Since we don't have specific information about the book, we can only guess. There might be a fearless warrior as a main character who is on a quest related to the troll mountain. There could also be a local guide who knows some secrets about the mountain but has his own motives. And perhaps there's a female character with special abilities who plays a crucial role in the story on Troll Mountain, whether it's in dealing with the trolls or uncovering the mysteries of the place.
There could be a young protagonist who is curious about the Troll Mountain. And perhaps an old wizard who guides the young one through the challenges on the mountain. There might also be a group of trolls with one being more friendly or sympathetic towards the human characters.
The trolls are the central characters in the 'in the hall of the mountain king troll story'. However, there could also be other minor characters like the occasional brave human who ventures into the hall, or maybe some small magical creatures that co - exist with the trolls in the mountain environment.
I haven't read it yet, so I'm not sure exactly what it's about. But generally, it might be about adventures on a troll mountain, perhaps with characters exploring the area, facing challenges from trolls or the environment of the mountain.
There could be a brave troll warrior as a main character, who is known for his great strength and combat skills. Maybe there is also a wise old troll who serves as an advisor, guiding the younger trolls through the chaos of the war. And there might be a female troll character who is not only strong in battle but also has some special abilities, like being able to communicate with animals or having some sort of healing power that helps the wounded trolls in the war.
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 Hilda. She is likely the central figure who drives the story forward. And the troll is another main character. It's their interactions and the relationship between Hilda and the troll that might form the core of the story in the graphic novel.
Then there are the characters in the ranch where they work. For example, the boss who hires them on Brokeback Mountain. These minor characters help to set the context of the story, showing the kind of working environment and the social environment in general that Jack and Ennis are part of.
The main characters are usually the troll and the traveler who wants to cross the bridge.
Most likely the main character is the grumpy old troll itself. There might also be some other characters like the people or animals that the troll interacts with, such as the villagers who try to cross the bridge that the troll guards.
The title 'harry bribes the troll fanfic' clearly indicates that Harry is a main character. He is the one taking the action of bribing. The troll is another main character as it is the recipient of the bribe. However, in the context of the Harry Potter universe, there could be other characters that play important roles. For example, Hermione might be there to offer advice to Harry about whether bribing the troll is a good idea or not. Ron could also be involved, perhaps he is initially against the idea but later comes around. So, while Harry and the troll are the obvious main characters, there may be others depending on how the fanfic is written.
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.