Board Thread:General Discussion/@comment-25349018-20161209050353/@comment-25375217-20161209051142

It's going to be hard to guess because we don't know her backstory yet. Changelings teased that there's going to be a story there (Blue says no one knows how her heart got darkened) and obviously motivation will give us a better idea of what her goal is.

A theory I've seen that I like is that the Black Fairy was forced to give up her love for Malcolm and Rumplestiltskin by the Blue Fairy like Nova was. A little bit that I've headcanon-ed on to that is that all of the babies she steals are babies that have fairy godmothers as kind of revenge to the fairies for taking her away from her child. Hence Gideon; not only does she get to torture her beloved son, but she gets to humiliate and abuse Blue, too. Win-win!