They could interact through training sessions. For example, Goku could teach some of the Naruto characters how to better control their energy, similar to ki control. In return, Naruto characters could show Goku and others some of their unique jutsu. In a harem setting, the female characters from both sides could be observing and learning as well, which would create interesting interactions and potential relationships.
They could also interact through a common goal. Let's say there is a dark force that threatens both the Dragon Ball Z universe and the Pride Lands. Characters like Gohan and Simba could lead their respective groups to fight this common enemy. Gohan could use his intelligence and fighting skills, while Simba would use his leadership and knowledge of the Pride Lands. In the process, they would share strategies and learn from each other's fighting styles.
Goku would probably be very excited to meet Naruto. He'd be interested in Naruto's unique abilities and might immediately challenge him to a friendly sparring match to test their powers. Naruto, on the other hand, would be in awe of Goku's Super Saiyan transformations and might try to learn from him. They would likely bond over their shared love for fighting strong opponents.
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.
He would probably interact with Goku. Goku loves strong opponents, and Saitama's power would surely draw his attention.
One idea could be that a character from Naruto's world somehow gets transported to the Dragon Ball Super universe and ends up in a harem situation. For example, Naruto himself could be sent there and due to his unique abilities and charm, attract the attention of various female characters like Bulma, Android 18, and Chi - Chi. Another plot could involve a new villain who uses the concept of a harem to manipulate characters from both universes, forcing them to work together to overcome this strange threat.
Regular Dragon Ball fanfiction usually focuses on battles, power - ups, and the main storylines from the original series. However, Vegito harem fanfiction centers around relationships. It's more about the emotional connections between Vegito and the multiple characters in his harem. The focus shifts from fighting villains to exploring the interactions and romances within the group.
There are fanfictions where the Gods play a more mischievous role. They might trick Naruto into thinking he's in his own world while actually placing him in the Dragon Ball world among its characters. Naruto would initially be confused but then start to interact with the likes of Vegeta and Gohan. He would have to quickly learn about their powers and find a way to fit in. This could lead to some interesting cultural clashes between the ninja way and the Saiyan way, all while the Gods watch and perhaps interfere from time to time.
Well, for example, Ezio from Assassin's Creed could meet Naruto. Ezio might be intrigued by Naruto's chakra and ninjutsu. In a harem setting, female characters like Sakura from Naruto and Evie from Assassin's Creed could be competing for the attention of both Ezio and Naruto. They could start off as rivals but then gradually form a bond due to the unique situation.
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.
A Super Saiyan in Naruto fanfiction could be a result of a dimensional rift. Maybe a portal opens between the Naruto and Dragon Ball universes and some Saiyan energy seeps through, affecting a Naruto character. This would be an interesting plot device as it would introduce an alien concept to the ninja world.