Essentially the Gray's Anatomy of Cartoon characters (http://michaelpaulus.com/gallery/character-Skeletons/hello_kitty_closed_rgb_copy)...
Man, I wish I could narrate in my best "Nova"-guy impression:
"The common Potens Tenerum or more commonly known as PowerPuff is a strange creature indeed, though mammalian their slight frames support massive heads...The distinguishing feature of course are the eyes which constitute a full two-thirds of the already massive head. They are prey to other, larger forms of life including monkeys and bears..."