She could be kidnapped by an enemy who wants to use her as leverage against Gohan and the other Z - fighters. This would lead to a rescue mission where the Z - fighters have to face new and powerful foes. For instance, the kidnappers might be from a far - off planet that has a grudge against the Saiyans.
In a fanfiction, Gohan's sister could start a school for martial arts on Earth. She wants to pass on the knowledge she has learned from her family. But she faces challenges like getting students, dealing with rival martial arts schools, and also protecting the school from villains who want to disrupt it. This would show a different side of the Dragon Ball Z universe, focusing on the growth and development of martial arts on Earth from a new perspective.
Perhaps Gohan's sister has a prophetic dream about a great danger coming to Earth. But no one believes her at first. She then has to find a way to convince Gohan and the others that her dream is real. As she tries to prove herself, she discovers more about her own latent powers that are related to her prophetic abilities.
One idea could be Gohan and Lime teaming up to face a new and powerful enemy that neither of them could defeat alone. They could train together, with Gohan teaching Lime some of his Saiyan techniques.
One idea could be Future Gohan training a new generation of fighters in a post - apocalyptic world. He could pass on his skills and knowledge, creating a new hope for the future. Another plot could involve him finding a way to travel back in time to prevent the events that led to his world's destruction. Maybe he discovers a hidden power within himself that he didn't know he had and uses it to fight against the remaining threats in his world.
Perhaps a story where Gohan and Videl have to team up to protect their family from a new and powerful threat that is specifically targeting them. They would have to use their combined skills and the power of their relationship to overcome it. In this fanfiction, we could see how their love for each other and their family gives them the strength to fight.
One idea could be Gohan crossing over into the Naruto universe. He could team up with Naruto and use his Saiyan powers to fight against the Akatsuki. Another plot could be Gohan in the Harry Potter world, using his ki to defend Hogwarts from Voldemort. Or perhaps Gohan in the DC universe, fighting alongside Superman against a common enemy.
One possible fanfiction idea could be that Gohan's sister discovers she has a unique power that no one else in the family has. Maybe she can communicate with animals in a way that helps the Z - fighters. For example, she could get information from the animals about the whereabouts of the next big threat to Earth.
One idea could be that Gohan discovers an ancient animal with special powers. Maybe it's a mystical deer that can enhance his ki when he's near it. Another plot could involve Gohan turning into an animal himself, like a powerful eagle, and having to learn to control his new form and its abilities. Or perhaps he befriends a group of talking animals who help him in a battle against a new enemy.
Another interesting plot could be that the gamer aspect brings in virtual reality elements. The Z - fighters enter a virtual world where they have to fight enemies with different rules. This virtual world could have power - ups and obstacles that are based on video game concepts, like finding hidden keys to unlock new areas or defeating bosses to gain special abilities that they can then use in the real Dragon Ball Z world.
One idea could be a crossover with the Naruto universe. Goku and Naruto could team up to fight a common enemy. Maybe they face an evil villain who has the power - stealing abilities like Cell and the ability to use powerful ninja jutsus. Another plot could be a crossover with One Piece, where Luffy and Goku have a friendly competition about who can eat more food and then end up having to work together to defeat a new threat at sea that has the strength of Saiyans and the deviousness of pirates.
Perhaps a fanfiction where a young Saiyan from a destroyed planet manages to find their way to the Xenoverse 2 world. This Saiyan has a different fighting style compared to the ones we know. They join the Time Patrol not just to save timelines but also to find a new home for their kind. Along the way, they face discrimination from some of the other races in the Xenoverse due to their Saiyan heritage, but they prove themselves worthy through their strength and determination.
One idea could be Gohan struggling to control the new power of the Super Saiyan God. He might accidentally cause some destruction while training and then have to deal with the guilt and the fear of his power getting out of control.