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 interesting plot could be that a time - traveling device is found. Goku uses it to go back in time to meet his father Bardock. At first, Bardock is suspicious of Goku, but as they start to communicate, Bardock realizes that Goku is his son from the future. Together, they try to change some of the events in Saiyan history, like preventing the destruction of Planet Vegeta. But they soon find out that changing the past has unforeseen consequences that put the entire universe at risk.
Perhaps in a fanfiction, Bardock's spirit is transferred into a new body, and he finally gets to meet Goku in person. They embark on a journey together to a new planet that was once home to an ancient and powerful race. On this planet, they find artifacts that can enhance their power. However, they also have to face the guardians of the planet who are protecting these artifacts. As they fight side by side, their relationship as father and son deepens.
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 interesting 'Dragon Ball Z Bardock' fanfiction could be about Bardock surviving and coming back to change the course of Saiyan history. It might explore his relationships with other Saiyans in a new light, like how he'd interact with Goku differently.
One great Bardock in Dragon Ball Z fanfiction is often depicted as a fearless and noble Saiyan. He is shown as a warrior who, despite the cruel nature of the Saiyan race at that time, had a sense of honor. In some fanfictions, he manages to break free from the control of Frieza in more creative ways than in the original story, making his character even more complex and interesting.
Well, it could be that Goku meets Bardock in a dream - like state. Bardock appears to Goku to pass on some long - lost Saiyan knowledge or a special technique. Goku, being eager to learn more about his heritage, listens intently. As they interact, Goku might feel a deep connection to his father that he never felt before. This could also lead to Goku having a new understanding of his Saiyan nature and using it to become even stronger in his future battles.
One popular plotline could be a training arc where Female Goku and Vegeta train together. They start off as rivals but gradually develop respect for each other's skills. This could lead to them teaming up against a powerful new enemy. Another plotline might involve a love triangle of sorts, where Vegeta is initially attracted to Female Goku but she is more focused on her training and protecting the Earth. Or perhaps a story where they travel to a new planet together and have to face the unique challenges there while also dealing with their complex relationship.
One possible scenario could be an emotional reunion. Bardock, having seen Goku's future through his premonition ability, might be filled with pride. He could see how Goku has grown and the hero he has become in protecting the Earth. Another scenario could be Bardock arriving at a crucial moment during a battle Goku is in and lending his Saiyan strength to help Goku out. This would not only show their Saiyan connection but also the power of family unity in the Dragon Ball Z universe.
A popular version of Bardock in fanfiction is the one who has a premonition of the destruction of the Saiyans much earlier. This Bardock then tries to take actions to prevent it, like gathering other Saiyans who might be sympathetic to his cause. It makes him a hero figure right from the start, rather than just a victim of Frieza's wrath as in the original story.
One idea could be exploring their relationship before Bardock was sent on his final mission. Maybe a story about them training together and sharing their dreams for the future of the Saiyan race.
In this fanfiction scenario, it could be an extremely emotional encounter. Goku, who has grown so much in Dragon Ball Super, finally meeting his father Bardock. Maybe Bardock gets to see how his son has not only become a powerful Saiyan but also a protector of Earth. It could lead to some interesting exchanges about Saiyan heritage and the future of the Saiyan race.
One good storyline could be Bardock and Gine's early days together. Maybe how they first met and fell in love. It could show their adventures as young Saiyans before the destruction of Planet Vegeta.