I don't know for sure as I haven't read it. But typically in a story set in the woods, there could be a young adventurer as a main character, someone who is curious and brave.
It's possible that there is a character who is lost in the woods at the beginning of the story. This character's struggle to find their way out could be a central part of the plot. There could also be a forest spirit or guardian - like character that the other characters either befriend or have to face off against as they make their way through the wood. Without reading the graphic novel, it's hard to say exactly who the main characters are, but these are some common types that might be found in such a story.
There could be a hero - perhaps a brave woodsman or a curious explorer who is not afraid to face the unknown. And of course, there would be the demon as a major character. There might also be a wise old figure, like an elder in the nearby village who knows some secrets about the demon in the wood and helps the main character on their journey.
I don't know the main characters in 'Birnam Wood' as I haven't read it. But usually, in a novel, the main characters are the ones who drive the story forward. They could be people living in or around Birnam Wood, like a local woodsman, a young adventurer, or a reclusive hermit.
I'm not sure specifically as I haven't read the exact 'in the dark wood novel'. But generally, there could be a protagonist who is likely a lost or confused individual trying to find their way in the woods.
In 'Norwegian Wood', Toru Watanabe is the central character. He is a young man trying to understand his feelings and place in the world. Naoko is another important character. She has a complex personality and struggles with mental health problems. Midori is also a main character. She is a vibrant and lively girl who has a relationship with Toru. These three characters play significant roles in driving the story forward.
Since I haven't read the novel, I can't say for sure who the main characters are.
Since I haven't read the 'dark wood circus novel', I can't say for sure. But it might have circus performers like acrobats, clowns, or ringmasters as main characters.
I don't know since I haven't read the book. But usually, in a novel with gods as part of the title, there might be some characters who are believers or followers of these gods.
I don't have information about the specific main characters in 'drift wood visual novel' as it's not a widely known title to me. But they could be beachcombers, fishermen, or perhaps even the spirits that are associated with the drift wood in a more fantastical setting.
Since we don't have much information, the main characters could be a family. Maybe a father who built the house of wood and glass with his own hands, a mother who takes care of the family inside it, and their children who grow up with stories related to the house. Or it could be a group of friends who decide to renovate the old house of wood and glass together, and their different personalities and dreams are explored throughout the novel.
The main character is the man. He is the one who has a relationship with the wood, whether he is cutting it, using it for building, or some other activity related to the wood.