Obviously, Naruto would be one of the main characters. And from Monster Musume, characters like Miia could be important. Miia is one of the more prominent characters in Monster Musume, and her relationship with Naruto could be explored. Maybe she could be like a mentor or a friend to him, helping him understand the Monster Musume world better.
Naruto is the main character as it's about him being the son of Monster Musume. Among the Monster Musume characters, Suu could play a significant role. Suu has the ability to change shape and absorb things. Her interactions with Naruto could be really fascinating, like she could absorb some of Naruto's chakra and it could have unexpected effects. There could also be other minor Monster Musume characters that Naruto would interact with during his adventures in that world.
Naruto would be the central character for sure. Then there could be Papi from Monster Musume. Papi is known for her carefree nature. Her interaction with Naruto could add some comical elements to the fanfiction. Also, there could be a character like Centorea who might see Naruto as a new and different kind of being and have some interesting exchanges with him regarding honor and duty.
Well, it could be about Naruto having to adapt to the unique world of Monster Musume. Maybe he discovers some new powers related to the Monster Musume world. For example, he might learn to communicate with the different monster species in ways he couldn't before. He could also form alliances with some of the Monster Musume characters to face common enemies from both the Naruto universe and the Monster Musume world.
Since it's a 'monster musume graphic novel', there are likely to be monster musume characters as main characters. These could be different types of monster girls like a lamia, a harpy or a slime girl. There might also be a human character who gets involved with their world and becomes one of the main characters in the story, through which we can see the interactions and developments among them.
As I don't know the exact details of the story, it's difficult to say for sure who the main characters are. But it's likely that the minotaur would be one of the main characters. There might also be other monsters or humans that play important roles in the story, perhaps friends or foes of the minotaur.
Since I don't have specific information about this particular 'Monster Musume Inflation Story', in the general Monster Musume series, there are characters like Miia, a lamia. But for this specific inflation story, it's hard to tell who the main characters are without more details.
The main character is often an ordinary human who finds himself in extraordinary situations due to his interactions with the monster musume. Among the monster musume, there could be a slime girl who is very curious and friendly, a mermaid - like creature who is a bit shy but has a kind heart. There may also be a werewolf - type character who is strong - willed and protective. These different characters play important roles in the story, driving the plot forward with their relationships with the human main character.
The main characters in the 'Monster Musume no Oishasan' light novel would include the protagonist, who might be in a position of providing care or assistance. Among the monster girls, there could be one that is the leader or spokesperson of sorts for the group. Another could be the one who causes the most trouble at first but later becomes an important part of the story. There may be a shy monster girl who slowly opens up as the story progresses. But again, this is all speculation without a full read of the novel.
Smith Lemon is surely a main character. Then, depending on the fanfic's focus, it could be a mermaid - like monster musume. She could bring a sense of mystery as she is from the underwater world. There might also be a centaur - type character who is strong and has a noble personality. All of these characters, along with Smith Lemon, would play important roles in the story, each with their own goals and personalities that collide and interact.
Kakashi could also be a character involved in interactions. His calm and observant nature would make him a good mediator between the two groups. He might be interested in learning about the monster musume's abilities and how they could potentially be used in the ninja world. Rock Lee might also be a candidate. His enthusiasm and determination could be an interesting contrast to the monster musume, and he could potentially learn new fighting styles from them or teach them his own.
Interaction can also happen in a more peaceful way. A Monster Musume who is good at cooking could share her recipes with Naruto and his friends. This would lead to cultural exchange as Naruto and his pals introduce her to ninja food. And they could exchange stories about their respective worlds over a meal.
I'm not entirely sure as I haven't read every bit of it, but likely there are some key monster girl characters and maybe a human protagonist.