(Jumps onto personal soapbox)....
My daughter is an animator. For her Master's thesis, she designed two female protagonists and set them in a "Space Opera". They were definitely idealized characters in terms of body size but their characters are strong, fearless and clever. She has participated in a number of panels on women in animation and this subject does come up. Essentially, if a young girl cannot identify with the personality of the character, the character will not "sell". Girls and women want to identify with these characteristics regardless of their body size. They want strong role models. Remember, women animators are few and far between and it is very new. Who knows what changes will come as a result.
That said...
A cartoon is a cartoon. Think of a characature of yourself, does it have to look like you to capture "you"? My daughter has animated herself in numerous iterations. The marketable ones are superhero style in the Marvel and Disney traditions. I love them! However, she does have some cute graphic novel style versions that show her as a crooked little girl. You see, she had severe scoliosis until last winter when she had titanium rods put in her back. Does anyone want to buy those characters? Not so far, but I'm convincing her to do a series of patient information pamphlets for young people facing scoliosis surgery.
The brothers Grimm and Hans Christian Andersen did not write stories about princesses who were not idealistically beautiful so those stories should not be illustrated any other way. Our role models are those we admire and aspire to be like. It's time we give up the notion that appearance should be our aspiration.
In Martin Luther King's "Dream Speech", he had a dream that his four children would not be judged by the color of their skin but the content of their character. Why not apply the same dream to the body mass index of our children? It goes both ways, no cute, little girl with perfectly smooth curls wants to be judged solely on her appearance either.
Off soap box now...