One interesting concept could be a female Goku having a different approach to training. Maybe she focuses more on finesse and speed rather than brute strength like the male Goku. She could also have a different relationship with the other Z - fighters. For example, her interactions with Vegeta might be less combative and more of a friendly rivalry.
In some fanfictions, a female Goku might have unique power - ups. Instead of going Super Saiyan in the traditional way, she could tap into a more feminine - energy - based transformation. This could lead to new and exciting battles and storylines. Also, her backstory could be altered. Perhaps she was raised in a different way on Planet Vegeta, which influenced her personality and fighting style.
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.
Well, in Dragon Ball Z Multiverse Fanfiction, there are often concepts like different Saiyan clans. Some fanfictions explore the idea that there are more Saiyan clans out there with unique powers. Also, the idea of time - traveling in a different way than in the official story. Instead of just using the time machine, characters might use some sort of magic or new technology to travel through time and change the course of events. And of course, there can be new forms of energy or power - ups that are exclusive to these fan - made stories.
A possible plotline could be that Bardock, in the afterlife, is able to communicate with Goku in his dreams. He warns Goku about an upcoming threat that is even more powerful than the villains he has faced so far. Goku then starts a new training regime in preparation for this threat, and along the way, he discovers more about his father's past and the true potential of the Saiyan race.
One idea could be that Female Goku and Vegeta have to team up to save the universe from a new and powerful enemy. They start off not getting along well, like in the original series, but as they face challenges together, they develop a mutual respect and friendship.
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.
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.
Often, fanfictions in this area explore the concept of the gods' true nature more deeply. In the original Battle of Gods, we only got a glimpse. But in fanfiction, authors might expand on what it really means to be a god in the Dragon Ball Z universe. They could explore things like how the gods' power is maintained, their relationships with each other beyond what we saw in the movie, and how mortals can truly interact with them on a deeper level.
Well, one interesting concept could be unique character designs for the self - inserted original characters. They might have special powers or abilities that are different from the regular Dragon Ball Z characters.
Another idea is a male OC who is a master of an ancient martial art that has been lost in the Dragon Ball Z universe. He could use this martial art to defeat enemies in unexpected ways. His fighting style might focus on using the opponent's energy against them, rather than relying solely on his own power.