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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.
There's also 'Love Beyond Worlds' which could be a great Trunks and Marron fanfiction. It might involve some time - traveling or alternate universe elements. Maybe Trunks from the future accidentally lands in a timeline where he meets Marron in a completely different way than he ever expected, and they gradually fall in love as they face various challenges together.
Well, a frequently seen theme is the exploration of uncharted power levels. Given Goku's obsession with getting stronger, fanfic writers might create scenarios where Marron also gets involved in his power - up quests. Also, there's the theme of forbidden love in some cases. Goku is married in the original series, so a relationship with Marron would be considered taboo, which some writers like to explore in their stories. They often use this to create drama and tension in the plot.
A common theme could be growth. Marron might be shown growing up under the influence of Android 18. For example, Android 18 could inspire Marron to be more confident and assertive.
In Goten and Marron lemon fanfiction, a prevalent theme is the exploration of their physical attraction. Given the nature of lemon fanfiction, it delves into more sensual aspects of their relationship. There could also be themes related to power dynamics, especially considering Goten's Saiyan heritage and Marron's different upbringing. Additionally, some fanfictions might focus on the challenges they face in keeping their relationship a secret from their friends and families, adding an element of drama and tension to the story.
One great Android 18, Krillin and Marron fanfic could be one that focuses on their family outings. For example, it might show Krillin taking Android 18 and Marron to a picnic by the lake. They could have cute interactions like Marron trying to feed the ducks while Android 18 watches protectively and Krillin just enjoys the moment with his family. Another could be a fanfic where they face a new threat in their city and they all work together to overcome it, with Android 18 using her strength, Krillin his martial arts skills, and Marron showing her cleverness in some way.
There is definitely some. However, the quality can vary greatly. Some might focus on their adventures together in a new setting, perhaps in a world where they have to team up against a new and powerful enemy. Others could be more about their relationship development, like how they first meet and gradually fall in love. You really have to dig through to find the ones that suit your taste.
One interesting storyline could be Goten and Marron teaming up for a martial arts tournament. They could face various challenges together, like tough opponents and strange tournament rules. This would show their growth as fighters and also their friendship.