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.
Some characters might be inspired by the concepts. For instance, if a fanfiction has a really cool new power - up idea for Gohan, he might think about how he could develop in a similar way in his own world.
Often, they start off as strangers. The Poison Dragon Slayer might be confused by the Ninja way of life, like the use of hand signs for jutsu. Naruto, being the friendly and curious type, would approach the slayer and try to understand their powers. They gradually build a friendship based on mutual respect for each other's abilities.
Often, they start off as rivals. For example, Naruto might see Goku as a powerful opponent and want to test his skills against him. Then they gradually become friends as they realize they have common goals, like protecting their respective worlds. They also exchange fighting techniques. Naruto could teach Goku about ninjutsu, and Goku could show Naruto how to better control his energy, like ki or chakra in a new way.
Characters may ride their dragon mates in some fanfictions. It's a very exciting and dangerous thing. They need to build trust with the dragons first. For example, a character has to prove their loyalty to the dragon by protecting it from poachers. Then, they can soar through the skies together.
They often interact as powerful allies. They respect each other's strength since they are both the result of fusing two extremely strong Saiyans. For example, they might exchange fighting techniques or strategies.
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.
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.
In fanfictions, their interaction can be complex. Dark Naruto might be initially distrustful of Mikoto, seeing her as part of the system that failed him. But Mikoto, with her kind heart, tries to reach out to him.
In many fanfictions, Naruto's exuberant and determined personality often draws Saeko in. He might show his love through grand gestures or by simply being there for her during tough times. Saeko, on the other hand, with her own set of skills and charm, complements Naruto. For example, in some stories, she might be the one to calm Naruto down when he's about to rush into a dangerous situation out of his eagerness.
Often, Pinkie Pie's bubbly and friendly nature breaks through Naruto's more serious exterior. For example, in some fanfictions, she might throw a party for Naruto when he first arrives in her world, and Naruto is initially confused but then starts to enjoy it.