Family is a common theme. Since they have a family in the Dragon Ball series, fanfictions often explore how they raise their kids. Another theme is love, of course, showing the depth of their relationship.
One common theme is the balance between Goku's warrior life and his family life with Chi - Chi. Many fanfictions will deal with how Goku tries to be a good husband and father while also being a powerful fighter. Also, the theme of Chi - Chi's support for Goku is often explored. She stands by him through all his battles and adventures, and fanfictions like to expand on this aspect of their relationship.
Well, there are several. A major one is the growth of their relationship over time. Starting from when they first met to when they are raising a family. Another is the challenges they face as a couple. For instance, Goku's constant need to fight and get stronger might cause some frictions in their relationship. Fanfictions often play around with these ideas, showing how they resolve these issues and keep their relationship strong.
There are many. One type of fanfiction could be about Goku and Chi - Chi's courtship. Maybe it details how Goku finally realized his feelings for Chi - Chi. Another aspect could be their cultural differences, since Goku grew up with a different set of values as a Saiyan. Fanfictions might explore how they overcome these differences in their relationship.
Well, perhaps Chi - Chi meets Goku at a new tournament. Goku is excited to see her, but Chi - Chi is a bit miffed that he didn't tell her he was participating. They then have a heart - to - heart talk about his love for fighting and her desire for a more stable family life. It could be a really emotional encounter with lots of reminiscing about their past and hopes for the future.
Love and family are very common themes. Their relationship as husband and wife, and as parents to Gohan and other children is often explored.
Power struggles can also be a common theme. Dark Goku is often depicted as very powerful. Chi - Chi, on the other hand, has her own strength in terms of her determination and will. The power dynamic between them can create interesting scenarios in the fanfic. There could be moments where Chi - Chi has to find ways to stand up to Dark Goku, or Dark Goku might try to use his power to manipulate or control her in some way.
Love and family are very common themes. Since they are a married couple and have a son, many fanfics explore how they navigate their relationship while also raising Gohan. For example, in some fanfics, Goku tries to be a better husband and father by spending more time at home.
They could go on a quest to find a special ingredient for a meal that Chi - Chi wants to cook. Goku, being Goku, might make the journey more exciting with his superhuman abilities and his knack for getting into trouble.
One unique aspect is the exploration of female relationships in the Dragon Ball world. Since most of the focus in the original is on the male fighters, fanfictions about Chi - Chi and Maron give a different perspective. For example, they can show how the two deal with the male - dominated environment.
There are various fanfictions that might explore Chi - Chi's death in Dragon Ball Z. Some might do it to explore how Goku and the other characters would react. In a sense, it could be a very dark and emotional take on the story, showing the grief and possible revenge motives of the characters left behind.
I haven't come across such a fanfiction myself. It goes against the general nature of their relationship in the original series. Chi - Chi loves Gohan deeply and is very protective of him.
One common theme is friendship. The oc might befriend Chi Chi and they could go through different experiences together, like helping out in the village or training. Another theme is adventure. The oc could join Chi Chi on a journey to find something, like a special ingredient for a meal or a lost artifact in the Dragon Ball world.