A third possible plot is that Goku and Chi - Chi meet in a parallel universe where their relationship is completely different. They could explore this new dynamic and learn from each other. Maybe in this universe, Chi - Chi is a powerful warrior herself, and they team up to fight a common enemy, which changes their relationship in their own universe when they return.
Maybe in this fanfiction, Goku realizes that he and Chi - Chi have very different personalities. Chi - Chi is often more concerned with family and a stable life, while Goku is a free - spirited adventurer. This clash of values could lead him to decide not to marry her. For example, Chi - Chi may want Goku to stay at home and help raise Gohan, but Goku is eager to explore new planets and fight powerful enemies.
Well, their meeting in fanfiction could be really sweet. Maybe Goku finally realizes how much Chi - Chi has been there for him all these years. He might see her in a new light, beyond just being his wife. They could have a deep conversation about their past adventures and how they've grown as individuals.
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.
Some people might create it just for shock value. They know that the original relationship between Goku and Chi - Chi is loving, so by creating something so opposite, they can get a reaction from readers.
Well, in fanfiction, Goku kissing Chi - Chi can be a way to explore different scenarios. For example, it could be a moment of reunion after Goku has been away for a long time on a tough battle or training. This kind of scenario can bring out a lot of emotions, both from the characters themselves and from the readers who are fans of their relationship.
One reason could be his pursuit of stronger opponents. Goku is always eager to test his strength and find new challenges. In fanfiction, this might lead him to leave Chi - Chi to travel the universe in search of the toughest foes. He might feel that staying at home with his family restricts his growth as a fighter.
I'm not sure if there is an actual fanfic with that exact plot. Fanfic topics can vary widely, but this seems like a rather unfaithful and out - of - character concept considering Chi Chi's strong bond with Goku in the original series.
Love and family are very common themes. Their relationship as husband and wife, and as parents to Gohan and other children is often explored.
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 reason could be to explore a completely different side of the characters. Maybe the writer wants to see how the Dragon Ball universe would react to such a scandal. Another reason might be for shock value, to get readers' attention with a very unexpected plot twist.