Board Thread:General Discussion/@comment-4636650-20161205141818/@comment-4636650-20170123194422

Eskaver wrote:

Hmcooper4 wrote: Agreed. And also avoid the born psychopath, which they used with Cruella. That was fresh with her (and likable in it's own way), but that really is a one-time use.

Honestly, a good reason for the black heart might be conflict between her and Blue, and that conflict drove her to abandon the Fairy morals. Blue did say her heart turned dark, so I think she has an innocent start. Sadly we never did see Cruella's heart but I assume Psychopath/Sociopathic tendencies might arise from a pure dark heart. I think Cruella is probably the only one we know with a pure dark heart (besides Nimue probably). I agree that the Black Fairy most likely had an innocent start, even if (by Fairy Standards) it didn't necessarily last long.

Tbh I'd be more inclined to think that it was Cruella acting on her Psychopathic/Sociopathic tendencies that turned her heart dark rather than being born with a dark heart (with her darkness possibly being amplified when she got covered in the ink); everything we've seen indicates that everyone is born as a blank slate and that it's their actions that determine whether they have a pure heart or a dark heart (with the exception of Lily and Emma thanks to Snow's interference).