Allow me to, sadly once again, restate what I just said; *Creatures of Fey or Fae domain, however spelled, are creatures from another plane of existence that have no logical concept of good or evil. Just because us humans can apply good or evil to humans, yordles, or whatever all else, does not mean that Faeries, Sprites, etc. Have the same morality spectrum. Fae creatures are, again, capricious in nature. Whatever motives Pix had, they were spritely and beyond our comprehension. And again, for convenience, I labeled Pix according to the Lawful/Chaotic Good/Evil spectrum as we know it as best as humanly possible; Pix is Chaotic Neutral. Chaotic. Neutral. Not good. Not evil. Chaotic. Neutral.**
If we're gonna call Pix evil because of Fae stuff, then we might as well call Ziggs, Jayce, Fiora and Soraka evil, and Singed, Darius, Warwick, Nocturne and Vel'Koz good.
*Capricious; given to sudden and unaccountable changes of mood or behavior.