If Goku went with Raditz, it would have likely caused chaos. Maybe they would have clashed with other heroes or even joined forces with villains. The possibilities are endless!
It could have led to a completely different story arc. Maybe they would have teamed up and faced even greater challenges together.
It could have led to a much quicker victory for Goku. His SSJ2 form is way more powerful than SSJ1.
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.
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.
If Goku had his potential unlocked, it might open up a whole new set of storylines and challenges. He could face off against previously unbeatable enemies or discover hidden secrets about his powers. It would be an exciting twist for any fanfic!
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.
Goku would be a mix of angry and worried. His Saiyan blood would make him want to rush into battle with Raditz right away. But he also knows how dangerous Raditz is, so he might first try to gather some allies, like Piccolo. He'd be constantly thinking about Gohan and how to rescue him as quickly as possible.
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.
It could have led to all sorts of interesting plot twists. Maybe they would have had powerful kids or faced unique challenges together.
Bardock's power could be shown as more raw and instinctive. Since he was a pure - blooded Saiyan from a time when Saiyans were more about brute force and conquering. Raditz might have a power level that is in between Bardock and Goku. His power could be more focused on intimidation at first, but as the fanfic progresses, he could develop it further. Goku's power, on the other hand, would be more about growth and adaptability. He learns from his battles and constantly improves, so his power could be shown as evolving more rapidly than the others.
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.