It could be an ordinary woman living in a small town. She might be a kind - hearted person, like a teacher or a nurse. Her transformation into a rat would be a huge shock not only to her but also to the people around her.
Another possibility is that it is a magical self - transformation. The woman might be in a desperate situation and made a deal with some magical creature or force. In exchange for something she wants, like saving her loved ones, she has to turn into a rat. And then the story could be about her adventures as a rat while still having her human consciousness and trying to find a way to break the deal and turn back.
Not knowing the details of the 'rat man story', the main character could be a person with a unique trait or job. Maybe he's a rat catcher, and the story is about his daily struggles and experiences with rats. Or perhaps he's a magician who can communicate with rats and uses their help to perform magic tricks, and the story follows his journey using this special ability.
Sasuke could also be an interesting choice. He is always seeking power, and a rat contract could offer him new ways to gain information about his enemies. He could use the rats' stealth abilities to his advantage in his quest for revenge.
A fashion - forward college student would make a great main character. She's always looking for the next big trend. When she discovers latex fashion, she dives in headfirst. As she experiments with different latex looks, she undergoes a transformation not just in her appearance but also in her self - perception. She becomes more assertive and less afraid to show her unique style.
The main character could be a regular guy, like a farmer. He's used to dealing with bulls on his farm. One day, he accidentally disturbs an ancient magic hidden in his barn, and this magic starts the transformation process. He's a relatable character as he's just an ordinary person thrust into this extraordinary situation.
It could be a young college girl who is tired of being unnoticed. So she becomes the main character in her own transformation story.
A vet. They are already familiar with animals and would be in a position to notice the strange transformations first.
Ezra Bridger could be a great main character for a transformation story. He has a strong connection to the Force, so perhaps he could be transformed in a way that enhances his Force abilities even more. For example, he could be exposed to a powerful Force - rich energy source that changes his physical form slightly, giving him the ability to fly or become intangible at will. His journey of discovery and learning to control these new powers would make for an exciting story.
Obviously, the main character would be the sorrowful woman herself. She is the central figure around whom the story revolves.
One reason could be a magical curse. Just like in many fairy tales, an evil sorcerer or witch might cast a spell on the woman out of jealousy or spite. For example, if the woman is too beautiful or has something the villain wants.