In 'Jeff the Killer Horror Story', one of the things that makes it so terrifying is how it plays on our basic fears. Fear of the unknown, fear of being hunted, and fear of a remorseless killer. Jeff seems to have no boundaries or moral constraints. The descriptions of his presence, like the creaking of floorboards when he's near, or the feeling of being watched, all add to the overall sense of horror that grips the reader.
Yes, it is quite popular among horror fans. The dark and twisted nature of both characters makes their love story, if you can call it that, a very unique and interesting concept in the horror genre.
It's fairly popular. The contrast between Jeff's pure evil and Jane's more vengeful but still somewhat complex nature makes for an interesting dynamic in fan - fictions. Fans like to explore how these two could interact in a romantic or at least a relationship - like way, even if it's very different from normal relationships.
Jeff the Killer is purely fictional. It's a made-up tale that has gained popularity in certain online communities, but there's no truth to it. It's all for scaring and thrilling those who enjoy such horror concepts.