In a Goku Naruto crossover, both characters have their own strengths. Goku's physical strength and energy attacks are off the charts. His ability to instantly teleport and sense ki gives him an advantage in combat. Naruto, though, has a unique power system. His connection to the Nine - Tails and his ability to use different types of chakra make him a force to be reckoned with. If we consider a battle, Goku's power might seem greater on the surface. But Naruto has the advantage of being able to surprise his opponents with his ninjutsu and clones. Also, Naruto has a strong willpower that has allowed him to overcome many tough situations, which could play a role in a fight against Goku.
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.
Well, Naruto would probably become extremely powerful. Goku's training methods are intense and focus on pushing physical limits. Naruto, with his already strong will and chakra, could gain new levels of strength. He might learn how to better control his chakra in ways similar to how Goku controls his ki. Also, Goku could teach Naruto some of his signature moves, like the Kamehameha, which Naruto could potentially adapt to his own style using chakra.
Well, it could be that Goku somehow ends up in the Naruto universe and has a son with a female character there. And this son has both the powers of a Saiyan like super strength and the ability to use chakra for jutsus. Maybe he's an outcast at first because of his strange powers but then becomes a hero.
If Naruto were trained by Goku Black in fanfiction, it would be a wild combination. Goku Black is from a different universe with different power systems. He could introduce Naruto to concepts like ki, which might blend with Naruto's chakra in interesting ways. Naruto's physical abilities would likely skyrocket, and his combat strategies would be completely revolutionized. He might start using more acrobatic and flashy moves, like Goku Black does.
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.
A rogue ninja who has made a pact with dark forces. He wants to use Goku's son to open a portal to the Saiyan planet and then invade it. He would be constantly trying to manipulate the situation to get Goku's son to do his bidding. He has a team of minions who are also skilled in both ninjutsu and some dark form of ki - like powers.
One interesting crossover could be a battle scenario where Goku Black's power and Naruto's ninjutsu clash. For example, Goku Black's hakai energy against Naruto's Rasengan. Another could be a story where they team up to fight a common enemy, perhaps an even more powerful villain from another dimension.
Goku Black, with his dark and self - assured nature, would be a contrast to Naruto's more open and friendly personality. Naruto would be eager to understand Goku Black's motives, but Goku Black might be dismissive. However, as time goes on, Naruto's unwavering belief in the good of others could potentially start to wear down Goku Black's cold exterior, leading to an interesting dynamic.