Board Thread:Spoilers!/@comment-4877635-20140915180352/@comment-1916997-20140920191721

Okay, a couple points here:

1. Anastasia from Wonderland is almost certainly one of the step sister's from Cinderella. A list of reasons, off the top of my head: she shares the name with the Disney stepsister and wears a pink dress, and we know Once heavily uses the Disney versions of characters; she has a very Lady Tremaine like mother, who cares only about status, and how her daughters can not acheive it; she has an "ugly" side as the Red Queen; and Ashley (Cinderella) makes a cameo in the first episode, out of all the characters that could have cameo'd they specifically wanted Ashley, why? Because it was a super subtle nod to the fact that her stepsister was a main character. As for why the writers couldn't confirm it, it's because they obviously want to wait until they are ready to commit a whole episode to Cinderella/ugly stepsister backstory, which may take a few seasons (needs to fit in to the plot and need the actors to be avalible.).

2. Because they go so heavily off the Disney versions of the stories, when we do see the other stepsister, her name will have to be Drizella. Sorry Edward, and anyone else who dislikes that name. She will also be wearing green.

3. I also thought of Cinderella when reading the character's description, but based on the character description of the arrogant prince, the fact that Cinderella plot would seem really forced in the middle of a Frozen arc, and that the episode is called "The Snow Queen", this character is almost certainly for the Snow Queen's backstory.