'Bogies, 'Bogles', 'Bugs', or 'bug-a-boos' are names given to a whole class of mischievous, frightening and even dangerous spirits. Their temperments can range the spectrum from benign to malevolent. They can be a male hobgoblin who is only up to evil and capricious acts of wrongdoing. He enjoys tormenting any traveler who is unfortunate enough to cross his path.
Sometimes they go about in troops, like the Hobyahs, but as a rule they may be described as individual and solitary fairy members of the Unseelie Court. A nickname of the Devil in Somerset is 'Bogie', presumably to play him down a little, for bogies generally rank rather low in the retinue of hell. They are often adepts at shape-shifting, like the Bullbeggar, the Hedley Kow and the Picktree Brag. These are generally no more than mischievous. The well-known Boggart is the most harmless of all, generally a Brownie who has been soured by mistreatment; among the most dangerous are the fiendish Nuckelavee and the Duergar, and other examples appear under Bogy or Bogey-Beast. But even so, some bogies, like minor devils, are just simple and gullible.