The creation of Mommy Long Legs was probably inspired by the need to create a new and distinct horror character. Horror has a long history of using body horror and the distortion of human - like forms to create fear. Mommy Long Legs with her long legs and disturbing appearance fits into this tradition. It could also be inspired by psychological fears, such as the fear of being trapped or the fear of a malevolent caretaker. The creators took these concepts and combined them to form the character of Mommy Long Legs, all without it being based on a true story.
It depends. Sometimes stories labeled as such might draw inspiration from real events but have fictional elements added. So, it's not always a straightforward yes or no.
I don't think Long Legs was a true story. Stories like this often come from the writer's creativity and are not tied to actual happenings. It's just a made-up tale to entertain the readers.
Horror is also a prevalent theme. Since Mommy Long Legs has a somewhat spooky appearance, fanfictions often play on that to create a sense of fear and unease. For example, stories might involve her chasing after characters in a dark, foreboding environment.
Some 'mommy long legs fanfic' might focus on her relationships with other characters from the same universe. Maybe she forms an unlikely alliance with a character that was once her enemy, and together they face a greater threat that endangers their entire world.
Long Legs is typically not based on a true story. It's more likely to be the product of the author's imagination or a fictional concept developed for entertainment purposes.