Maybe a story where Bulma uses her scientific genius to help Batman upgrade his gadgets. She could be intrigued by his technology and offer her own unique insights. In return, Batman could teach her some of his detective skills, which she could use to help Goku and the others solve some mysteries on their own planet. And this could lead to an alliance between the Z - fighters and the Justice League.
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 cool concept would be if the Dragon Balls were brought into the DC universe. The heroes and villains of DC would be scrambling to get them. Superman might be interested in using them for good, while Lex Luthor would want them for world domination. Meanwhile, Goku and his friends are trying to protect the Dragon Balls from falling into the wrong hands in this strange new universe.
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.
Maybe a story where the Dragon Balls are accidentally sent to the DC universe. This would attract the attention of characters like Batman who would be intrigued by their power. Then, characters from Dragon Ball would have to travel there to retrieve them, leading to all sorts of encounters and battles.
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 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.
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 crossover with the Naruto universe. Goku and Naruto could team up to fight a common enemy. Maybe they face an evil villain who has the power - stealing abilities like Cell and the ability to use powerful ninja jutsus. Another plot could be a crossover with One Piece, where Luffy and Goku have a friendly competition about who can eat more food and then end up having to work together to defeat a new threat at sea that has the strength of Saiyans and the deviousness of pirates.
Well, a cool plot for Dragon Ball Xenoverse Crossover Fanfiction could be a time - traveling crossover. Imagine characters from different anime universes being brought to the Dragon Ball Xenoverse timeline. For example, characters from Fullmetal Alchemist arrive in the Xenoverse. Edward could use his alchemy skills against the Dragon Ball villains, and Alphonse could have some really interesting interactions with the Dragon Ball characters, like Bulma or Master Roshi.
One idea could be to have Goku and his friends end up in the RWBY world. They could team up with Team RWBY to fight a common enemy. For example, the Saiyans' power levels would be a huge asset against the Grimm. Another idea is to have Ruby Rose gain the ability to use Ki like in Dragon Ball Z. This would change the way she fights and add a new dimension to her character.
One idea could be that the Soul Reapers from Bleach team up with the Z - Fighters from Dragon Ball Z to fight a common powerful enemy. For example, a new type of demon that has the ability to absorb spiritual energy like in Bleach and also has the strength and fighting skills similar to the villains in Dragon Ball Z.
One idea could be that Broly is transported to an alternate universe where he teams up with Goku from a different timeline to fight a new, powerful enemy. They have to combine their unique fighting styles to stand a chance.