Fears are beings who pursue the Runners, for unknown reasons. Perhaps to feed? Perhaps for sadistic amusement? Bringing punishment to the wicked? The answer is unclear. Fears are so diverse that to claim they are all of the same race is a stretch, and trying to assign them all qualities common to all known Fears is very difficult. Below is a list of all known Fears. 

The Slender Man

The Plague Doctor

The Archangel

The Pale Maiden

The Wooden Girl

The Empty City