I don't know for sure. But it could be the children who own or use the magic bed.
Perhaps the main characters are a group of siblings. They find the magic bed in their attic or something. One of them might be a brave and curious child who always initiates the adventures on the magic bed. There could also be a younger sibling who is a bit scared at first but gradually becomes more confident as the story progresses.
Well, in 'the magic bed children's story', perhaps the magic bed could be a portal to different worlds. It might take the children to places full of wonder, like a land of talking animals or a floating island in the sky. The story could revolve around the children's experiences in these magical places and how they grow or learn from them.
The main characters are likely the fairy and the child with the lost wings.
Since I don't know the specific 'the king's bed story', it's hard to say. But likely, the king himself would be a main character. There could also be servants who take care of the bed and the king's chambers.
Since I don't know the specific 'the monster bed story', it could be a child who discovers the strange bed. Maybe there's also a parent or an older sibling who doesn't believe the child at first about the strange things happening with the bed.
Perhaps it's a little boy who has a special pet. The boy and his pet could be the main characters, going through various experiences like helping their neighbors or solving a mystery in their neighborhood.
In some children's stories, it could be a sleepy little dragon. Dragons, especially young ones, might get tired from all their flying and exploring. The bed could look like a great place to curl up and take a nap. However, because of their size, they might have made a bit of a mess while getting comfortable.
It could be a naughty little bear. In many children's stories, bears are curious and might wander into someone's house and find a cozy bed to nap in.
Based on the title, the main characters are likely the man who is in her bed and the woman whose bed it is.
Obviously, the main character is the boy. But depending on the story, there could be other characters too. Maybe his parents if they are looking for him while he's under the bed. Or if it's a more adventurous story, there could be a pet that joins him under the bed, like a curious cat.
The main character is the woman who was in the abusive relationship. And her husband who was the abuser are the main characters.