Yes, there are. You can find some on various fanfiction websites. Some might explore what would happen if Goku ended up in the Harry Potter universe, like how his powers would interact with magic. It could be really interesting to see Goku face off against Voldemort, for example.
First, you need to figure out how to bring the two universes together. Decide on a way for Goku Black to enter the Harry Potter world, like a magical portal or some kind of interdimensional rift. Then, think about how the characters will react to each other. Harry and his friends will be very different from the characters Goku Black is used to. You should also consider the power levels. Goku Black is extremely powerful, so how will the wizards' magic compare? You can start with a simple plot idea, like Goku Black being lost in the wizarding world and needing help to get back home.
The unique blend of two very different universes. Goku is from a world of super - powered battles and martial arts, while Harry Potter is set in a world of magic. Combining them means bringing together physical strength and magical power, which creates a lot of interesting scenarios.
It might be a story where Harry Potter, while exploring different magical texts or spells, stumbles upon a connection to the world of Goku. He starts to study Goku's fighting techniques and tries to incorporate them into his dueling skills. For example, he could learn about Goku's ki control and try to find a magical equivalent in the wizarding world. And he would be constantly in awe of Goku's ability to overcome seemingly impossible odds.
I'd say it's quite unique. Usually, fanfictions tend to stay within the same universe or at least related universes. But Harry Potter and Goku are so different. Harry has his wand and spells, while Goku has his ki blasts and transformations. So when you put them together like this in a fanfiction, it stands out as something different and not very common.
Harry's character would become more centered around self - improvement. Goku is always striving to get stronger. So Harry would constantly be looking for ways to improve his magical and physical skills. He might not be as reliant on his friends for support in difficult situations as he is in the original story, instead trying to handle things on his own more often. This could make him seem a bit more independent and self - sufficient.
Harry's character would transform significantly. Goku's carefree and positive attitude would rub off on him. He would be less brooding and more open - minded. His magic training might take a backseat initially as he gets immersed in learning martial arts from Goku. But as he grows, he would find a way to balance both. He would develop a new sense of self - worth, knowing that he is part of Goku's family. His relationships with others would also change. He might be more assertive in his friendships, and his leadership skills would improve as he watches Goku lead in battles. His magical abilities would become more fluid, as he adapts to using them in tandem with his newfound physical abilities.
Well, it could be really interesting. Harry would probably grow up with a very different set of values. Goku is all about strength and protecting the Earth in a very physical way. Harry might learn martial arts instead of magic at first. He could be more straightforward in dealing with his enemies, using punches rather than spells. And his idea of friendship might be more like Goku's, based on mutual respect for power and a shared goal of protecting those in need.
Well, in such a fanfiction, Harry Potter would probably gain some amazing physical abilities from Goku's training. He might be able to move at super - fast speeds and have enhanced strength. His magical skills could also be combined with Goku - like combat techniques, making him an even more formidable wizard in battles against Voldemort or other dark forces.
In this fanfic, perhaps Harry Potter is orphaned in a different way than in the original story. Goku stumbles upon him and, not really understanding the concept of magic at first but sensing Harry's good heart, takes him in. Harry would be introduced to Goku's friends like Bulma and Krillin. Bulma might be fascinated by Harry's magic and try to find a way to combine it with her technology. As for Harry, he'd have to adapt to a very different world. Instead of Hogwarts, he might train at Kami's Lookout. And his relationship with Goku would be one of a son - father figure, with Goku teaching him important values like never giving up and always protecting the weak, which would also tie in with Harry's own nature of fighting against evil in the wizarding world.