Hobgoblins

According to Katharine Briggs' An Encyclopedia of Fairies, hobgoblins are friendly folk related to brownies. From the Puritans on, the word was used to refer to wicked goblins, but in Shakespeare's 'Midsummer Night's Dream,' Puck is referred to as a hobgoblin and does not protest. 

One type of hobgoblin is the Will O' the Wisp. Briggs says that hobgoblins are generally good-humoured, though they do love practical jokes, and must not be crossed. Wikipedia says they're small, hairy men who do small, odd jobs round the house just as a brownie would. In return, they expect food; but offer them clothing, and they will depart. They can, if Puck is to be believed, shape shift. 

In JRR Tolkien's The Hobbit, the Uruks or Uruk-hai were originally written as hobgoblins, back before Tolkien realised hobgoblins were of small stature. Perhaps following this mistake, the role-playing game Dungeons and Dragons (D&D) uses hobgoblins as a larger, more menacing type of goblin. Other role-playing games have also followed suit. 

For more information, visit http://en.wikipedia.org/wiki/Hobgoblin.

Image from Google Images: https://www.google.com/search?hl=en&site=imghp&tbm=isch&source=hp&biw=1024&bih=600&q=hobgoblin&oq=hobgoblin&gs_l=img.3..0l10.1577.3776.0.4880.9.4.0.5.5.0.88.304.4.4.0....0...1ac.1.25.img..0.9.327.D8Vb_1UOxo4#bav=on.2,or.r_cp.r_qf.&fp=d750b992d784f8&hl=en&q=Puck&sa=1&tbm=isch&facrc=0%3Bpuck%20midsummer%20night's%20dream%20drawing&imgdii=_&imgrc=_.