A common theme is family. Since Gine is Naruto's mother, fanfictions often explore the family bond that could have been. Another theme is legacy. They might show how Gine's legacy affects Naruto.
There are several out there. For example, 'Gine's Influence on Naruto' explores how Gine, if she were alive, could have influenced Naruto's growth and journey. It delves deep into their potential interactions and how it might have changed Naruto's path. There's also 'Naruto's Encounter with Gine's Legacy' which shows Naruto discovering and being affected by Gine's hidden past and her unfulfilled dreams.
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.
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.
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.
In this fanfiction scenario, Gine's meeting with Goku and Raditz could be filled with various emotions. Maybe Gine is overjoyed to see Goku, her long - lost son. And when it comes to Raditz, there could be a sense of family reunion despite their past differences. It could be a moment of shock and then warm acceptance as they all come to terms with their relationships.
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.
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.