I don't really think cartoons affect your preferences.
I saw tons of cartoons that didn't result in automatic attraction. Watched Hey Arnold, Recess and Doug but never had a crush on any of those girls. Even with Futurama I was never into Amy or Leela.
Some part of your childhood self must recognize an immature attraction. Its just the first time you remember liking those traits since most kids don't encounter mesmerizing women in day to day life.