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.
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.
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.
Typically, there are the kids or travelers who want to cross the bridge. They are the ones who face the challenge of the troll. And of course, the troll is a main character. It is the one that guards the bridge and creates the conflict in the story.
Since I don't know the specific 'under the bridge story', it could be anyone. It might be a local vagrant who spends most of his time under the bridge.
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.