In a fanfiction where Naruto befriends Sasuke early, the Akatsuki's plans might be disrupted. Since Sasuke would be less likely to go rogue in search of power, the Akatsuki would have a harder time recruiting him. Also, the relationship between Naruto and Sasuke could inspire other characters. For example, Sakura might see a different side of Sasuke and Naruto's bond could make her more determined to be a better ninja herself. The whole ninja world dynamic would be different as their friendship would have a ripple effect on many events and characters.
It can make Naruto stronger earlier. Since he and Kurama are friends, he can access Kurama's power more easily. This would change the power balance in battles. For example, in a fight against Orochimaru, Naruto could use Kurama's power more effectively and defeat him sooner.
He would be more confident. Without the constant internal struggle with Kurama, Naruto would have a more stable mental state. He could focus more on his ninja goals and less on suppressing Kurama's negative influence.
A really interesting fanfiction is 'The Forgotten Beginning'. It delves into a scenario where Naruto and Sasuke are friends long before the academy. They grow up side by side, and this early friendship shapes their characters in unique ways. For example, Sasuke becomes more open and Naruto becomes more focused because of their influence on each other. It's a different take on the Naruto - Sasuke relationship that gives a fresh perspective on the whole story.
Well, if Sasuke finds out Naruto is a girl in fanfiction, it could completely change their dynamic. Maybe Sasuke would start to see Naruto in a new light, perhaps more protectively. Their relationship might become more romantic as Sasuke realizes his feelings for Naruto are different from what he thought. It could also lead to some interesting plot twists, like Sasuke having to re - evaluate his rivalry with Naruto.
If Naruto gives up on Sasuke in fanfiction, the storyline could take a very different turn. For one, the whole dynamic of their relationship, which has been a central part of the original Naruto story, would be completely disrupted. Naruto has always been determined to bring Sasuke back to the village. Without that drive from Naruto, Sasuke might become even more isolated and perhaps fall deeper into the darkness. This could also lead to different power alignments in the ninja world. Allies of Naruto might question his change of heart, and enemies could take advantage of the rift between the two former friends.
If Sasuke were secretly a girl, it would change the nature of the rivalry with Naruto. Their relationship might have a different dynamic, perhaps with more underlying romantic tension from the start. Also, Sasuke's relationships with other characters like Sakura would be completely different. Sakura might be more jealous or more protective depending on how she perceives Sasuke as a girl.
This fanfiction changes the power balance within Konoha. Sakura was growing to be a capable kunoichi. Her death would mean a loss of potential power and knowledge for Konoha. Also, it could lead to a rift between Sasuke and the village. Instead of being a potential ally or a wayward ninja, he becomes a murderer, and Konoha would have to deal with him differently.
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.
In most of these fanfics, the friendship develops through Naruto's persistence. He refuses to let Sasuke go, whether it's physically or emotionally. For example, in some stories, Naruto follows Sasuke on his travels, constantly trying to talk to him and remind him of their bond. Also, shared experiences play a big role. When they face a common enemy or a difficult situation together, it makes them rely on each other more and thus strengthens their friendship.
The story would deviate from the original themes of unity and friendship. Naruto's hatred could split Konoha into factions. This would mean different training regimens, different missions, and different loyalties. For example, Naruto might start his own group of ninjas who share his views, which would completely change the power dynamics in the village.