Board Thread:Spoilers!/@comment-27060727-20160929050506/@comment-25375217-20161121205235

Actually. based on it being a Rumbelle episode, they could possibly be working the Black Fairy into that role in Beauty and the Beast. She is apparently the reason that Rumple hates fairies after all.

Besides that, I'm not sure. There are fairy stereotypes from other countries that tend to be evil (including one Welsh fairy that does Changelings) but there are not a lot of references to evil fairy characters.