In fanfiction, when Goku meets the Saiyans, it might be a chance for him to learn more about his own race. He could discover new Saiyan techniques and powers. There could also be conflicts among the Saiyans themselves regarding Goku. Some might see him as a threat, while others might see him as a potential ally or leader.
Goku's kind - hearted personality would likely make him approach the Saiyans with an open mind. He wouldn't immediately start a fight unless they threatened Earth. His love for a good fight might also lead him to spar with the Saiyans to test his strength against his own kind.
In the Dragon Ball novel, the Saiyan race doesn't really have a specific 'God of Saiyans' in a traditional sense. However, some might consider characters like King Vegeta to have a kind of god - like status among the Saiyans due to his leadership position.
Saiyans in the Dragon Ball novel are very proud. This pride is related to the 'God of Saiyans' idea in that they see themselves as a superior race. They have an inborn sense of combat ability and a tail which is a unique physical feature. Their ability to transform, like into a Super Saiyan, also adds to their 'god - like' aura in a sense. When they transform, they gain extraordinary power, and this power - seeking nature can be linked to the concept of a 'God of Saiyans' as they are always striving for a higher level of power, much like a god would be seen as all - powerful.
A possible fanfiction could focus on a group of Saiyans who are trapped in a dimension where they can only watch the Goku vs Frieza fight on repeat. They start to notice small details in the fight that they hadn't before, like the exact moment Goku's power level spikes or how Frieza is trying to adapt his strategy. This newfound knowledge could then be used by them in some way when they eventually break free from that dimension.
Trunks would also be interested. He has his own experiences with fighting powerful foes and would be eager to see how Goku, a great Saiyan warrior, fares against Frieza. Also, the younger Saiyans like Goten might be interested. They've heard stories about Frieza and would be excited to see their father or other Saiyan heroes in action against such a notorious villain.
Another possible main character could be the villain that forces the two Gokus to meet. This villain could be a new, super - powerful threat that the two Gokus need to deal with. Their meeting becomes a crucial part of the story to defeat this powerful foe.
Well, it could be about Goku Jr learning some of Goku's most powerful moves. Maybe Goku teaches him the Kamehameha. They might also go on an adventure together, like fighting a new and powerful enemy that neither could face alone.