Maybe an older wizard who has been studying monster girls for years could be the main character. He discovers a prophecy that involves a monster girl and a great danger to the wizarding world. He then recruits some young and brave students to help him on the quest. This way, it combines the wisdom of an experienced wizard with the fresh ideas and energy of the younger generation.
A group of students from different houses could be the main characters. For example, a Gryffindor boy who is curious about the mystery of monster girls, a Ravenclaw girl who has extensive knowledge about the Forbidden Forest where some monster girls are rumored to live, and a Hufflepuff boy who is always ready to stand up for the underdog, which in this case are the monster girls. They join forces on a quest that changes their view of the wizarding world.
Harry Potter himself could be the main character. He has a history of taking on difficult quests and helping those in need. His sense of justice would drive him to help the monster girls on their journey. He could use his skills in Defense Against the Dark Arts and his knowledge of the wizarding world to overcome obstacles.
It could be Vilgax. He might see the chaos caused by the monster girl transformations as an opportunity to finally defeat Ben. He could try to use the monster girls' new powers against Ben or even find a way to control them to do his bidding.
The main character is a male protagonist. And of course, there are various monster girls which can be considered as main characters in their own right as they play significant roles in the story.
Luka is often an interesting character in fanfics. His journey and growth throughout the original story make him a great focal point. Monster girls like Alice are also popular. Her unique abilities and her relationship with Luka can be explored in many ways in fanfics.
Lamia is often a popular character. Her snake - like lower body and alluring appearance make her stand out. She might be portrayed as a seductive yet intelligent character in the fanfic.
The main character is usually a male protagonist who embarks on the journey in the world of monster girls. There are also various monster girl characters, such as the lamia, harpy, and slime girl, who play important roles in the story, either as allies or antagonists depending on the situation.
In the 'Monster Girl Quest Hellhound Story', the hellhound is surely a main character. It may be accompanied by a group of diverse monster girls. There could be a harpy who provides aerial support or scouting. A slime girl might also be part of the story, adding an interesting dynamic with her unique abilities. Additionally, there could be a mermaid - like monster girl if the story has elements that involve water or underwater regions. These characters, along with the hellhound, would likely drive the plot forward through their interactions and individual story arcs.
Some of the main characters are the various monster girls. Each type of monster girl, like the lamia or the harpy, can be a central character in different side stories. They bring their own personalities and traits to the story.
One idea could be a quest where the main character has to rescue a monster girl who is being wrongly persecuted in the wizarding world. Maybe she has a unique power that the dark wizards want to use for evil, and the protagonist, inspired by Harry Potter's courage, sets out to protect her.
There could be other original characters in the fanfic as well. Maybe there's a mysterious teacher who has a deep understanding of the Sorting Hat's magic. This teacher could help the girl unlock the secrets of the Sorting Hat and her own potential. And then there could be a rival student, perhaps from a different house, who challenges the girl at every step. Their interactions could drive the story forward and add conflict and drama to the plot.