Growing up in Rural Japan, I thought Mulan was based off of Yoshiko Kawashima (Aisin Gioro Xianyu/ AKA: Eastern Jewel)
So She was my favorite "Princess" untill I grew up and realized that there is no way Mulan was anything like Yoshiko... XD And Mulan is not a princess. Her family has high standing, but not royalty.
They had a farm, no servants, etc. Even if she Married Shang, a General's son, it still wouldn't be counted as royalty in China, where it is pretty much blood over everything.
So, though she hardly counts as a princess, Charlotte La Bouff is my favorite.
She is a hilarious spoilt brat and a great friend all in one... I wish I had a friend like her. XD