In PPG fanfics, family is also a common theme. Their relationship with the Professor, who created them, can be delved into. Maybe there are stories about how he helps them understand their powers better, or how they deal with his over - protectiveness. Additionally, there are often themes of self - discovery, where each Powerpuff Girl learns more about her own unique qualities and how to use them to the fullest.
Another theme is their superhero adventures. Fanfic writers like to create new villains or threats for the Powerpuff Girls to fight against. It can be really creative, like they might face an alien invasion or a powerful magic - based enemy. And also, the growth of the characters, like how they become better at handling their powers and responsibilities over time.
One common theme is friendship. The Powerpuff Girls' strong bond is often explored further in fanfics. For example, how they support each other through difficult times or face new challenges together.