In fanfiction, the concept of Naruto being Goku's reincarnation is not unheard of. Fanfiction writers like to blend different fictional worlds to create unique stories. If Naruto is Goku's reincarnation, it could mean that he has a different kind of chakra, perhaps more related to Ki energy from Dragon Ball. This could also affect his relationships with other characters. For instance, Sasuke might view Naruto's newfound powers with suspicion or envy, and Naruto himself might struggle to come to terms with his new identity that has roots in a completely different anime world.
One reason could be the popularity of both characters. Writers want to combine two well - loved anime heroes. Another reason might be the similarity in their underdog - turned - hero stories. Naruto was an outcast in his village at first, and Goku was a low - class Saiyan. So, by making Naruto Goku's reincarnation, it gives a new twist to Naruto's character development.
Perhaps the story could start with Naruto having strange dreams about Goku's life. As the story progresses, he gradually unlocks Goku's powers. He could then use these powers to protect the Hidden Leaf Village in a more powerful way. For instance, when the village is under attack by a powerful enemy, Naruto could transform into a Super Saiyan - like state, shocking his enemies and allies alike. His training would also change, as he'd have to learn to control his new Saiyan powers, which would be a whole new journey for him.
There's also the possibility that Orochimaru could be the main antagonist again. He might be intrigued by Naruto's new powers and try to experiment on him. Orochimaru is always after power and knowledge, and Naruto's Saiyan powers would be something he'd be very interested in. He could use his snake - like abilities and various jutsus to try and capture Naruto.
Goku's powers are on a much higher scale. His ability to destroy planets as a Super Saiyan makes him far more powerful than Naruto at his strongest. Naruto's jutsu are mainly focused on the ninja world, while Goku's powers are universal.
Their relationship could develop in a very interesting way. Given Naruto's background of being an outcast in his village at first, he might be a bit hesitant to fully embrace Goku as a brother. But Goku's open - heartedness would gradually break down those barriers. Goku would introduce Naruto to his friends in the Dragon Ball world, and Naruto would do the same in the ninja world. They would start to share their stories, like Naruto's fight against Pain and Goku's battles against Frieza. Through these shared experiences, they would grow closer and closer, until they are inseparable brothers who are ready to take on any threat to their combined worlds.
Naruto's ability to use chakra could give Goku a new way to power up. Maybe Goku could learn to combine chakra with his ki, creating a whole new level of power. Also, Naruto's shadow clone jutsu could be used by Goku in his training, allowing him to fight multiple opponents at once and improve his skills faster.
As for his relationship with the villagers, some might fear him more because of his connection to Indra. They could see him as a potential threat, like they did in the beginning when they were afraid of the Nine - Tails within him. However, others might see it as a sign of Naruto's importance and start to respect him even more, believing that he is destined for great things because of this reincarnation.
Well, Goku in the Naruto world would be quite an interesting scenario. Goku's training ethic might inspire the Naruto characters. He might also try to learn some of the ninja techniques. However, his raw power would likely overshadow most of the jutsu in the Naruto world. For example, his Super Saiyan transformations would be far more powerful than many of the ultimate ninja techniques.
For Goku Black reincarnation fanfiction, a plot could involve him being reincarnated as a half - Saiyan, half - something else (like a Namekian). This would give him new powers and a different perspective. He might be hunted by an organization that fears his power, and he has to find a way to either hide or use his powers to fight back. Along the way, he could encounter other characters who help him understand his new existence.