Well, he might face a lot of challenges. Since he graduated early, he may not be fully prepared in terms of combat skills and ninja knowledge compared to his peers. For example, he could struggle in his first real missions. But on the positive side, his determination would drive him to quickly catch up. He might seek extra training from Kakashi or other jounin. Also, his early graduation could inspire others in the academy to work harder.
Their relationship could become more competitive earlier. Since Naruto is now out of the academy early, Sasuke might see him as an even greater threat. He may feel pressured to prove that he is still the better ninja. On the other hand, Naruto might be more eager to show Sasuke that he is just as good, even without the full academy training.
One possibility is that Naruto has a secret training regime that he has been following. This extra training gives him an edge over his classmates. He could then participate in a tournament within the academy where he completely outperforms everyone. His display of strength, speed, and strategic thinking would be so impressive that the academy decides to graduate him early.
His relationship with Iruka could change in that Iruka might start to worry more about Naruto. Since he graduated early, he's going to be in more dangerous situations sooner. Iruka could be constantly on edge, trying to make sure Naruto is prepared for everything that comes his way, while also being happy for his achievement.
Well, in such a fanfiction, Naruto might face new challenges earlier. He could be thrown into more dangerous missions right away. Maybe he'd have to quickly prove himself to his peers and superiors who are skeptical of his early graduation.
It could be Orochimaru. Even though Naruto graduates early, Orochimaru might see him as a threat and try to eliminate him. Orochimaru is always on the lookout for powerful ninja to either recruit or destroy.
In this fanfiction, Naruto's character development could be quite complex. His early graduation could isolate him from his peers initially. This loneliness might drive him to prove himself even more. He would also have to grow up faster, taking on responsibilities like protecting the village at a younger age. This could make him more mature, but also more reckless as he tries to live up to the expectations of being a prodigy. He'd have to learn to balance his newfound status with his true self, the Naruto who just wants to be recognized and loved by the village.
In the fanfic, Naruto's training might be more intense and rushed. Since he graduates early, he may not have had as much time for basic training. So, he could be learning advanced jutsu before he has a solid foundation in the basics. For example, he might start learning more powerful Rasengan variations earlier.
One possible plot twist could be that Naruto's early graduation leads to him facing much stronger opponents right away. He might not be fully prepared mentally or skill - wise, and this could result in some serious challenges that force him to grow up quickly. For example, he could be sent on a mission with high - ranking ninjas where he has to prove himself.
One possible reason could be his natural determination. Naruto is highly motivated to become Hokage. In fanfiction, this drive might lead him to study extra hard and show extraordinary progress, convincing the academy instructors to let him graduate early. For example, he could be spending all his free time training and studying ninja techniques instead of goofing off like some of his peers.