One possible plot could be that Mereoleona, being from her own universe with her unique set of powers, somehow gets transported to Goku's universe. Goku, being the friendly Saiyan he is, would be curious about her powers. They might start with a friendly sparring session where Goku is amazed by Mereoleona's ability to control and manipulate fire. Then, they could team up against a common enemy that threatens both of their universes, learning from each other's fighting styles along the way.
The plot could involve Mereoleona on a quest in her own world when she accidentally crosses paths with Goku who is on a similar quest in his universe. They initially misunderstand each other's motives. However, as they communicate (maybe with some help from Bulma or other characters who can translate), they find out they have a common goal of protecting their respective worlds from a powerful evil. So they join forces, with Mereoleona's tough leadership skills and Goku's raw power combining to take on the bad guys.
One possible plot could be that Goku, having achieved new levels of power, somehow travels back in time to meet Bardock. Bardock, initially shocked, quickly realizes this is his son. They could have a sparring session where Bardock sees the full extent of Goku's power and is proud. Then they might sit and talk about Goku's life on Earth, and Bardock could share some of his own past battles and the reasons he sent Goku away.
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.
Mereoleona's fire - based powers and Goku's ki - based powers could create some really interesting interactions. For example, Mereoleona could use her fire to surround Goku, but Goku could use his ki to either dissipate the fire or even absorb some of its energy to power up his own attacks. Their powers might also clash in a way that creates new types of energy blasts that neither of them expected.
One possible plot could be that when Goku and Goku Black fuse, they create a being with an incredibly powerful mix of Goku's pure heart and Goku Black's dark power. This new being might initially struggle with the conflicting natures within. They could then face an even greater threat than before, like a new, super - powerful villain that neither Goku nor Goku Black could have defeated alone. As the fused being, they have to learn to control their power and find a balance between good and evil within themselves to defeat this new enemy.
Well, it could be about Goku Jr learning some of Goku's most powerful moves. Maybe Goku teaches him the Kamehameha. They might also go on an adventure together, like fighting a new and powerful enemy that neither could face alone.
The plot could involve Goku and Goku Black fusing accidentally. Maybe due to some strange energy anomaly. And then they have to figure out how to control this new form. They might initially be feared by their friends because of Goku Black's reputation, but then they prove that they are on the side of good by using their new powers to protect the Earth from an impending threat that no one else could handle.
Well, perhaps in this fanfiction, Goku Black makes a fatal mistake. He could underestimate Goku's ability to adapt during battle. Goku, being the experienced fighter he is, notices this weakness and uses it against Goku Black. He might use a combination of his signature moves like the Kamehameha in a new and unexpected way that catches Goku Black off - guard, leading to his defeat.
Perhaps the plot involves Naruto being teleported to Goku's universe where he meets Female Goku. She's intrigued by his ninja skills and he's amazed by her superhuman strength. They end up training together. Female Goku helps Naruto understand how to control and use energy in a different way than chakra, and Naruto shows Female Goku some of his stealth and strategic combat techniques. Their friendship grows as they both strive to become stronger in their own ways.
Well, their meeting in fanfiction could be really sweet. Maybe Goku finally realizes how much Chi - Chi has been there for him all these years. He might see her in a new light, beyond just being his wife. They could have a deep conversation about their past adventures and how they've grown as individuals.
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.