Board Thread:Character Discussion/@comment-5679696-20161008012502/@comment-25375217-20161008020058

I think the Spell of Shattered Sight is a good place to start for evil selves. The Evil Queen is very similar in both.

So that would mean that Hyde!Snow would be unremorseful about her past deeds and snarky... Hyde!Henry would be a moody teenager...

The way Jekyll describes it, though, is that it's how the user sees their evil self. Regina has always imagined the inner darkness as being "the Evil Queen" - it would be possible that Snow sees hers as something more like Hyde, who has very few similarities to herself. Going by this, Snow's might just be a giant black blob - she's always seen her inner darkness as that black spot on her heart.