Not having full details about the 'the girl in the wall story', we can assume the girl is a main character. There could be other supporting characters. For instance, if it's a mystery - type story, there might be a detective - like figure trying to solve the mystery of the girl in the wall. Or if it's a fantasy story, there could be magical creatures that are either helping or hindering the girl's situation in relation to the wall.
As the details of the 'girl in the wall story' are not clear, it's difficult to determine the main character precisely. However, if it follows the common idea of a girl being in a wall, she would be the main focus. She could be a young girl with a unique backstory, like she was put there by some villain, or she ended up there by accident while exploring an old building. The story would likely revolve around her experiences and how she either gets out or what her purpose is while being in that situation.
Obviously, the two main characters are the Wall Street bull and the little girl.
I'm not sure who the main characters are in the 'War of the Wall Story' as I don't have more context. It could be leaders of the opposing sides in the war over the wall, or ordinary people who are affected by the wall and take a stand.
Since I don't know the exact 'the wall short story', it's hard to say. But often in stories about a wall, there could be a builder of the wall, someone who is trapped by the wall, or a person who is trying to break the wall down.
Since I don't know the exact 'the long wall story', it's hard to say who the main characters are. They could be the builders of the wall, if it's a story about construction. Or perhaps people who live near the wall and are affected by it.
The main characters are Wall - E and EVE. Wall - E is a small, curious and lonely robot on Earth. EVE is a more advanced and sleek robot sent from space on a mission.
I'm not sure specifically as we don't have much information about this short story. But usually, in a story about going beyond a wall, there could be a brave adventurer who is eager to explore the unknown.
I'm not entirely sure without reading it closely, but there might be an artist or two. They would be the ones involved in the so - called 'war' over the wall, either trying to paint on it or stop others from doing so.
I'm not sure exactly without reading it again, but there could be an artist and some local residents.
There is likely a main character who is the one to first encounter the door in the wall. This character is probably going through some sort of internal struggle, perhaps feeling unfulfilled in his normal life. And then there could be other characters who either don't believe in the existence of this door or are envious of the main character's discovery. For instance, there might be a friend or a family member who dismisses the idea of the door as a childish fantasy, which adds to the conflict in the story.