Naruto could be stronger in fanfic for several reasons. His Uzumaki blood gives him large chakra reserves. He also has a strong will, which helps him in battles. Moreover, he has learned from many great shinobi, not just Jiraiya, and has incorporated their teachings into his own fighting style, making him potentially stronger.
There are multiple factors. Naruto's unique connection to the Nine - Tails means he has access to a vast amount of chakra. He has also trained with different people and in different environments. His time on the journey with Jiraiya was just one part of his growth. In fanfic, writers can expand on his growth further, perhaps having him master new techniques that surpass Jiraiya's abilities. He also has the advantage of being the main character, so in fan - created stories, his power can be magnified more easily compared to Jiraiya.
One reason is his Nine - Tails chakra. It gives him a huge power boost that Jiraiya doesn't have. Another is his ability to learn quickly. Naruto has shown throughout the series that he can pick up new jutsu fast.
Yes. In many fanfics, Naruto is often depicted as stronger than Jiraiya. Naruto has the potential to grow far beyond his master. He has unique powers like the Nine - Tails chakra and has mastered many advanced jutsu over time, which can make him stronger in fan - created storylines.
One possible reason could be that in the fanfic, Jiraiya might have made a decision that Naruto strongly disagreed with, like leaving him alone at a crucial time for a long mission. This could make Naruto feel abandoned and thus start to hate him.
Well, Naruto has had the advantage of learning from many great shinobi over time. He also has a unique bond with his friends which could potentially give him more strength. Minato, on the other hand, had a shorter lifespan to develop his powers. Naruto has had more time to grow and surpass his father in strength.
One possible reason could be that Naruto feels he has learned all he can from Jiraiya at that point. Maybe he wants to explore his own path independently and test his skills without Jiraiya's constant guidance.
One possible reason could be that in this fanfic's unique plot, Jiraiya might have made a decision that Naruto strongly disagreed with. For example, Jiraiya could have been involved in some political intrigue within the ninja world that Naruto thought was against his ideals of justice and peace.
One reason is Naruto's vast chakra reserve. His Uzumaki heritage gives him an almost unlimited supply, which can be emphasized more in fanfic. So he can keep going in a fight longer than Kakashi.
One reason is that Naruto has the Nine - Tails' chakra. In fanfic, this power can be further enhanced or manipulated in ways that make him far more powerful than Sasuke. Another reason could be his more outgoing personality. He might be able to form alliances more easily, leading to him having more resources and power - ups at his disposal.
Often, in fanfic, Naruto is made stronger than Itachi because the writers want to explore new story arcs. If Naruto is stronger, new and exciting battles and relationships can be created. For instance, Naruto could be the one to protect Sasuke from Itachi in a different way. Also, Naruto's positive and determined nature makes him a popular character to be super - powered in fanfics.
One reason could be the variety of his abilities. Naruto has a whole range of jutsu like the Rasengan and Shadow Clone Jutsu. In fanfiction, these could be made extremely powerful. For instance, if his clones could multiply infinitely and each had the power of the original, that would be a huge advantage.
One possible reason could be that Naruto feels he has learned all he can from Jiraiya at that point. Maybe he has reached a level in his training where he believes he needs new experiences and challenges that Jiraiya can no longer provide.