Some of the Z - Fighters like Goku might be a bit surprised at first, but he would probably be open - minded and give them his support as long as they are happy. Vegeta, on the other hand, might be more critical and think it's an odd pairing.
The younger Z - Fighters like Trunks and Goten's friends would probably be more accepting. They are from a new generation and are more open to different kinds of relationships. They might even be excited for Goten and see it as something new and interesting. Overall, the reception would be a mix of different reactions depending on the personalities of the Z - Fighters.
Piccolo would likely be very observant. He would watch their relationship closely to see if it has any negative impacts on the group dynamic or their ability to protect the Earth. But if it doesn't, he would probably just let it be. Krillin, being a good friend of Android 18, would be a bit hesitant at first but would come around if he sees that Goten makes her happy.
In some fanfictions, their relationship could take a romantic turn. Maybe after going through a lot of adventures together, they start to see each other in a different light. They would then have to deal with the reactions of their friends and family, which would add more drama to the story.
Naruto's chakra - based powers would contrast with the ki - based powers of the Z Fighters. His Rasengan, which is a concentrated form of chakra, could potentially be combined with the energy blasts of the Z Fighters. For example, Goku could add his ki to Naruto's Rasengan to create an even more powerful attack. Also, Naruto's ability to transform, like his Nine - Tails Chakra Mode, would give him an edge in terms of raw power and speed, which could be on par with some of the Super Saiyan forms of the Z Fighters.
Krillin would probably be one of the first to be accepting. He's always been Goku's friend and would likely see Goku's inner strength regardless of the physical form. He might even joke about it a bit at first. Vegeta, on the other hand, would be initially shocked and perhaps a bit dismissive. But as he sees Goku's power in the new form, he would gradually come to respect it. Gohan would be very curious and would want to know how this transformation happened and what it means for their future battles.
One way is to put them in a difficult situation together. Say they are stranded on an alien planet. Chichi would have to rely on Goten's Saiyan powers to survive and Goten would have to listen to Chichi's wisdom. This would force them to understand each other better and strengthen their bond.
Well, Naruto joining the Z Fighters would mean a lot of cultural exchange too. Naruto comes from a world with a complex ninja society, and the Z Fighters are from a more science - fiction - like world. Naruto might introduce concepts like chakra control and different ninja clans to the Z Fighters. And the Z Fighters could show Naruto their advanced technology and spaceships. In terms of battles, Naruto's shadow clone jutsu could be used to confuse enemies, while the Z Fighters' super - fast punches and kicks would be a new sight for Naruto. They could learn from each other and become even stronger as a team.
A lower power level might make Goten more cautious in his time - traveling adventures. He might have to rely on stealth and his wits more than his strength. For instance, when traveling to a time where powerful villains are present, he'd need to find ways to avoid detection rather than directly confront them. However, his power could gradually increase as he learns new techniques in different time periods, which could then change the course of the time travel events.
Well, Goten and Videl are characters with a lot of potential for interesting stories in fanfiction. In lemon fanfiction specifically, there could be a focus on their romantic and more intimate moments. But this type of fanfiction may not be for everyone as it can be quite out - of - the - ordinary compared to the original source material. It might also take some liberties with the characters' personalities to fit the more romantic or steamy scenarios.
They would become more responsible. Their relationship would no longer just be about their own feelings and desires. Now they have a child to think about, so they would have to work together more closely.
The other Z - fighters will surely feel his absence. Vegeta, for example, might be frustrated. He was always in competition with Goku and Gohan's power. Now that Gohan has left, he might feel like there's no one worthy to compete against. Piccolo, who has a special bond with Gohan, will be worried. He'll probably go looking for Gohan at some point, fearing that something bad has happened to him.
One great fanfiction is 'Goku and Goten's Training Days'. It focuses on Goku teaching Goten new techniques. It's really exciting as it shows their father - son bond through the training sessions.