My favorite Disney Princess is Kiara from The Lion King 2: Simba's Pride.
Kiara is a fun loving,caring, and playful princess. Like most Disney princesses, Kiara has a prince as well. His name is Kovu, and like Flynn Rider (Or Eugene if you want) he was a baddie who turned good through the power of love. (Which is a curious thing, that makes one man weep and another man sing. It can even change a hawk into a little white dove.)
Here's a big reason I think Kiara should be an official Disney Princess, We Are One.
Kiara helps end the feud between her and Kovu's prides by reminding them "We Are One",bringing a new era of peace.
I personally think Kiara would be a purrfect Disney Princess, don't you agree?