Most likely the main characters would be the well - known TF2 characters like the Scout, Soldier, Pyro, Demoman, Heavy, Engineer, Medic, Sniper, and Spy.
Not having read the 'bimbo tf story', it's impossible to accurately name the main characters. However, it's likely that there is a central figure who goes through the 'tf' (transformation) into a bimbo - like state. There might also be supporting characters like friends, family members or antagonists who either encourage, oppose or are affected by this transformation.
In a possible 'tf2 love story', the main characters could be the Heavy and the Pyro. The Heavy is strong and protective, while the Pyro is a bit of an enigma. Their relationship could be based on the Heavy's natural inclination to protect the more unpredictable Pyro. Maybe in the story, the Pyro shows a side of themselves that only the Heavy gets to see, and that forms the basis of their love story.
Since I don't know the exact 'inanimate tf story', I can't say for sure. But it could be the inanimate objects themselves that are the main characters, like a key that is the protagonist in a story about unlocking secrets and it transforms during the process.
Not having read the'reader tf story', it's impossible to accurately name the main characters. But in a general sense, if the story is about a reader's journey, the reader would be a key character. There could be a mentor - like figure who guides the reader in their exploration, maybe an old - fashioned bookseller who imparts wisdom about different books. Or there could be antagonists, like someone who tries to stop the reader from reading or a character from a book that escapes into the real world and causes trouble for the reader.
Without knowing the specific 'dragon tf story', we can only make assumptions. The dragon is surely a central figure. If it's a story about the dragon's transformation due to a curse, there could be a character who cast the curse, like an evil witch or a vengeful mage. On the other hand, if it's a more positive transformation story, there could be a wise old mentor figure who guides the dragon through its new form. And there may be other characters like villagers or townspeople who are affected by the dragon's transformation and play important roles in the story.
In addition, there could be a villain, like a hunter who is obsessed with killing werewolves. He targets the woman werewolf specifically, seeing her as a great prize. This hunter character adds conflict and danger to the story as the woman werewolf has to constantly evade him while dealing with her own transformation issues.
Maybe the main characters in the 'animal crackers tf story' are the animals themselves that come to life from the crackers. There could also be a villain, like a greedy factory owner who wants to use the power of the animal crackers for his own bad purposes. And of course, there might be a hero, like a kind - hearted little girl who tries to protect the magic of the animal crackers.
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.