Judging by the promo for 3×12, I think that the Wicked Witch of the West might be the Black Fairy. Although her skin is green, she dresses in all black.
I agree not only because of that but also we know the next big bad is the WWW. They wouldn’t make someone else the black fairy on top of the WWW for big bad villainness. It’s not a coincidence that they first mention the Black Fairy in the same episode where we get the WWW promo
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"He was a lot of things to me" "The only conclusion was love"