I'm not sure exactly as I haven't read the story in detail, but it could be an explorer. Explorers are often central characters in stories set in wild and uncharted areas like across the Missouri.
The themes in 'across the wide missouri short story' may include adventure. The characters are probably on some sort of journey across the Missouri, which by itself is full of uncertainties and thrills. There could also be a theme of cultural encounter. If the story is set in a historical context, the characters might come across different Native American tribes or settlers from different backgrounds, leading to exchanges of cultures, ideas and values.
I'm not sure as I haven't read the specific 'across the rooftops short story'. But typically, there could be a young protagonist, perhaps a curious teenager who is drawn to the rooftops.
I don't know as I haven't read it. It could be a single protagonist like a traveler who is crossing the bridge.
Another important character could be some of Ellen's friends or acquaintances she meets during her adventures in the wide world. These characters help to further develop the plot and Ellen's understanding of the world around her. For example, a friend might introduce her to new ideas or ways of life that she hadn't considered before.
I don't have enough information to say for sure who the main characters are in 'Missouri Pulp Fiction'. It could have a detective as a main character, a common archetype in pulp fiction, solving crimes in Missouri.
The main theme could be adventure. Rooftops often symbolize a different world above the ground level, and in a short story, characters might be on an adventure across them, exploring new areas or escaping from something.
The big wide mouthed frog is the central character. And the other important characters are the various animals that the frog meets, like the owl, the snake, the monkey etc. Each of these animals plays a role in the story as they interact with the frog and share information about what they eat.
Peep is most likely the central character in 'peep and the big wide world story'. In addition, there could be a whole host of other characters. For example, there might be a family of birds that Peep befriends, or a little bug that gives Peep some important advice. There could also be some human - like figures in the background that influence Peep's world in some way. The story might introduce these characters gradually as Peep moves around in the big wide world and has different experiences.
One main theme could be false hope. Since it's ironic, the characters may have hope as they approach crossing the bridge, but it's dashed in the end.
I'm not entirely sure without reading it thoroughly, but there could be a local fisherman who is very much in tune with the water and the life around it. He might be one of the main characters.