Without having read the book precisely, we can only speculate. There could be a character who is on a quest to find out more about their identity. This character might be joined by a friend or a mentor figure. The friend could be someone who is also an outcast in some way, and together they face the challenges that come with being different, which is likely a big part of the story considering the rather unusual title.
I'm not entirely sure as I haven't read the novel in full, but typically main characters are those who drive the story forward. Maybe there is a young protagonist who is at the center of the self - discovery journey.
Marlen and Lee are the main characters. They are the ones with the 'eating' condition and their relationship is central to the story.
Maybe there is a reclusive old hermit - like figure who has some connection to the house of bones. This character could have been living near the house for a long time and has some deep - seated knowledge about the origin of the bones and the secrets of the house. They could initially be reluctant to share their knowledge but eventually be persuaded to help the other characters.
I'm not sure as I haven't read the'red bones novel' specifically. But usually in a novel, the main characters are those who drive the plot forward. It could be an archaeologist if the red bones are some sort of ancient relic.
I'm not entirely sure about all the main characters, but usually there is a protagonist who drives the story forward. There might also be a sidekick or two to provide support and comic relief.
There's Fone Bone, one of the central characters. He's often the voice of reason among the Bones.
In the 'dragon bones novel', there could be a character who is a dragon hunter. He or she might have a personal vendetta against dragons and thus is very interested in the dragon bones. There could also be a young apprentice who is learning about the significance of the dragon bones from an older mentor. And don't forget there might be a character who has a special connection to the dragons, perhaps through some ancient bloodline, and this character's role in relation to the dragon bones would be very crucial.
There could be a group of characters. For example, a team of investigators including a forensic expert who is intrigued by the 'beautiful bones' for their scientific value, a journalist who wants to write a story about it, and a local guide who has some local knowledge related to the bones. However, this is all speculation without actually reading the light novel.
Since it's a graphic novel about a maze of bones, the main characters might be those with special skills. For example, one could be a brilliant puzzle - solver, another might be strong and brave to face the physical challenges in the maze. They are likely to be the ones who are drawn into the mystery of the maze and are determined to find out what lies within it.
I'm not entirely sure, but usually there are brave adventurers in such stories.
I don't know for certain as I haven't read the graphic novel. But it could have a scientist as a main character, someone who is intrigued by the alien bones and drives the investigation.