In fanfiction, Naruto's connection to the Nine - Tails could be amped up. Maybe he can fully control the Nine - Tails' power and even merge with it in a more powerful way than ever before. This could give him a power boost that might make him stronger than Goku. Also, his ninja skills like stealth and deception could be used in a way to outwit Goku.
The world of Naruto has a different power system compared to Dragon Ball. In fanfiction, the writers can manipulate this system to favor Naruto. For example, the concept of chakra can be redefined in a way that makes Naruto's chakra supply infinite or his ability to regenerate chakra instant. This, combined with his already existing skills and the potential for new ones, could potentially put him above Goku in the fan - created story.
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.
In fanfiction, it's possible for Naruto to be stronger than Goku. Fanfic writers often tweak the power levels and rules of the characters' universes. For example, if the fanfic writer decides to nerf Goku's Saiyan abilities while enhancing Naruto's Sage Mode and all his ninja skills to an extreme level, Naruto could end up being stronger.
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.
In some fanfics, Naruto can be made stronger than Goku. Fanfic writers have the freedom to manipulate the power levels and abilities of characters. They can give Naruto new and overpowered abilities that surpass Goku's. However, in the original canon of their respective series, Goku has extremely high power levels and abilities that are on a different scale.
One reason could be Naruto's unwavering determination. He has always been able to push past his limits. In many battles, his willpower has been a key factor in his victory. Another could be his unique chakra nature and the amount of chakra he has at his disposal. Naruto has a vast reserve of chakra, which gives him an edge in long - drawn battles. Also, his ability to form strong bonds with others might contribute. These bonds could potentially unlock new powers or give him the strength to fight against Kaguya.
In fanfiction, Naruto can be stronger than Madara for multiple reasons. Some authors might want to subvert the expectations set by the original story. They could give Naruto unique abilities like the ability to manipulate time, which would clearly put him above Madara in terms of power. Additionally, it could be a way to bring in crossovers. For instance, if Naruto gains powers from another fictional universe, he could easily be made stronger than Madara. Moreover, the author may simply want to explore a scenario where Naruto is the most powerful character, and making him stronger than Madara is a step towards that.
One reason could be a new magic source. Natsu might discover a powerful magic that surpasses Gildarts' abilities.
In most cases, they are depicted at similar levels of strength. But it can vary depending on specific story arcs and interpretations.
In most cases, they are considered equally strong. The power levels in both the anime and manga are often presented in a similar manner.
One thing could be unique chakra abilities. If in a fanfic, Naruto discovers a new form of chakra that gives him unlimited power, he could be stronger. For example, a chakra that can nullify all energy - based attacks like Goku's ki blasts.
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.