OUaT Idea/Theory
The Black Fairy is mentioned in episode 11 of season 3.
She was the most powerful or something like that and the blue fairy banished her and took her wand.
But just because she used dark magic didn't mean she was evil, in the beginning magic was just simply magic, but then it was warped and twisted, and the black fairy though innocent of evil took the fall and was sent away.
OUaT Ideas
Season 4 Alternative
Zelena isn't pregnant with Robins child, Regina is.
There is basically 9-10 (or slightly more? But not by much) weeks between the time before the Shattered Sight Curse, when Robin and Regina were having sex in her vault, and the time when she Arrives in New York to get him away from Zelena. And well they spent quite a while going at it from what I can infer.
Also 9 weeks in only slightly over 2 months, so it's possible that by the time she arrives in New York she could just be getting the first symptoms (morning sickness), and figuring it all out (like I'm pretty sure a woman like Regina would have safe/protected sex, and keep track of her monthlies).
Well now I just found out that Regina took a potion to make her unable to have children, but I'll just make it so that either the potion faded over time, or there could have just been a mistake in the potion and it didn't really work.
Alternative Universe
Emma never leaves Lily at the bus stop, after she gets kicked out of her home in Minnesota.
