We can't really tell who the main characters are in 'the bridge science fiction' without having read it. There could be a group of rebels who want to destroy the bridge for some reason, or a hero who tries to protect the bridge from all threats. It all depends on the plot and the world that the science fiction story creates.
Since I don't know the specific 'the bridge science fiction', I can't say for sure who the main characters are.
I'm afraid I can't tell you the author of 'the bridge science fiction novel'. There are countless science fiction novels, and this one doesn't seem to be a widely known one (at least to me). You could try searching for it in local libraries, specialized bookstores, or on the internet using more detailed search terms related to the plot or any other information you might have about it.
Jess's parents are also part of the story. His father is a bit strict and works hard to support the family. His mother is busy with taking care of the household and the children. Their presence and the way they interact with Jess influence his character development throughout the novel.
Bridge to Terabithia isn't classified as science fiction. It focuses on the imaginative world and the growth of the characters rather than typical science fiction elements like advanced technology or space exploration.
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.
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.
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.
I don't have enough information to tell who the main characters are. Since it's just the title 'across the bridge novel', it could have a wide variety of character types, like a young adventurer, an old hermit, or a family trying to cross the bridge for some reason.
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.
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.