Thump. The quiet sound startled Jack out of his reverie and pulled his gaze away from Jamie, his peacefully sleeping charge. So you want the guarding spirits to be the best of the best. This is an AU where there are a lot of Guardians, but not every spirit gets to be a Guardian because if the Guardian fails and the kid dies, then they become a Boogeyman (of which there are quite a few). Eventually, they grow to like it … perhaps a little more than they should. They do not get on at all, but are forced to play happy families for the sake of their respective kids. Jack is Jamie’s guardian, and Bunnymund is newly appointed as Sophie’s. The Guardians are actually (or additionally) guardian angel-type figures, who look after specific children.