Demonic Guardians

This AU is unique, in a sense with how much it can differ from one fan-fiction to another fan-fiction. One thing is a constant: at least one or more characters have a demonic guardian by their sides. Some versions may have many characters have a demonic guardian, while another has very few characters have a demonic guardian.

List of examples:

 * https://archiveofourown.org/works/6892282