The doppelganger characters are likely to be among the main ones. Since it's in the title, they probably play a central role in the stories.
One interesting aspect might be the character development of the doppelgangers in these spin - off stories. They could start off as mysterious entities and gradually reveal their true natures and motives as the story progresses. For example, a doppelganger might initially be seen as a threat but then turn out to be an ally in a fight against a greater evil that threatens the monster girl world. Also, the interactions with different monster girl species can lead to all kinds of adventures. The doppelganger might learn new skills or abilities from the other monster girls, or vice versa.
Exploration is likely a theme too. They could be exploring new lands, uncovering secrets, and learning about different cultures within the spin - off stories. This gives a sense of discovery and adventure. For instance, they might find ancient ruins that hold the key to their past or a new power source that could change their world. Also, self - discovery can be a theme as the monster girls figure out their own identities and place in the world.
One interesting storyline could be about the unique relationships between the monster girls. For example, how they interact with each other in a world that's different from the main game's setting.
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.
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.
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.
Tamamo is definitely one of the main characters. There might also be other characters that are related to her story, perhaps some other monster girls that she interacts with regularly. But without more in - depth knowledge, it's hard to say exactly who all the main characters are.
I think the mermaid - like monster girls are among the most interesting. They live in a different environment, the underwater world, which is full of mystery in the context of the story. Their relationship with the surface - dwelling monster girls and how they interact with the land - based world in certain parts of the story is really fascinating. And their physical characteristics, like their fish tails and ability to breathe underwater, add a lot of charm and uniqueness to their characters. Plus, their cultural aspects related to the underwater society they belong to can also be a great source of interesting storylines.
There is the male protagonist who is often at the center of the story. He interacts with a variety of monster girls. Each monster girl has her own distinct personality. For example, there is a mermaid - like monster girl who is very gentle and kind.