Alison

“(...) Some fairy lore makes a clear division between good and wicked types of fairies — between those who are friendly to mankind, and those who seek to cause us harm. In Scottish tales, good fairies make up the Seelie Court, which means the Blessed Court, while bad fairies congregate in the Unseelie Court, ruled by the dark queen Nicnivin. In old Norse myth, the Liosálfar (Light Elves) are regal, compassionate creatures who live in the sky in the realm of Alfheim, while the Döckálfar (the Dark Elves) live underground and are greatly feared. Yet in other traditions, a fairy can be good or bad, depending on the circumstance or on the fairy's whim. They are often portrayed as amoral beings, rather than as immoral ones, who simply have little comprehension of human notions of right and wrong.

The great English folklorist Katherine Briggs tended to avoid the "good" and "bad" division, preferring the categorizations of Solitary and Trooping Fairies instead. (...)”
― Terri Windling, The Faery Reel: Tales from the Twilight Realm

“I have a meanness inside me, real as an organ. Slit me at my belly and it might slide out, meaty and dark, drop on the floor so you could stomp on it.”
― Gillian Flynn, Dark Places

“Quite a number of writers comment on the decidedly human character of the fairies, but it must be obvious that practically all supernaturals partake of human traits, more usually unpleasant ones, being as they are the projections of man's fear and imagination and created by him, psychologically, in his own image. Fairies are frequently described as being peevish, irritable, and revengeful to a degree. Grant Stewart says rather unmercifully of the Scottish fairies that "their appetites are as keen as their inclinations are corrupt and wicked.”
― Lewis Spence, British Fairy Origins

“Fairies in Ireland are sometimes as big as we are, sometimes bigger, and sometimes, as I have been told, about three feet high.”
― William Butler Yeats