The main character is likely the doctor himself. He is the central figure around which the story revolves as he treats the monster girls.
The doctor is the primary character in the 'Monster Girl Doctor Novel'. However, we can expect there to be other important characters too. For example, there could be an elder or a leader among the monster girls who may interact with the doctor regarding the health of their community. There might also be a sidekick or an assistant to the doctor, either a human or a monster girl, who aids him in his medical practice and adventures in the world of monster girls.
The main character is likely the doctor himself. There may also be some important monster girl characters who are his regular patients or who play significant roles in his adventures.
Glenn is the central character in the Monster Girl Doctor light novel. He is the one with the medical knowledge and the compassion to treat monster girls. Alongside him, there are monster girl characters like the slime girl. The slime girl has her own unique characteristics and needs. And then there is the harpy girl who adds a different dynamic to the story. These characters together create a rich tapestry of relationships and events in the light novel.
Typically, the main character is the one who has been reincarnated as a monster girl. There might also be other supporting characters like friends or mentors she meets along the way. Maybe there's a wise old monster who helps her understand her new powers.
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.
A monster girl with unique powers, like the ability to control elements such as fire or water, could be a main character. She would use her powers not only to survive but also to help those around her. For example, she might use her fire - controlling ability to keep her friends warm during a cold journey or to fight off enemies that are afraid of fire. And she would have her own personality, maybe she's kind - hearted but also a bit headstrong at times.
The protagonist is often a human male who finds himself in the world of monster girls. He plays a crucial role in the story as he interacts with the different monster girl characters. Then there are various monster girl characters like the cat - girl type, who is usually agile and has a mischievous side. Another could be a dragon - girl, who is powerful and has a strong sense of pride.
The hellhound monster girl is the central figure, no doubt. But in addition to her, there could be a whole cast of characters. There may be a human character who initially fears her but then comes to understand and support her. There could be an ancient demon or spirit that has some connection to her origin or powers. And then there are the potential sidekick characters, maybe some smaller or less powerful monsters that follow her around, either out of loyalty or because they see her as a means to protect themselves in a dangerous world.
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.
Most likely the monster girls themselves are the main characters. Each with their own distinct features and personalities.
As not much is known about it, it's difficult to say. But it's likely the monster girl would be one of the main characters. There could also be other characters like local villagers or creatures from the alp area.