Snow didn't sign when she was with the dwarfs. But now that she's with her prince at the princess meeting spot, she has been. If it changed this year, as Mesaboy said, that would be new.
Not for several years at least. She appears with the Snow Prince in Town Square Theatre, though that will be changing to Princess Fairytale Hall in a few more days.
As stated above, Snow White is not with the Dwarfs at MNSSHP - and a good thing there is no signing. That line gets pretty crazy!
Just off the bat, I know we have met Duffy at the parties and he did not sign at the parties, although typically he otherwise does. Also Lotso doesn't sign.
Tiana and her prince signed, so did the Stepsisters and Lady Tremaine, Tarzan and Jane signed, as did pretty much all of the 'regular' characters; the villains do not - they only pose for a photo if you are lucky enough to get them after the Mix & Mingle
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