Without reading the 'the bridge graphic novel', it's difficult to say who the main characters are. But they could be related to the bridge in some way. Maybe there's a bridge keeper who has to protect the bridge from some sort of threat. Or it could be a group of friends who use the bridge as their meeting place and then get involved in an adventure that takes them far from the bridge.
Since I'm not familiar with this particular graphic novel, I can only speculate. The main characters could be from different sides of the bridge. For example, there could be a character from the wealthy side of the town near the bridge and another from the poorer side. Their interactions and the differences in their lives could be a central part of the story. Or perhaps there's an engineer who designed the bridge and now has to deal with some unforeseen problems regarding it, and this person could be one of the main characters.
I don't know as I haven't read it. But typically in a graphic novel, the main characters are those who drive the story forward. They could be people with special abilities, or just ordinary folks caught up in extraordinary situations.
It's possible that there are fictional characters representing different groups. For instance, a young artist who finds inspiration in the beauty of the Brooklyn Bridge. Or perhaps a family who has a long - standing connection to the area around the bridge, and their story is intertwined with the bridge's history throughout the graphic novel.
The two main characters are Jess Aarons and Leslie Burke. Jess is a boy who is initially somewhat lonely and struggling with his place in his family and at school. Leslie is a new girl in town who is very imaginative and different from the other kids. Together, they create the magical world of Terabithia.
I don't know the main characters in 'troll bridge graphic novel' since I haven't had the chance to read it.
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.
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.
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.
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.
There may be a female character who has a significant relationship with Alexander. Maybe she is his love interest or someone who challenges him in different ways. In many novels, such a character helps to develop the main character's story further.