One of the animation principles being 'appeal' (I forget which one exactly) I'm sure you'll agree with me when I say it is one of the most important principles. Unfortunately some animators treat it as a side note, or something to-do-later. It can make or break a piece of animation if that audience just doen't connect or relate. The beauty is, when your characters are appealing, the viewer will be captivated.
I hope you find this resource useful. There are a few new ones that I'd not seen before and also some of my favourate animated films/series in there too.
Click the picture or link above to check it out.