Well, perhaps Gohan goes back in time to save his father, Goku, from some early danger. He could then train alongside Goku when they were younger, leading to a much stronger Goku earlier in the timeline. This could also have a ripple effect on the relationships within the Z - fighters. For example, with a stronger Goku earlier, their battles against the Red Ribbon Army or other villains might be much easier and quicker.
His return could have a huge impact on the power balance. Since Future Gohan is a powerful fighter, his presence could tip the scales in battles against villains. For example, in fights against the Saiyans or the androids, his skills and experience could give the Z - fighters an edge.
His sense of responsibility would grow even more. Knowing the future, he would feel an even greater obligation to protect everyone. He might be constantly on guard and take on a more leadership role among the Z - fighters, guiding them in their training and battle strategies. He would also probably be more patient with the younger versions of his friends and family, understanding their potential better.
Gohan will most likely encounter other Z - fighters like Krillin and Tien. They were all part of the group back then. Also, there's a good chance he'll meet Master Roshi. Roshi was a key figure in Goku's training, so his interaction with Gohan could be really interesting. He might also come across Bulma, who was always involved in the Dragon Ball story, either by accident or because he needs her help with some time - related technology or something.
In this fanfiction, Gohan might change important events in the past. For example, he could prevent certain villains from getting stronger or save characters who died previously.
Another thing that could occur is that he might accidentally create new threats. By interfering with the past, he could disrupt the natural flow of events and cause new villains to emerge or existing ones to become more powerful in different ways. It's a risky move going back in time, even in fanfiction.
In fanfiction, Gohan could have an encounter with a wolf in many ways. Maybe the wolf is a magical or mutated creature in a story where Gohan has to protect the forest it lives in from some greater evil. The wolf could also be a spirit guide of sorts, leading Gohan to a new power or a hidden place full of secrets.
Obviously, Gohan would be the main character. Videl could also be in it as a classmate or a potential love interest. Piccolo might keep an eye on Gohan from afar to make sure he doesn't get into too much trouble. And of course, Gohan's friends from previous adventures could make cameo appearances, like Krillin dropping by the school sometimes.
In this fanfiction, Gohan might face the challenge of hiding his Saiyan powers from his classmates. He could also make new friends who are interested in different things like academics or sports, and he has to balance his high school life with his training as a Saiyan warrior.
Well, he might use his powers secretly. Like, he could use his super speed to be on time for every class without even breaking a sweat. And when there's a bully in school, he could give them a little scare with his strength, but not too much to expose his true identity.