Without having read or known more about this particular visual novel, it's just speculation. However, perhaps there's a scientist character who created the keyboard - head character in the story. There could also be a love interest for the keyboard - head character, someone who sees past their strange appearance and falls in love with their true self, which would add a romantic sub - plot to the story.
I'm not sure specifically as it could be a rather unique or niche visual novel. It might involve a character with a keyboard for a head in some sort of strange or interesting story world. Maybe it's about a world where technology and the human form are merged in a very odd way.
I'm not entirely sure of all the main characters, but usually there's a protagonist who is at the center of the strange events.
Since we don't have more information about the 'A Severed Head Novel', we can only speculate. There might be a journalist character who is trying to get a scoop on the story of the severed head. They would be nosy and eager to expose the truth. There could also be a group of bystanders or witnesses who saw something related to the severed head incident and their testimonies and actions might be crucial in the development of the story.
I don't know for sure since I'm not familiar with this particular light novel. But it could be the character with the beast head as one of the main characters, along with some friends or foes that are related to the mystery or story around the beast head.
I don't know the main characters in the 'pumpkin head graphic novel' without more information. It could be the pumpkin - headed figure itself as a main character.
I'm not sure specifically as I haven't read it in detail. But it's likely to have some tough and street - smart characters, perhaps a detective or an ex - military type.
Since I haven't read the novel, I can't say for sure who the main characters are.
I don't have information about the main characters in 'Head Games The Graphic Novel' as I haven't read it. It could be a diverse set of characters though, perhaps including a clever protagonist who is good at these 'head games' and some antagonists who try to outwit them.
I have no specific information about the 'a3 visual novel' characters. However, in many visual novels, there are often diverse characters. There could be a young hero or heroine as the main character. Maybe there are some mysterious figures that are part of the 'a3' concept. They could be people with special abilities or knowledge that the main character has to interact with, either as allies or antagonists.
I don't have enough information to determine who the main characters in '707 visual novel' are. It could have a diverse cast of characters such as a brave hero, a cunning villain, and some interesting side characters.