If Raditz survived in fanfiction, he would likely have a complex relationship with Goku. He might start to see the value in Goku's way of life. Goku could try to reform him, and Raditz could slowly become a more positive force in the Dragon Ball Z universe.
It could be a story of redemption for Raditz. He starts off as a bit of a villain, but through interactions with Bardock (either as a memory or some kind of spirit guidance) and Goku's influence, he changes his ways. They could all be training together on Planet Vegeta before its destruction, with Bardock teaching them valuable Saiyan combat techniques and life lessons that shape them into the characters we know.
Family ties are a key element. Since they are brothers, fanfictions often explore their complex relationship, like how they deal with their Saiyan nature versus the influence of Earth. For example, in some, Goku tries to make Raditz understand the importance of protecting the planet.
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.
A possible fanfiction could focus on a group of Saiyans who are trapped in a dimension where they can only watch the Goku vs Frieza fight on repeat. They start to notice small details in the fight that they hadn't before, like the exact moment Goku's power level spikes or how Frieza is trying to adapt his strategy. This newfound knowledge could then be used by them in some way when they eventually break free from that dimension.
There might be a fanfiction where Raditz survives and teams up with Goku against a new, more powerful enemy. They have to put aside their differences and learn to work together. Raditz could start to respect Goku's strength and his way of life.
One idea could be to focus on Bardock's perspective before his fateful battle. Maybe explore his thoughts about his son Goku being sent to Earth and his own impending doom. He could have some premonitions about Goku's future role in saving the universe.
In fanfiction, when Goku meets the Saiyans, it might be a chance for him to learn more about his own race. He could discover new Saiyan techniques and powers. There could also be conflicts among the Saiyans themselves regarding Goku. Some might see him as a threat, while others might see him as a potential ally or leader.
There's 'Goku and Raditz: A New Beginning'. This fanfiction takes an interesting turn by imagining a scenario where Raditz survives his initial encounter. It shows their journey together as they try to understand Earth and its ways, with Goku teaching Raditz about the values of the planet.
You can start by looking on fanfiction websites like FanFiction.net or Archive of Our Own. These platforms have a large collection of fan - created stories, and you can search specifically for Goku and Raditz fanfiction using the search bar.