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.
In the 'Spider Girl TF Story', the most obvious main character is Spider Girl. However, there could be a cast of supporting characters. There might be a mentor figure, perhaps an older superhero or a scientist who understands the nature of her transformation and can guide her. There could also be a love interest, someone she has feelings for and who might be in danger because of her battles. And villains are also likely to be main characters in a sense. They could be arch - enemies who constantly try to outwit her, like a powerful super - villain with a vendetta against Spider Girl or a group of villains who team up to take her down. These characters would all interact with Spider Girl and drive the plot of the story forward.
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.
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.
Since I don't know the exact 'fox girl tf story', it's hard to say. But it might have the fox girl herself as a main character, and perhaps someone who witnesses or helps with her transformation.
Since I don't know the exact 'good girl tf story', it's difficult to say. But if it's a typical story, the main character would likely be the 'good girl' herself. There might also be other supporting characters such as her friends, family members, or a mentor figure who helps her in her journey.
The main character is probably the girl who is at the center of this transformation. There might also be other characters like her friends or family who react to her change. Maybe there are antagonists who cause the transformation or try to take advantage of her new state in the story.
Based on the title, it seems the main characters would be a girl who is described as 'good' and a dog.
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.