She can be shown as a misfit. This might isolate her from other characters, and when the scary events start to unfold, she has no one to turn to or no one believes her warnings. For instance, in a story set in a school, the fat girl might be bullied and then be the only one to sense the presence of a malevolent spirit, but her classmates just laugh at her.
One common trope is that she might be the first victim. In many scary stories, the character who doesn't fit the 'typical' body standard is often singled out as an easy target for the antagonist. Another could be that she is misjudged. People in the story might assume she is weak or helpless because of her size, but she could turn out to be very strong or resourceful when facing the horror. Also, she could be a red herring. The story might make you think she is the source of the horror due to her appearance, but in fact, she is just another victim.
One common trope is that the fat girl might be the first victim. In many horror stories, the character who doesn't fit the typical 'attractive' or 'athletic' stereotype is targeted first. For example, she could be lured into a haunted house by a seemingly friendly entity and then meet a terrifying end.
She can become the hero. Instead of being the victim, she uses her wits and strength (both physical and mental) to defeat the evil. For example, if it's a haunted house story, she might figure out the secret to banishing the ghost while the others are panicking.
In some scary stories, the fat woman might be a ghost of a wronged person. For example, she could have been mistreated during her life because of her size and now haunts the place where she suffered. Her presence is often associated with cold drafts, strange noises, and a feeling of unease. She might be seen as a symbol of the victims of discrimination and the dark secrets of the past.
Well, it could be a specific character created by a particular author in a collection of scary stories. Without more context, it's hard to say exactly who she is. Maybe she represents a certain fear, like the fear of the unknown or the fear of something that seems abnormal, like her 'fat' and 'white' appearance being used to make her seem otherworldly and scary.
There's a story where a fat woman was wronged in a small village long ago. She was shunned and mistreated. After she died, her spirit roams the village at midnight. She appears as a large, shadowy figure. If someone is out alone at that time, they might feel a cold, oppressive presence as she nears, as if she's trying to make them understand her pain. The wind seems to howl louder and the air gets colder when she's close.
Often, it's the unknown associated with her. We don't know her motives or what she's capable of. She could be a vengeful spirit, and her fatness might be related to some dark past or curse. Maybe she was cursed because of her greed or some other sin, and now she takes it out on the people around her. This mystery makes her very scary.
The fat lady in scary stories can also play on body image stereotypes in a negative way. Society has certain ideas about how people should look, and when a fat lady is made into a scary character, it's sometimes using those pre - existing ideas to create a sense of horror. However, this is also a rather unfair and discriminatory trope that should be analyzed critically in the context of the stories.
She might not be a villain all the time. In some stories, she could be a victim of her own circumstances. Maybe she was once a normal person who had something terrible happen to her, which made her seem scary. It could be that she is actually trying to protect something or someone, but her appearance and actions are misinterpreted as evil.