The main character is the girl, say, Sophia. Then there could be a group of wolves in the forest. When she turns into a wolf, she has to interact with them. Some of the wolves might be hostile at first, thinking she is an intruder, while others might be more accepting and teach her how to be a wolf, like how to hunt and survive in the wild.
Obviously, the girl is a main character. She could be a curious and adventurous girl, perhaps named Lily. And there could be a wise old wizard who knows about the transformation and might be able to help her reverse it. Another character could be a friendly forest animal, like a squirrel that befriends the girl even when she is turning into a wolf.
In a 'werewolf girl tf story', the girl is a central character. Then there could be her family members who notice the strange changes in her. There might also be a mysterious figure, like a witch or a wizard who has some knowledge about werewolves and either tries to help or hinder the girl's transformation. This figure could add an extra layer of mystery and magic to the story.
Obviously, the girl and the wolf are the main characters. There could also be other animals in the forest like birds or rabbits that interact with them.
One possible plot could be a girl who is in a magical forest and stumbles upon an ancient spell. As she reads it out of curiosity, she starts to transform into a wolf. First, she might notice her senses becoming sharper, like her hearing. Then, her body gradually changes shape, with fur sprouting all over. In the end, she fully becomes a wolf and has to learn to adapt to her new form and the wild environment.
Since we don't know the exact story, it's hard to say for sure. But likely, the boy who transforms into a wolf pup is a main character. There might also be other characters like his family or friends who notice the change or are affected by it in some way.
I'm afraid I don't have enough information to name the main characters precisely. However, if it's a story about a girl turning into a jackal - like being, there could be characters who help her through the transformation process. Maybe there's a wise old mentor figure, or perhaps there are other characters who are also going through similar transformations. And of course, there could be antagonists who oppose the jackal girl for some reason, like a group that fears or hates her new form.
Since I don't know the exact 'Spider Girl TF Story', I can't say for sure. But most likely, Spider Girl herself would be a main character.
Given the title 'shark girl tf story', the obvious main character is the shark girl. But there could be other supporting characters. For example, if the story is set in a coastal town, there might be fishermen who have seen strange things related to the girl. Or if it's a story about her fitting into a new world, there could be other 'creatures' or people in that world who interact with her. There could also be a mentor - like figure who helps her understand and control her new form or abilities if it involves a transformation.
Since we don't have the full story, it's hard to say for sure. But we can assume that the girl who turns into a mouse is a main character. There might also be other characters like the one who caused the transformation or those she meets in her mouse form.
The girl is the central character. There might also be a mentor figure, perhaps an old monkey who has some knowledge about the transformation and can guide the girl (now a monkey) on her journey. And of course, there could be antagonists like other animals that don't want the girl to return to her human form or the one who caused the transformation in the first place.
There could be other characters in the 'nerd girl tf story' as well. It might have a friend or a mentor figure who helps the nerd girl in her transformation. For example, a fellow nerd who encourages her to step out of her comfort zone, or a teacher who sees her potential and guides her in a new direction. There could also be antagonists, like classmates who bully her for being a nerd, which could be part of the story's conflict and her journey of transformation.