The Professor could play a bigger role. He could be like a Merlin - like figure, guiding the Powerpuff Girls with his scientific knowledge that has a touch of magic to it. For example, he could create new gadgets for them that are based on ancient artifacts or spells from old books he has studied.
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.
One idea could be an allusion to classic fairy tales. For example, the Powerpuff Girls could be in a situation like Cinderella. Blossom could be the hard - working one, trying to clean up the mess in Townsville while her sisters are off having fun, just like Cinderella did the chores while her stepsisters partied. Then, a magical event happens, like a powerful villain shows up and only her kindness and smarts can save the day, similar to how Cinderella's kindness was rewarded in the end.
Bubbles is a key character. She has her blonde pigtails and her superpowers. Boomer is also crucial. He has his own set of characteristics that contrast with Bubbles'. In many fanfictions, they are the focus as their relationship is explored, whether it's a friendship that forms unexpectedly or a more complex relationship that develops over time. Other characters from the Powerpuff Girls and Rowdyruff Boys universes may also appear to support or complicate their story, but Bubbles and Boomer are the main attractions.
Well, obviously the main characters would be the Powerpuff Girls - Blossom, Bubbles, and Buttercup. And Sonic the Hedgehog would also be a central character. There could also be other characters from both universes like Professor Utonium from the Powerpuff Girls side and Tails or Knuckles from Sonic's side depending on the direction of the fanfic.
In the powerpuff girls blossom story, Blossom is the central figure. However, other significant characters include her two sisters. Bubbles, who is sweet and has the power of sonic scream among others, and Buttercup, the tough and feisty one. Additionally, Professor Utonium, their creator, also plays a role in the story. And then there are the villains. Mojo Jojo is a recurring bad guy, always trying to outwit the Powerpuff Girls. There are also other villains like Fuzzy Lumpkins who add to the challenges that Blossom and her sisters have to face.
Another character that might be considered important in some of the stories could be Mojo Jojo. He's always trying to cause trouble for the Powerpuff Girls. His evil plans and his rivalry with the girls often drive the plot forward in many of the Lemon Stories.
Since it's not a mainstream story, it's difficult to say for sure. But I would assume the main characters would be at least one lycan character and the Powerpuff Girls - Blossom, Bubbles, and Buttercup.
In the 'powerpuff girls real story', there are several important characters. Firstly, we have Blossom, who is intelligent and often takes charge in their battles against villains. Then there's Bubbles, who is gentle and has a love for animals. Buttercup, being the toughest of the three, is always ready for a fight. And of course, Professor Utonium, the scientist who created them. He plays an important role in their lives, guiding them at times and being there when they need his scientific knowledge. There are also villains like Mojo Jojo and Him who are constantly causing trouble in Townsville, which gives the Powerpuff Girls their purpose of fighting crime.
Obviously, the main characters are the Powerpuff Girls themselves - Blossom, Bubbles, and Buttercup. They are the central focus as they are the ones usually getting tickled or doing the tickling in the fanfiction. Sometimes, villains like Mojo Jojo or Him might also be involved, either as the instigators of the tickle situations or as unexpected victims.