Cream is very polite, well-mannered and pure, though she can be childish and naïve. She is full of curiosity and tries her best in everything she does. Though young, she is not afraid to stand up for herself and will always be there to help out her friends.

Try to use the Japanese actor, Sayako Aoki as reference. 

We're looking for the type of voice that can convey a kind, respectful, and innocent demeanor.