One interesting storyline could be Future Trunks getting transported to the My Little Pony world. He might initially be confused by the colorful and peaceful place. Maybe he tries to find a way back home while also getting involved in the local ponies' problems, like helping them fend off some new threat that his fighting skills could be useful against.
Perhaps a fanfic could focus on a magical accident that combines the powers of the MLP universe and Future Trunks' technology. This creates a unique situation where Trunks has to figure out how to control this new power source. He might have to work with Twilight Sparkle, as she is very knowledgeable about magic. Their combined efforts could lead to a new era of peace and understanding between the two very different universes.
You need to do a lot of research. Watch Dragon Ball Z to fully grasp Future Trunks' character traits and his world. And of course, be familiar with the MLP series. When writing, focus on the character development. Let the two different sets of characters grow and change as they interact with each other. Maybe Trunks becomes more in touch with his softer side through the influence of the ponies, and the ponies become more confident in facing danger because of Trunks.
In MLP future fanfic, a great concept is the exploration of different species' co - existence. Maybe there are new races that come to Equestria, and how the ponies interact with them, like sharing resources or cultural exchanges. Also, the development of Ponyville into a more advanced town, with new buildings and technologies inspired by magic is quite fascinating.
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.
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.
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.
One interesting plot could be Future Trunks arriving in a new timeline where lemons have some sort of magical power. He has to figure out how to deal with this new element while also protecting the timeline from threats. Another plot might involve Future Trunks having an encounter with a character who is obsessed with lemons, and their strange relationship leads to various adventures. And there could be a plot where Future Trunks uses lemons as a symbol to inspire hope in a dark and desolate future, like using lemon - scented items to remind people of better times.
A crossover with the Star Wars universe would be cool. Future Trunks could find himself on a planet in the Star Wars galaxy. Maybe he has to help the Jedi fight against the Sith. His superhuman strength and ki blasts would be a new and powerful element in the Star Wars battles. He could learn about the Force while also teaching the Jedi about ki energy.
Another storyline could involve Celestia and Discord having to team up against a common enemy. Maybe an ancient evil that threatens Equestria. At first, they might struggle to work together due to their very different natures. Celestia is all about order and harmony, while Discord is chaos personified. But as they face challenges, they learn to appreciate each other's strengths and develop a unique friendship.
Perhaps a plot where Future Gohan and Future Trunks accidentally travel to an alternate timeline. There, they have to team up with different versions of themselves to defeat a common enemy. This would involve exploring how they interact with these alternate selves and how they adapt to the new environment and challenges.
Well, for a 'Future Trunks Fanfic' to be really good, it should explore his emotions deeply. Trunks has been through a lot, and showing his inner turmoil, like his guilt over not being able to save everyone in his timeline, can make the fanfic stand out. Additionally, a fanfic that adds new elements to his powers or relationships can be very appealing.