Perhaps the fanfic is centered around a misunderstanding. Future Trunks, coming from a future full of destruction, might be overly cautious around Android 18, thinking she could turn back to her old villainous ways at any moment. Android 18, on the other hand, might misinterpret his wariness as an act of aggression. This leads to a series of confrontations that gradually turn into a more in - depth exploration of their characters as they try to clear up the misunderstanding.
One possible plot could be a battle of ideologies. Android 18, being a former villain turned anti - hero, might have different views on protecting the world compared to Future Trunks. Maybe Android 18 is more focused on self - preservation and the well - being of her small circle, while Future Trunks is all about saving the entire world from future threats. Their clash could lead to an epic physical fight where they test each other's limits.
In the fanfic, it could be about a power struggle. Android 18 is extremely powerful, and Future Trunks has his own set of skills. They might start competing to see who is stronger in different scenarios. For example, in a fight against a new common enemy, they initially try to outdo each other instead of working together, which causes chaos and puts the world in more danger.
Perhaps it's a story of love and redemption. Future Trunks, with his tragic past, might find solace and a new purpose in life through his relationship with Android 18. She, on the other hand, could be softened by his kindness and start to see the world in a different light.
Android 18. She has incredible strength and durability. Her android body gives her an edge in a physical fight. She can take a lot of damage and keep on fighting. Future Trunks is strong, but Android 18's power is on a different level.
One possible theme is friendship. Despite their different origins - Future Trunks being a Saiyan from the future and Android 18 being an android created by Dr. Gero - they could develop a deep friendship. This friendship might be based on mutual respect for each other's strength and abilities.
Well, it could be about Android 18's adventures in a new world created in the fanfic. Maybe she teams up with some other characters to fight a new threat.
One possible plot idea could be that Naruto, in his world, somehow discovers the story of Future Trunks. He might be inspired by Trunks' courage in facing powerful foes alone. Naruto could start training in a new way, emulating Trunks' fighting style. For example, he might focus more on sword - based attacks in addition to his ninjutsu.
A frequent theme is also friendship. Given their different backgrounds - Android 17 being an android and Trunks being a half - Saiyan - exploring how they become friends and trust each other can be really interesting. Some fanfics also touch on the theme of sacrifice, where one of them might be put in a situation where they have to sacrifice themselves for the other or for the greater good in the Dragon Ball universe.
One idea could be a crossover with the Dragon Ball Super universe where Future Trunks teams up with Goku Black from an alternate timeline. They could be forced to work together against a new, powerful enemy that threatens both their timelines. Another plot could involve a crossover with the Naruto universe. Future Trunks could end up in the Hidden Leaf Village and learn about chakra. He might then combine his ki powers with some ninja techniques to fight a common foe. A third idea is a crossover with the One Piece world. Future Trunks could land on the Grand Line and join forces with the Straw Hat Pirates. They would have to face off against the Marines and other pirates while also trying to find a way for Trunks to get back to his own world.
Well, there's a fanfic called 'Trunks' Time - Travel Tales' that's really good. It plays around with the concept of Trunks' time - traveling in a very creative way. Then there's 'Future Trunks' Love Story' which, as the name suggests, focuses on his romantic relationships. Also, 'The Legend of Future Trunks' is a must - read as it expands on his character and his place in the Dragon Ball universe.
She can be quite independent. In fanfic, female Future Trunks is usually shown as someone who can make her own decisions and follow through with them. She doesn't rely on others easily and is confident in her abilities. She might go on solo missions to save the day, which shows her self - reliance. Moreover, she may also possess a unique sense of style that sets her apart from other characters in the Dragon Ball universe, which adds to her charm in the fanfic world.
A possible plot could be that Android 18 and Goku are thrown into an alternate dimension where they have to rely on each other to survive. In this dimension, they face challenges that test their friendship and fighting skills. Android 18 might learn some of Goku's signature moves and Goku could learn more about the technology within Android 18.