You could create a detective character who is intrigued by the werewolf's existence. This detective could be someone with a troubled past and a sense of justice. Another interesting character could be a street urchin who befriends the werewolf and helps it navigate the city.
A female werewolf character could also be popular. She might be a fierce warrior who defies the gender norms of Westeros. In the fanfic, she could be part of a secret werewolf pack that has its own code and goals, and she plays a crucial role in their operations.
In a werewolf story, the main character is often the werewolf. But you also have the characters around it. There are the fear - stricken common folk who form mobs to hunt the werewolf. There could be a heroic figure, perhaps a brave knight or a fearless bounty hunter, who takes on the task of slaying the werewolf. Additionally, there may be a character who is sympathetic to the werewolf, like a young girl who believes the werewolf is not all bad and tries to save it from the hunters.
One popular character could be the girl who befriends the werewolf boy. She often serves as the connection between the werewolf boy and the human world. Another might be the werewolf boy's mentor or an older werewolf who teaches him about his heritage. And sometimes, there's a villain, like a hunter who is after the werewolf boy, which adds conflict to the story.
Leah Clearwater is a very popular one. In the original Twilight series, she's a complex and interesting character, and in fanfictions, she often takes on even more central roles. Another could be a new, original female werewolf character created by the fanfiction authors. These original characters can bring new storylines and relationships to the Twilight universe that involve werewolves.
Another possible main character could be a wizard or a witch in Metolipoils. They might be involved in the werewolf's story, either trying to control it, cure it, or use it for their own purposes. They could have a long - standing feud with the werewolf's family or be the only one who knows the true origin of the werewolf.
In the Werewolf Kid Story, aside from the kid, there might be an old wise character. This could be someone like a hermit in the woods who has knowledge about werewolves and can guide the kid. Another possible character could be a bully at the kid's school who constantly picks on him before realizing there's something truly different about the kid. And of course, there may be other werewolves in the story, some friendly and some not so friendly.
The main characters could include the werewolf boy, a girl he has feelings for, and perhaps some hunters who are after him. The girl might be a normal human who is intrigued by the werewolf boy, and the hunters could add conflict to the story as they try to capture or kill him.
The werewolf, of course, is a main character. Then there are usually the victims, like innocent villagers or hikers. There might also be a hunter or a person who tries to stop the werewolf.
I'm not sure specifically as I haven't read the novel, but usually there would be a werewolf protagonist. Maybe a young werewolf who is just coming into his or her powers.