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.
A new adventure could be that they travel back in time together. They end up in the era when Goku first arrived on Earth. Chi - Chi gets to see a younger Goku and all the events that shaped him. They might even try to change some things for the better, like preventing some of the early threats to Earth. This would be a really unique adventure as they are not only exploring a different time but also seeing their own pasts from a new perspective.
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.
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, 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.
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.
Goku would likely be extremely excited. He has always had a longing to know more about his Saiyan heritage and his father. Meeting Bardock would be like a dream come true for him. He'd probably ask a million questions about his past and Saiyan culture. Chi - Chi, on the other hand, would be a bit more reserved at first. She'd be polite but also a bit cautious, as she doesn't know what this Saiyan from Goku's past might be like. But as she sees Goku's joy, she'd warm up to Bardock.
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.
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, it could be really interesting. Maybe Goku would find someone who challenges him in a different way than Chi Chi did. This new love could be a powerful fighter from another planet, and they bond over their shared love for battle and protecting the universe. It would be a big change for Goku, as his relationship with Chi Chi was more about family and domestic life in some ways.
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.
One reason could be a new, extremely powerful villain who targets Earth and Chi - Chi unfortunately gets in the way. Maybe this villain has a vendetta against Goku and decides to hurt him by killing his wife.