His life might be more focused on his training and adventures. Without the family responsibilities of being a husband and father, he could freely travel the universe seeking stronger opponents and new challenges. He might also be more involved in protecting the entire universe rather than just his family.
If Goku never married Chi - Chi in fanfiction, his life would take a very different path. Firstly, he would be much more nomadic. He could spend all his time training under different masters across the universe or exploring uncharted planets. Secondly, his relationships with his friends like Krillin and Yamcha might be even stronger as he would have more time to be with them. Also, his power - up journey could be even more extreme. He might not have the motivation to achieve Super Saiyan levels for the sake of protecting his family, but rather for the pure love of combat and the pursuit of the ultimate power. This could lead him to take risks that he might not have taken if he were married. And without the family obligations, he could be more involved in inter - galactic politics and battles, becoming a sort of freelance protector of the universe.
Well, he would probably be constantly on the move. He wouldn't have to worry about things like providing for a family or being home for dinner. Maybe he would have formed a different kind of bond with his friends. Instead of having a family - centered life, his life would be all about self - improvement and fighting for the greater good. He could have become an even more legendary figure in the martial arts world, traveling from planet to planet, learning new techniques and spreading his name far and wide.
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.
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.
One way is that it's a very hesitant kiss. Goku, being naive about love, is unsure but Chi - Chi initiates it, and it's described as a soft, brief touch of lips. Another description could be that it's a spontaneous kiss. They are in the middle of an argument about Goku's training, and suddenly, in the heat of the moment, Goku kisses Chi - Chi to stop her from being angry. It's a bit clumsy but full of raw emotion.
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.
When Chi Chi dies, Goku is left with a void. In the fanfiction, he might initially reject the idea of new love. However, as he continues his adventures, he stumbles upon a kind - hearted being. She helps him heal from his grief. Their relationship begins slowly, with shared moments of understanding. As they get closer, Goku discovers new ways to be happy. The story could develop with them facing threats to the universe together, their love growing stronger through each trial.
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.
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.
Often, fanfiction writers will describe the setting around the kiss. It could be in a beautiful, peaceful place like their home on Mount Paozu, with the sun setting in the background. The description of the kiss itself might include details like the softness of their lips and the emotions that pass between them, like love, relief, and a sense of belonging.
It could lead to a completely different dynamic in the Dragon Ball universe. Maybe their combined parenting styles would shape Goku and Vegeta's kids in unique ways.
Chi - Chi would likely be very hurt at first. But then she would get angry and start thinking of ways to prove to Goku that their relationship is strong. She might cook his favorite meals and remind him of all the good times they've had together, while also giving Bulma a piece of her mind.