Fairy

A species of supernatural being resembling a diminutive human with the wings of a butterfly. Fairies lived underground, along with the Slime-folk, the Raven Clan, and creatures that resembled leaf-blowers. The Slayer Organization helped the four races band together and defeat a horde of demons, led by Yamanh of Hoht, who were coming from deeper underground to attack both them and the surface world.

They possibly laid eggs in others' ear canals, non-fatally, but the fairy who claimed to have done so to the Buffy decoy later denied it, embarrassed.