I rather like the first one given that Blue is also known as Ruel Gorem which means Blue Star.
But I also wonder if it has something to do with their morals, ethics, and the way they practice magic. If fairies are supposed to be good and practice Light magic, then when they go Dark, are they no longer considered fairies by the rest of the fairy communitiy?
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"He was a lot of things to me" "The only conclusion was love"