One possible plot could be that future Gohan travels back in time to warn the past about an upcoming threat that was not properly dealt with in his own timeline. He might meet the past version of himself and try to train him to be stronger, sharing his knowledge of the future battles. Maybe he also meets the past versions of his friends and family, and has to convince them of the seriousness of the situation without revealing too much about the dark future he comes from.
In a 'future Gohan meets past' fanfiction, the plot could involve future Gohan arriving during a crucial moment in the past. For example, he could show up during a big tournament. His presence would shock everyone. He might then seek out the Z - fighters from that time. He could start by training the past Gohan, showing him new techniques. This could lead to a series of events where the past characters start to prepare for a threat they didn't know existed before. The story could also explore how future Gohan copes with seeing the past versions of those he has lost in his own timeline.
Well, in such a fanfiction, perhaps future Gohan comes back to the past because he discovers a way to change the course of history for the better. He meets the past Gohan and is amazed at how innocent and less battle - hardened he is. He begins to teach him about the true power within, not just physical strength but also mental fortitude. He might also interact with the other characters like Bulma, who could help him figure out a way to permanently alter the future. This could lead to a lot of emotional moments as future Gohan reflects on his own past and tries to ensure that the new future will be different. There could be battles against enemies that future Gohan knows will be a problem in the future if not dealt with now, and he uses his experience to guide the past characters in these battles.
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