we were wondering if it was only Disney characters the kids could dress up as.
Though if you take away the Disney magic and investigate some of the stories that those characters appear in, I'm quite sure they'd be against it.

Sleeping Beauty(aka Briar Rose) is in a story about a Prince finding her asleep and knocking her up while she was still sleeping.
Ariel, the little mermaid, actually had her tounge cut out when she gave up her voice.
Snow White had 3 murder attempts on her.(Well, 4 if you count the part with the hunter in the beginning) Lovely.
Little more graphic when you start investigating certain tale types.

However, with Disney those songs seem to make everything more tame.
~Zoo