One idea could be exploring the Supreme Kai of Time's untold backstories. Maybe she had some secret training or a special encounter in the past that shaped her into the being she is in the DBZ universe.
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.
Raditz could be redeemed by sacrificing himself for the greater good. For example, if there was a powerful enemy threatening the Earth and he steps in to take a fatal blow meant for someone else, like Gohan or Goku.
A good Raditz story should focus on his Saiyan heritage. For example, showing how his Saiyan instincts play out in different situations, like when he's facing a tough enemy or making a decision about whether to show mercy or not.
Well, Raditz was part of a Saiyan group. One day, he got separated from his team during a battle on an alien planet. He had to fend for himself. Raditz found a small cave and used his Saiyan survival skills. He managed to hunt for strange alien creatures to eat. While in the cave, he also discovered an ancient power - up crystal. After using it, he became stronger and was able to find his way back to his group.
I think 'Raditz Cell Games Fanfic' is quite interesting. It might explore the story from Raditz's perspective during the Cell Games. It could include his thoughts on the powerful fighters, his own role in the events, and how he views the whole Cell Games scenario. Maybe it also has some unique interpretations of the power dynamics and character relationships in the 'Dragon Ball' universe during that time.
If Raditz turned good, it might have led to more complex character dynamics and interesting plot developments. He could have learned from his mistakes and become a valuable ally.