In this fanfiction scenario, Goku meeting Gine could be really interesting. Gine is Goku's mother, and in a fan - made story, their meeting might involve Gine finally seeing how strong her son has become. Maybe she'd be proud of all his achievements in protecting the Earth and the universe. It could also be a very emotional encounter as Goku has grown up without her presence for most of his life.
A fanfiction might explore the idea of Bardock seeing Goku's life through a time - space rift. He witnesses all of Goku's battles and the friends he makes. Bardock is filled with pride but also realizes that Goku has a different path than the traditional Saiyan way. This makes him question the Saiyan culture he once knew. Meanwhile, Goku starts to have strange dreams about his father, which leads him to search for more about his Saiyan heritage.
One possible fanfiction could be where Goku is faced with an otherworldly entity that he can't sense or understand. This makes him scared as his usual confidence in his power is shaken. Maybe it's a being from a different dimension that defies all the rules he knows about fighting.
One great fanfiction is 'Goku and Goten's Training Days'. It focuses on Goku teaching Goten new techniques. It's really exciting as it shows their father - son bond through the training sessions.
One great 'Dragon Ball Z Gine and Goku Fanfiction' is 'Gine's Return'. It explores what would happen if Gine came back into Goku's life. It has some really interesting character interactions and a great plot that stays true to the spirit of Dragon Ball Z.
One possible change is his power level. Fanfictions often give Goku new power - ups that are even more extreme than in the official story. For example, he could gain a 'Ultra - Ultra Saiyan' form that is many times stronger than the regular Super Saiyan forms. His appearance in this form could be very different, with longer hair, more defined muscles, and a new color to his aura. Another change could be in his family life. Maybe he spends more time with his family, teaching his sons and daughter new fighting techniques that he created himself. This would show a more domestic side of Goku that we don't see as much in the original series.
Well, in fanfiction about Goku's changes in Dragon Ball Z, his physical changes can be really interesting. He might have some unique markings on his body as part of a new transformation. Some fanfictions also play around with his age - like making him age more slowly or even reverse - age in some cases. His fighting style could also change. Instead of relying solely on brute strength, he could start using more strategic moves, inspired by his opponents or his newfound understanding of the universe's power dynamics. And his relationship with the Dragon Balls themselves could change. He might discover new abilities related to them, like being able to communicate with the dragons on a deeper level.
In some fanfictions, Goku's death might be a sacrifice to save the universe. He could be facing an enemy so powerful that the only way to stop it is by giving up his own life. This would be a very emotional moment for his friends and family, like Chi - Chi and Gohan.
In this fanfiction, they might have an epic sparring session. Adult Goku could teach Kid Goku some new techniques, like the Instant Transmission. It would be amazing to see how Kid Goku reacts to Goku's Super Saiyan forms.