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.
Goku would be really excited to meet all the different heroes in the DC universe. He'd probably want to spar with everyone right away. Flash would be intrigued by Goku's ability to move at high speeds using his Ki. They could have a friendly race or competition to see who's faster in different situations. At the same time, Piccolo could team up with Martian Manhunter. They both have the ability to sense things from a distance and could use their skills to detect threats to both universes.
It's really hard to say. Goku has his Super Saiyan forms which give him incredible power boosts. But Superman has super strength, heat vision, and is nearly invulnerable. In a short fight, Superman might have the edge due to his instant powers like flight and super strength without having to power up. But if Goku manages to reach his higher Super Saiyan forms and uses techniques like the Spirit Bomb, he could potentially defeat Superman.
One great 'Dragon Ball' crossover fanfiction is 'Dragon Ball x Naruto: The Saiyan Ninja'. It combines the high - energy battles of 'Dragon Ball' with the ninja - based world of 'Naruto'. The story often has interesting power - up scenarios where the characters from both universes learn from each other's fighting styles.
The Dragon Ball system in the DC world novel would likely bring a whole new level of power dynamics. The Dragon Balls' ability to grant wishes could disrupt the existing power balance in the DC universe. For example, villains could use the Dragon Balls to gain ultimate power or immortality, which would pose a huge threat to superheroes like Superman or Batman. However, heroes might also use the Dragon Balls for good, such as wishing for the restoration of a destroyed city or bringing back fallen comrades.
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.
A common theme is the exploration of different power systems. Like how the martial arts in Ranma 1/2 compare to the ki - based powers in Dragon Ball Z.
Another aspect to consider is how the Super Saiyan transformation would affect the relationships in the Naruto world. If Sasuke were to gain Super Saiyan powers, it could either drive him further away from Naruto due to the newfound power or bring them closer as they explore the new abilities together. Also, the concept of ki from Dragon Ball and chakra in Naruto could be merged, creating a whole new type of energy for the characters to utilize.
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.
In some fanfictions, Vegeta might team up with Batman. Vegeta's combat skills and Batman's strategic mind would make for a great combination. They could work together to take on a powerful villain that threatens both the Dragon Ball Z and DC Universe. For example, a villain who has the ability to steal energy like Cell and the mind - controlling powers of Brainiac.