I don't know as I haven't read it. It could be a group of misfits who gather under the bridge, like a young runaway, an old storyteller, and a street artist.
Since I'm not familiar with the 'under the bridge novel', it's difficult to name the exact main characters. However, it might be about a person who is trying to escape from his past and finds refuge under the bridge. And there could be other characters like a local who tries to help him or a bully who makes life difficult for those under the bridge.
There could be a group of characters. For example, an older character who has a lot of life experience and serves as a guide for a younger character. The younger character might be struggling with something from the past, and the older one helps them see that it's like water under the bridge and they should focus on the present and future. There could also be some side characters that add to the overall story and the development of the main characters.
I'm not entirely sure who all the main characters are specifically. But usually in such a story, there would be a central character who is likely the protagonist that leads the story's development in the setting under the bridge.
Typically, there is the troll, which is the main antagonist. It lives under the bridge and tries to stop people from crossing. And then there are the travelers or the heroes who want to cross the bridge. They could be villagers, knights, or just ordinary people on a journey.
I'm not sure as the title doesn't give much away. It could be anyone from homeless people to passers - by who had an important role in the events under the bridge.
There's the monster, of course. It's the main source of conflict in the story. It could be a big, hairy, and scary - looking creature with sharp teeth and claws. And then there are often villagers or townspeople who might be aware of the monster and warn the travelers about it.
Since I don't know the exact 'under the bridge original story', I can't say for sure what the main characters are. It could be a lonely traveler who takes shelter under the bridge, or it could be a group of children exploring the area under the bridge.
I'm not sure as I haven't read this novel specifically. But it could potentially be about the lives of people who are associated with the area under the bridge, like homeless people or those on the fringes of society.
The main character is the lawyer who represents the Soviet spy. There are also likely characters involved in the espionage world and government officials.
There are two main characters in 'Bridge to Terabithia'. Jess Aarons, a young boy with his own insecurities and dreams, mainly his aspiration to be the fastest runner in school. And then there's Leslie Burke, a creative and intelligent girl who moves to Jess's town. They together build the magical Terabithia. Other characters like Jess's sisters and parents also influence the story, but Jess and Leslie are the key figures.
Since we don't have much information about the 'the bridge series novel', the main characters could be diverse. It might be a family whose lives revolve around the bridge. There could be a young adventurer who discovers something extraordinary about the bridge. Maybe there's an old storyteller who knows all the legends associated with the bridge and is one of the main characters in the series.