What are Disney's Mulan face character requirements?

I am aware that you must be versatile to be casted as a character. I am hoping to get Mulan, Pocahontas, and Silvermist. I'm mostly Asian but slightly mixed with European. I was wondering what requirements there were to be casted. I'm 5'4" but only 103 lbs (someone said that you have to meet even a size requirement?!). I'm not sure if there are any other characters I'd be able to play considering my ethnicity. Also, if any retired faces of Disney could tell me how the auditions are? And any tips on how to stand out?