There might be a brave little monster kid as the main character. This character could be curious and always ready to explore new things.
Perhaps there are a group of monster kids who are all main characters in a sense. For example, one could be the strong and silent type, another could be the joker, and they all contribute to the story in different ways. They work together to face difficulties and have adventures.
Sometimes, the main character is a human kid who gets involved with the monster kids. For instance, a lonely human child discovers the world of monster kids and becomes their friend. Together, they go on adventures in both the human and monster worlds.
The main character is Grover. Grover is very afraid of the monster at the end of the story. He tries to stop the reader from turning the pages to avoid reaching the end where the monster might be. His actions and reactions throughout the story are what drive the plot forward and make the story so interesting for kids.
I don't know the details of 'the monster story', so I can't say for sure. But it could be the monster itself as a main character, and maybe a human who crosses its path.
Perhaps the main characters are siblings. A brother and a sister who have to face some challenges together. The brother could be the more adventurous one, always getting into little troubles, while the sister is the smart one who figures out solutions. There might also be their pet dog that tags along in their adventures and plays an important role in the story.
Since I don't know the specific 'dweller monster story', it could be the monster itself as a main character. Maybe there's also a brave hero or a group of adventurers who try to face the monster.
There could be an explorer as a main character, who is the one to enter the cave and face the monster.
I'm not sure exactly who the main characters are in 'Monster Girl Story' without more information. But it's likely to have a human character as a protagonist who serves as the link between the human world and the world of monster girls.
Obviously, Charlotte and the monster are the main characters.
I'm not sure as I haven't read it, but it could be the person who is considered the'monster' in the story, along with those who are affected by this person's actions, like victims or their families.
The main characters are often the hero, who is brave and strong, and the monster, which is usually very powerful.