different kind of chakra or a strange mark on his body that makes others afraid of him, but Naruto doesn't care.
One idea could be that the character relives their childhood during a magical time - like a time - traveling accident. They get to see their old friends and family members as they were, and re - experience the simple joys of childhood like playing in the park or having ice cream on a hot summer day.
Maybe he gets to relive his childhood but with a different mentor. Instead of Iruka, he could be mentored by someone like Kakashi right from the start. This would change his training methods and the way he approaches learning ninja skills. It could also lead to different relationships with his classmates as Kakashi might push him in different directions.
I don't have personal experiences as such, but I can imagine it would be really nostalgic. One might remember the first fanfictions they read, like how excited they were to find a new story about their favorite characters.
Well, if Naruto got the Rinnegan as a kid in fanfiction, it would completely rewrite the story. He'd have an edge in combat right from the start. With the Rinnegan, he could see chakra in more detail, which would make his learning of new jutsu easier. His opponents would be caught off - guard by his sudden access to such a powerful dojutsu. This could lead to some interesting plot twists, like him being able to solve problems in the village or against other ninja villages more quickly and efficiently.
Yes, there might be such a fanfiction out there. The idea of crossing over different fictional universes like Naruto's and Kid Flash's can lead to some really interesting and creative fan - made stories. It could explore how Naruto, with his ninja skills and determination, would react to the super - speed and powers of Kid Flash. Maybe he'd be in awe or try to learn from him in some way.
It's possible that the kid is a result of some sort of time - travel or alternate reality situation. Maybe the kid is actually Naruto from a different timeline or dimension, and Naruto has to figure out how to deal with this strange situation while on his training trip.