Do Disney Parks try to make the characters authentic like the movie characters?

[DodgerGirl]

My dad asked me at dinner this question and I hope anyone can answer for me and my father? Are Disney Parks characters supposed to be authentic like the movie characters. Because Dad asked me if there was a real Belle or a real Cinderella in Walt Disney World and my dad wanted to know how Walt Disney World designs the characters to be authentic and how they design the princess face characters to be like the movie princesses?

 

[LoveDaisy]

There are lots of former cast members that talk about the process if you do a quick search. Basically they cast people who look like the character. There are height, weight, and look requirements. My friends sister used to play one. Her contract was clear that she could not change her look and maintain her employment.