Butt monkey?

She's the youngest and she always nice, the other princesses could easily gang up on her. She(and Cinderella) kind of already are butt monkeys when you think about it. For those who aren't clear, click the links.
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Butt monkey as in butt-kisser.
Snow White sees good in everyone and even when the biggest evil comes, she always points out the positive. Cinderella doesn't try that hard, she's got hope but she doesn't know what to say at the right time like Snow White does. (like the time she tried to find out good things about Lucifer...not the devil- the CAT)

Maybe it would be more clear if you typed in 'butt KISSER' ? :)

"The character who is always the butt of the demeaning joke or the "put him through hell" plot line. For whatever reason, the Butt Monkey seems to walk through life with a permanent "Kick Me" sign attached to their backs, invisible to them, but all too visible to the rest of the world. Nothing ever goes right for this character, and if something bad is going to happen to someone, chances are it's going to happen to them. Long story short, it sucks to be the Butt Monkey."

The above quote is taken from the one link that was posted explaining what a monkey butt is. I don't think any of them are monkey butts but if you meant something like the kiss up, someone who everyone can gang up on, and who can always be picked on for their outlook or personality I would agree Snow White would probably be the one. Her positive outlook, bubbly personality, and never think bad about anyone thing would definitely get her picked on from the rest of the girls, lovingly of course.

Or Snow. But she seems the type that would fluff someone's personality up if you mean butt kisser. The person who would get "picked on," well none of them. The DP's aren't like that.

Butt monkey sounds like some sort of slang for a sexual fiend.