In Gine x Goku fanfics, Gine is usually characterized as a strong - willed character. She may have been through a lot in her past as a Saiyan, but she still holds onto her values. Writers might show her as a source of comfort for Goku, someone he can turn to when he has doubts about his Saiyan identity. Also, she could be presented as a character with a lot of untapped power. Since we didn't see much of her in the original series, fanfic writers can explore her potential strength and how she uses it to help Goku.
One great 'Bardock x Gine fanfic' could be 'The Unlikely Bond'. It beautifully weaves a story of how Bardock and Gine's relationship might have developed. Another one is 'Destiny's Meeting' which focuses on their first encounter and how it sets the stage for their relationship in a really interesting way. There's also 'Love Across Galaxies' which is more of an epic take on their relationship, showing how their love endures through various challenges across different parts of the universe.
One common theme is forbidden love. Since Saiyan society has its own rules and hierarchies, their relationship might be seen as going against the norm. Another theme is the power of love in a harsh world. Saiyans are known for their strength and battle - oriented nature, but these fanfics often show how love between Bardock and Gine can be a powerful force even in such a world. Also, there's the theme of sacrifice, like one of them might have to sacrifice something for the sake of their relationship or for the other's well - being.
One popular plot theme could be an alternate universe where Gine didn't die and gets to interact more with Goku as he grows up. This could involve her teaching him about their Saiyan heritage in a more detailed way than he learned on his own. Another theme might be a romantic relationship between them, which is a very different take on the Dragon Ball universe's relationships. And a third could be Gine coming back to life and joining Goku in his battles against powerful foes, adding a mother - son dynamic to the fight scenes.
A possible plot could involve Goku and Gine meeting in a parallel universe where the normal rules don't quite apply. They start off as strangers but quickly realize they have a lot in common. Their relationship could develop as they train together, learning from each other's fighting styles. Gine might introduce Goku to some unique Saiyan traditions that have been long forgotten, and together they become a powerful duo in this new universe.
Goku is often paired with Gine in fanfiction, as their mother - son relationship can be explored in different ways. Bardock is also a common pairing since he was her husband in the original lore.
With Gine, her character can be developed by exploring her feelings towards Goku. She could be shown as a loving and proud mother, but also with a sense of sadness for all the years she missed with him. Her interactions with Goku could bring out her more maternal instincts, and she might start to see Goku as a symbol of hope for the Saiyan race.
There's also a possibility that the king is a time - traveling character. He could be from the future of the Naruto world, where things have gone wrong. He discovers a way to travel to the X - Men universe and starts consuming elements from both worlds in an attempt to rewrite history and become a powerful and benevolent king who can correct the mistakes of his own world.
The plot might involve the king being from a dimension where he discovers these two fictional worlds. He starts eating things that are symbolic of the X - Men and Naruto. It could be like he eats a scroll that contains the essence of Naruto's jutsus and then a device that holds the genetic code of the X - Men mutants. This gives him abilities that are a mix of both universes, and he has to deal with the consequences of having such powerful and conflicting powers.
By showing Gine as a protective figure in Baby Goku's life. For example, she could save him from a minor danger, like a small wild animal attack. This would make Baby Goku look up to her more and strengthen their relationship.