Discord, someplace in between a spirit of bedlam and a god of chaos, hews closer to the characterization of fairies and their ilk as becoming spiteful and petty. Then, in time 4, we satisfy Earth fairies. Also, the April Fool in "Fools Day Out" named creating the Earth to go into an Ice Age by hitting a number of planets and things a "prank" or "joke". In "Crocker of Gold" there are a bunch of leprechauns referred to as the McPunchies.