One common theme is the exploration of their relationship. Since they come from different 'worlds' in a sense (Trunks as a Saiyan and Android 18 as an android), their interactions can be really interesting. They might start as enemies or at least not friends and then develop a bond.
Another theme could be power. Trunks has his Saiyan powers and Android 18 has her unique android abilities. Fanfictions might focus on how they combine their powers to defeat a common foe or how they compare their powers to one another. For example, in a fight - centered story, they might test each other's limits.
One common theme is time-travel. Since Trunks is known for his time - traveling adventures, many fanfictions explore this aspect further, like dealing with the consequences of changing timelines.
The theme of heroism is quite prevalent. Mirai Trunks is a hero in his own right, and fanfictions often showcase his heroic deeds, whether it's saving the world from a new threat or just helping those in need in his own timeline. Also, the theme of self - discovery is common as he tries to figure out his place in the world and his purpose.
Well, self - discovery is also a common theme. Both Trunks and the OC learn more about themselves through their interactions. In some fanfictions, the OC discovers their true origin or purpose while being with Trunks. And of course, the theme of saving the world or universe is prevalent. They team up to fight against powerful villains and protect their world.
Well, a frequent theme is her identity as a Saiyan. Fanfictions often explore how she balances her Saiyan heritage with her life on Earth. Adventure is another big theme. She goes on all sorts of quests and battles in many fanfictions. Also, the theme of redemption can be found in some. Maybe she has to make up for a past mistake or save someone she once wronged.
A common theme is protecting loved ones. When Trunks sees his family or friends in harm's way, he gets mad and is driven to take action. Another could be revenge. If someone wrongs him or his loved ones, his anger fuels his desire for revenge in the fanfiction.
Friendship is a very common theme. Since they grew up together, many fanfictions explore how their bond as friends deepens over time.
A common theme is the adjustment to married life. They have to learn to live with each other's habits. Another theme is family. They might think about having children or dealing with their extended families.
One common theme could be the exploration of their different personalities coming together. Marron might be more gentle and Trunks more headstrong, and the fanfiction could show how they balance each other out.
Well, family is a big one. Vegeta's love for Trunks is often explored in the context of family bonds, which is different from his relationships with others. Protection is also common. Vegeta will do anything to keep Trunks safe. And there's the theme of legacy, with Vegeta wanting Trunks to carry on the Saiyan pride and power in a proper way.
One common theme is the clash of good and evil. Trunks represents the good side, and Frieza is the epitome of evil in the Dragon Ball series. Another theme could be redemption. Some stories might explore if Frieza can be redeemed through his interactions with Trunks. Also, power struggles often come up, as both characters are extremely powerful in their own ways.