The Professor is another character that often appears in fanfiction. Writers might explore his backstory more, or they could create scenarios where the Professor has to make difficult decisions regarding the girls' powers or safety. His role as the girls' creator gives a lot of room for interesting plot developments.
Obviously, Blossom, Bubbles, and Buttercup are the most popular. They are the main characters after all. But villains like Mojo Jojo are also often included as they provide great conflict. Also, the Professor who created the Powerpuff Girls can be an important character in fanfiction, especially if it involves the origin story or some kind of scientific experiment gone wrong.
Professor Utonium is a popular character to include. He is the creator of the Powerpuff Girls and his relationship with them can be explored in different ways in fanfiction. Maybe he creates a new experiment that has unexpected consequences for the girls. Another popular character could be the Rowdyruff Boys as they can create interesting rivalries and storylines with the Powerpuff Girls.
Blossom Z is often very popular. Her leadership skills and strong powers make her a central figure in many stories. Writers like to explore how she makes decisions in difficult situations.
In some fanfictions, there might be a story where the Powerpuff Girls have to deal with a personal conflict among themselves. Like Blossom might start feeling left out because Bubbles and Buttercup are getting closer. This internal struggle could then affect their ability to fight crime as a team. They would have to work through their relationship issues to be able to function as the city's protectors again.
Obviously, Blossom, Bubbles, and Buttercup are very popular. They are the main characters after all. But Professor Utonium also has his fans in fanfiction. Writers often explore his backstory more deeply or create scenarios where he has to step in and save the day when the Powerpuff Girls are in a tough spot. Another popular character is Mojo Jojo. His evil schemes and his relationship with the Powerpuff Girls can be explored in many interesting ways.
The Powerpuff Girls themselves, Blossom, Bubbles, and Buttercup, are usually very popular. Their cute yet powerful personas make them stand out. Also, Superman from the Justice League is often a fan favorite in these crossovers. His super strength and all - around good - guy image blend well with the Powerpuff Girls' world.
Buttercup is a favorite for many in Powerpuff Girls D fanfiction. Her tomboyish and tough - as - nails attitude provides a lot of material. You can write about her rivalries with other characters, or how she overcomes challenges that require her physical strength. Also, Mojo Jojo is a popular villain to write about. His evil plans and his comical attempts to defeat the Powerpuff Girls can make for some really fun stories.
The Powerpuff Girls Z themselves - Blossom, Bubbles, and Buttercup are often very popular. Fans love to write about their different personalities and how they interact with each other. For example, Blossom's leadership, Bubbles' kindness, and Buttercup's tough - girl attitude. Also, the villains like Mojo Jojo can be popular. His devious plans and his rivalry with the girls make for interesting stories in fanfic.
One popular story could be about the Powerpuff Girls and the Rowdyruff Boys having to team up against a new, more powerful villain. In this fanfiction, they start off as enemies but gradually learn to respect each other's powers and work together.
Tickle fanfiction about The Powerpuff Girls can be really creative. It might involve scenarios where the Powerpuff Girls are in a ticklish situation, perhaps during a battle with a villain who discovers their ticklish spots and uses it to try and gain an advantage. However, it's important to note that this kind of fanfiction is more on the light - hearted and fun side of the fandom.