One idea could be that Goku and Naruto meet during a universal tournament. Goku, being his usual self, is excited to fight strong opponents. Naruto, on the other hand, is intrigued by Goku's pure love for combat. They could team up against a powerful enemy from another dimension who threatens both their worlds.
Another interesting plot could be that the Dragon Balls are somehow transported to the Naruto universe. Naruto and his friends set out to find them, thinking they are some kind of powerful ninja artifacts. Meanwhile, Goku and his friends also come to the Naruto universe in search of the Dragon Balls. This leads to a series of misunderstandings and battles before they figure out what's really going on.
One idea could be that Naruto and Goku meet during a interdimensional rift. They decide to have a friendly spar, with Naruto using his shadow clones and Rasengan while Goku goes Super Saiyan. Another could be that the Akatsuki are after the Dragon Balls for some reason, and the Z - fighters team up with the ninja of Konoha to stop them.
A crossover with One Piece might also be cool. Imagine Luffy and Goku teaming up. Luffy's rubber abilities combined with Goku's super strength could make for some really fun and unique battle scenes. They could be on a quest to find a powerful treasure that has both the power of the One Piece world and the Dragon Balls.
One idea could be a crossover with other popular anime like Naruto. Picture Goku meeting Naruto and having a friendly sparring match. Another could be a crossover with the DC Universe, where Vegeta and Superman have a showdown to see who's stronger. Or perhaps a crossover with the Final Fantasy series, with the Dragon Ball characters in a world filled with magic and summons.
One idea could be that Goku and Naruto meet in a strange dimension. They initially mistake each other for an enemy but then realize they have a common goal, like saving both their worlds from a new powerful villain. Goku could teach Naruto some of his ki control techniques, and Naruto could show Goku some of his more unique jutsu.
One idea could be a crossover with the Naruto universe. Goku and Naruto could have an epic battle or team up against a common enemy. Another idea is a crossover with One Piece, where the Z - fighters join Luffy's crew for a while. Or perhaps a crossover with Harry Potter, where the Dragon Ball characters have to deal with magic in the wizarding world.
Well, a cool plot might be that the Sage of Six Paths in Naruto has a connection to the Kais in Dragon Ball Z. This connection leads to a situation where Naruto and Goku have to work together to stop an ancient evil that threatens both universes. For example, the evil could be a powerful demon that feeds on both chakra and ki. They would have to combine their powers and the powers of their friends to stand a chance. Naruto could teach Goku some of his shadow clone jutsu, and Goku could show Naruto how to achieve Super Saiyan forms.
One idea could be a crossover with the Naruto universe. Imagine Goku meeting Naruto and them having a friendly sparring match. Another could be a crossover with the One Piece world, where the Z - fighters team up with the Straw Hat Pirates to take on a common enemy. And a crossover with the Harry Potter universe, with the Saiyans learning magic at Hogwarts.
A great 'Dragon Ball Super Crossover Fanfiction' concept might involve a crossover with the Harry Potter world. The Saiyans could visit Hogwarts. Maybe Vegeta could be really intrigued by the magic there and try to learn some spells, while at the same time the wizards are in awe of the Saiyans' power. There could be a dark wizard who wants to use the Dragon Balls for his own evil purposes, and the Hogwarts students and the Z - fighters have to work together to stop him.
One idea could be a battle between Goku and Superman. They could start off as rivals, each thinking their own planet needs more protection. As they fight, they gradually realize they have more in common than they thought, like their strong sense of justice. Then they team up to face a common enemy, like Darkseid and Frieza working together.
A crossover with the One Piece universe could also be cool. Imagine Luffy and Goku having a friendly competition to see who can defeat more enemies. The different power systems, like Devil Fruits and ki, would create interesting battles and interactions.