Since I'm not familiar with this 'tick tick slide horror story', it's impossible for me to determine the main characters. It could be a group of kids who stumble upon a haunted slide and the story could be about their experiences. Or it could be a lone traveler who encounters the strange ticking and the slide in an isolated area. But again, this is just guessing.
I don't know as I haven't read it, so I can't say who the main characters are.