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 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.
In Dragon Ball Z fanfiction, Goku is like the unwavering positive force. His determination to get stronger and his uncomplicated view of right and wrong are important elements. He's the one who usually initiates the friendly rivalries and the drive to overcome challenges. Vegeta, being the Saiyan prince, brings a sense of royalty and pride. His struggle with his own identity and his relationship with Goku add depth. Fanfictions often use their characters to explore themes like redemption, friendship, and the limits of power. For example, Vegeta's journey towards accepting Goku as an equal is a common theme that shows his growth as a character.
In the fanfiction plot, Goku might be on a quest to save the universe when he stumbles upon a time - rift. Through this rift, he meets his mother. She has knowledge of an ancient Saiyan prophecy that Goku is a part of. Together, they work to figure out how to fulfill the prophecy and save the universe. Along the way, Goku gets to know his mother better, and she becomes an important figure in his life, guiding him both in battles and in his personal growth.
In a fanfiction scenario where Goku meets his mother, it could be an extremely emotional encounter. Goku, who has grown up without his mother, might feel a sense of completeness. His mother could be amazed at how strong and heroic he has become. She might share stories about his father that Goku never knew. It could also lead to Goku having a newfound sense of family and purpose, perhaps inspiring him to train even harder to protect the family he has left and the memory of his mother.
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.