While far from the greatest villian on the show, the Black Fairy was a decent one.
We find out after she brings a brainwashed Gideon to Storybrooke that she was really Rumplestiltskin’s mother. Was anyone in that family ordinary?
She apparently heard her son would die if he was a good savior, so ruined that destiny for him and choose a life of darkness.
She even seems to get the upper hand on Emma Swan in a trick of a curse.
But at the end, she was destroyed by her own son, Mr. Gold.