There's no way to know without more information. However, in many graphic novels, the main characters are often ordinary people who get thrust into extraordinary situations involving secrets. So it could be a young person, maybe a student or an artist, who discovers something strange and is then drawn into a world of secrets. There may also be antagonists who are trying to keep the secrets buried and will stop at nothing to do so.
I'm not sure exactly as I haven't read it. But it could be the people who live in the house, like a family. Maybe there's a curious child who starts to discover the secrets, or an old caretaker who knows more than he lets on.
I don't know the exact main characters as I haven't read the graphic novel. But they could be people like a detective trying to solve the city's mysteries, or a local who has stumbled upon some dark secrets of the city.
Since it's about nurses' secrets, the main characters are probably experienced nurses who have a lot of stories to tell. There might be a head nurse who has to deal with both the staff and the hospital management. And there could be a young nurse who is just starting out and learning about all these secrets. Maybe there are also some patients who are central to the secrets, like a patient with a mysterious condition or a difficult family situation.
I'm not sure who the main characters are without reading it. But they could be the Greystone family or a group of kids who are trying to figure out the secrets and deal with the strangers.
I haven't had the chance to read 'Public Secrets a Novel' so I can't name the main characters. However, in many novels, main characters can include protagonists who are trying to uncover the public secrets, antagonists who are trying to keep the secrets buried, and perhaps some supporting characters who are either aware of the secrets or are unknowingly affected by them. These characters would interact in ways that develop the story and the concept of the public secrets.
I'm not sure exactly as I haven't read it. But typically in a novel about a house of secrets, there would be a curious protagonist, maybe a young person who is new to the house or has just inherited it and starts to explore its secrets.
Since the title implies a focus on kinship, it's likely that there are siblings among the main characters. They could be involved in uncovering or hiding family secrets. There might also be an older family member, perhaps a grandparent, who has knowledge of the secrets and whose actions or inactions influence the younger characters.
I don't know for sure since I haven't read it. But usually in a novel, the main characters could be those directly involved with the seven secrets, either as seekers or keepers of the secrets.
I don't know as I haven't read the book. It could be the owner of the chateau, perhaps a young explorer who stumbles upon the chateau and starts to unearth the secrets, or a family who has lived in the chateau for generations.
I don't know for sure as I haven't read the book. But it might have ranchers as main characters, given Wyoming's ranching background.