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.
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.
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 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.
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.
One popular pairing could be Blossom from Powerpuff Girls Z and Ruby from RWBY. Their leadership qualities might draw them together, and they could be seen as a powerful duo in combat situations, with Blossom's intelligence and Ruby's speed and scythe - wielding skills complementing each other.
Butch from the Rowdyruff Boys is also quite popular. His wild and impulsive nature can lead to a lot of action - packed and humorous situations in fanfic. Writers can explore his growth from a troublemaker to someone with a bit more depth.
The Powerpuff Girls Z Blossom, Bubbles, and Buttercup are often popular. Their unique personalities and powers make for great storylines. Blossom's intelligence, Bubbles' sweetness, and Buttercup's toughness can be explored in different ways.