There may be some out - there, but it's not a positive or common theme. Goku is typically portrayed as a hero and a loving family man in the Dragon Ball universe. Chi - Chi is his strong - willed wife. The idea of abuse in their relationship is a very uncharacteristic and rather disturbing concept that doesn't align with the essence of the story.
I don't support the idea of 'Goku abuses Chi - Chi' in fanfiction. Goku and Chi - Chi are a couple in the Dragon Ball series, and their relationship is based on love and family. Creating such abusive fanfiction goes against the positive image of their relationship in the original work.
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.
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.
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.
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.
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.
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.
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.
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.
Chi - Chi might also be heartbroken. She loves Goku deeply despite his flaws. In fanfiction, she may initially be in denial, thinking that Goku will come back soon. But as time passes, she realizes that he may not return, and this could lead to a deep sense of sadness and loneliness. She has to then figure out how to raise their children on her own.
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.