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.
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 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.
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 common theme is Marron's growth as a character. Fans often like to write about how she becomes stronger, more confident, and independent.
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.
A common theme is training. Since Goku is a master of martial arts, many fanfictions focus on him training Caulifla, like in 'Training Days'. It could be about her learning new forms or just improving her basic skills.
One common theme is power - up. The OC usually has some sort of unique power or ability that they either learn to control better or gain more of with Goku's help. For example, in many fanfictions, the OC might start with a weak power but end up becoming really strong like Goku.
The theme of legacy is quite common. Goku is a legendary figure, and in fanfiction, his legacy - what he leaves behind for future generations - is often explored. Also, the theme of redemption can be found. Maybe Goku made a mistake in the fanfiction's plot, and he has to redeem himself. And the concept of the hero's journey is also there. Goku's path as a hero, with its challenges, growth, and revelations, is a recurring theme in serious Goku fanfiction.
Love and family are very common themes. Since they are husband and wife and have a son, many fanfictions explore how they deal with family life together.
One common theme is the exploration of Goku's vulnerability. Usually, he's seen as this super - strong character, so when he's hurt, it shows a different side of him. Another theme is the bond between him and his friends and family. They often come together to help him when he's injured.