Maybe there are some lead animals like an old and wise owl that gives advice about the bridge, and a strong beaver that actually helps build or repair the bridge. There could also be a curious little mouse that discovers the bridge first.
The main idea might be the journey of the animals related to the bridge. Maybe it's about how they overcome obstacles associated with the bridge to reach a new place.
There might be a builder of the bridge as one of the main characters. The story could focus on their motivation for building the bridge, their struggles during the construction, and how the bridge impacts their own life as well as the lives of others. They might have a backstory that is revealed through the short story.
I don't know the 'the bridge game story' well enough to say who the main characters are. But they could be the bridge players, like an old man who is very skilled at the game, a young woman who is learning, and maybe a couple who play together often.
I'm not sure as I haven't read the specific 'on the bridge short story', but it could be a lone traveler who is the main focus.
In 'the animal story', the main characters could be some small insects such as ants. The story might focus on how they work together in a colony, their division of labor, and how they face threats from other creatures. It could also be a story about a single large animal like an elephant, and its journey through the African savannah.
I don't know the specific 'under the bridge the true story', so I can't tell who the main characters are.
The main characters are usually the troll and the traveler who wants to cross the bridge.
I'm not sure specifically who the main characters are without more information about this 'Bridge Spies' true story. There could be intelligence agents, double agents, or regular people caught up in the espionage events related to the bridge.
Since I'm not familiar with the 'the bridge partner short story', it's impossible to determine the main characters precisely. But given the title, the two individuals who are partners in playing bridge are most likely the main focus. There might be additional characters like the people running the bridge club where they play, or friends who introduce them to the game. These secondary characters could play important roles in shaping the story and the relationship between the main bridge partners.
The main characters in the 'Bridge at Remagen: True Story' are probably military personnel. There would be army commanders who made the strategic decisions regarding the bridge. Then there are the soldiers on the ground, those who were sent to defend or capture the bridge. Some of these soldiers might have shown extraordinary courage or made crucial decisions during the events. There could also be engineers, either military or civilian, if the bridge had some unique engineering features that affected the story. And, potentially, local civilians who might have witnessed or been affected by the fighting around the bridge.