It would be nice to see our Pirate Queen in some merchandise, especially that she have her 2D-animation look model and it's very pretty!
But adding Emma to line-up it would be hillarious!

Only because I love her and the show so much. Emma/Jennifer Morrison is gorgeous. But I really don't think any of them should be added.

Emma (a show on ABC) and Leia (Disney bought the rights but did not create her or have anything to do with her movie) are not Disney and Elizabeth and Giselle are not Royalty....But Nancy did marry a Prince...so she is a Princess

^Well, I create this poll for fun, and for me any of them should be a DP. But if we are talking about this, then I think that if Disney would like to add Leia to line-up it wouldn't be a problem, if they are create a new Star Wars movie and characters are belongs now to them. And I'm pretty sure that it wouldn't be a problem for Disney to add Emma - I'm pretty sure ABC would like to promote her like this :-).
Elizabeth is from aristocracy and is a Pirate Queen, it's still more royalty than Pocahontas and Mulan, right :D?
But it's not matter, it's all just for fun.

Minus the live action and lack of royal title, Giselle does fit the formula.

I keep hearing a rumor Leia WILL join...

I think she's the only one who could really fit or whose movie is right for the lineup... but Elizabeth would be awesome too

Or Nancy.

She's stronger and more developed as a character than the others, imo

I imagine Leia would be the first. Not Nancy, too minor a character, and not Emma, she´s not even from a movie.

or Princess Mia

And Elizabeth Swann.