I have no idea who Wally Purling is in this story. However, if we assume it's a typical Christmas story, Wally Purling could be the protagonist. He could be an ordinary person who has an extraordinary Christmas adventure, or he could be a symbol of the Christmas spirit, spreading joy and kindness during the holiday season. But this is just speculation without knowing the actual story.
Wally and Kuki are likely characters in a particular fictional universe. They could be from a TV show, a video game, or a comic. Without more context, it's hard to say exactly who they are, but they are the focus of the fanfiction, which means fans are interested in exploring their relationship, be it friendship, romance, or some other kind of connection.
The 'watcher' in 'watcher the real story' might be an ordinary person who by chance witnesses something extraordinary. For example, a passer - by who sees a strange event in the street and then becomes involved in uncovering the real story behind it. It could also be a professional like a private investigator hired to watch someone and then discovers the real story about that person's actions or situation.
Without having read 'the watcher from hooked', it's difficult to say exactly who the 'watcher' is. But generally in stories, a 'watcher' could be a figure that monitors the actions of other characters, perhaps to gain knowledge, to protect, or to plot something against them. It might be a human, an otherworldly being, or even an animal with an unusual awareness of the events in the hooked area.
The 'Watcher' in 'the watcher horror story' is a shadowy character. We don't have a clear picture of who they are. They seem to have some sort of connection to the house, perhaps from its past. They use these letters to create a sense of fear and unease in the family. Their actions suggest a disturbing fixation on the family's every move within the house. It could be an old neighbor with a grudge, or someone with a more sinister and unknown reason for watching the new occupants.