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.
Naruto is stronger in fanfiction because of his ability to connect with others. He has made friends all over the ninja world. This network of friends often provides him with support in battles, whether it's intel or actual combat help. Also, his training under Jiraiya was very comprehensive. Jiraiya taught him not only combat skills but also how to be a better person. This made Naruto grow both physically and mentally. And compared to Sasuke, Naruto seems to be more adaptable to different fighting styles in fanfiction, which gives him an edge in combat.
There are fanfictions where Naruto, using his Uzumaki clan's sealing techniques along with his chakra, is able to break through Sasuke's genjutsu. Genjutsu is one of Sasuke's strong points usually, but Naruto's unique abilities give him the upper hand. Also, in certain stories, Naruto's connection to the nature energy in his Sage Mode is so strong that he can heal himself during a fight with Sasuke, while Sasuke doesn't have such a convenient self - healing ability.
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.
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One great 'naruto luffy fanfic' is 'The Adventure Beyond Worlds'. It combines the unique abilities of Naruto and Luffy in an exciting new story where they team up to face a powerful common enemy.
There are definitely some. For example, some fanfictions might depict Naruto getting his hands on a Devil Fruit in a strange way and then being inspired by Luffy's fearless attitude towards using his powers. These stories often play with the different power systems and character traits from both series, making for really engaging reads if you're into crossovers.
Naruto might give Luffy training in stealth. Since Naruto is a ninja, he is well - versed in moving around unnoticed. Luffy, on the other hand, is more of a straightforward fighter. So Naruto could show him how to approach enemies without being detected first, which would be a new and useful skill for Luffy in his pirate adventures.