Classification of fairies.

Courts:

 Seelie: Seelie fairies, or "blessed fairies" are the goodly, more benevolent fairies, such as; elves, goblins, hobgoblins, gnomes, sylphs, etc.  Even though Seelie Court fairies are generally good, they still enjoy a good prank on humans and still get angry because of insults, but they are still helpful and kind.  The term "Seelie Court" refers to the interracial war of the fairies, when King Lu called all loyal fairy peoples to his fairy fort, Seelie, most answered the call, some did not.

 Unseelie Court: Unseelie fairies, or "unholy" fairies are malicious, harmful, human-hating fey; boggarts, mares, ogres, fomorians, dark elves, bokwus, etc.  The Unseelie fairies, unlike Seelie fairies' playful pranks, hate humans and play deadly gags, or simply  kill humans for sport, such as sirens, and Unseelie Court fairies only take humanoid forms to deceive men, while Seelie fairies take human-like forms to fit in.  The Unseelie Court was the group of fey who did not answer High King Lu"s call, they instead joined the fomorian-led Fir bolg legions.  Even though Unseelies were traitors, the fairy High Kings were to treat them as they would any other fairy.

Classes:

 Trooping and Solitary: a further classification of fairies are the four classes, trooping, solitary, wild, domestic.  Trooping fairies, along with domestic faeries, are most commonly seen by humans.  Elves are trooping fairies, and gnomes, leprechauns, goblins, and sylphs.  They are called trooping because they used to accompany the High King as he traveled around the world visiting fairy settlements.  Solitary are fairies who generally hide from humans and live in small groups.  Leshies, kappas, kelpies, and spriggans are solitary fey. 

 Wild and Domestic: domestic nature folk live within human dwellings, and can help humans or trouble them.  Hobgoblins are Seelie domestic fey, and they live to serve humans, while redcaps haunt abandoned buildings.  Hobgoblins, boggarts, brownies, redcaps, and kobolds are domestic.  Wild can be rather over-playful, like satyrs, or raving and roving; trolls, harpies, and hinkypunks.  Wild fairies are, satyrs, poltergeists, windigos, nyads, and faery dogs.  

Elements:

 Fire: fire fey are few, but are generally impulsive.  Imps, salamanders, western dragons, and fomorians are fire elementals.

 Water: water sprites can be calm and graceful, or fast and deadly.  Kelpies, nyads, kappas, grinylows, merfolk, and russlka are water fairy. 

 Air: like fire, are few, but they are calm and light-hearted.  Hinkypunks, pixies, bakus, sylphs, and werecats are air sprites.

 Earth: earth fairy are the most populous fey, and are usually down to earth.  Elves, gnomes, leprechauns, ogres, gremlins, goblins, and spriggans are earth elementals.