Smarty Pants is your normal, unpopular, geeky schoolfilly.
She has no friends whatsoever.
She's avoided by some and targeted by most, all because of one mistake she made as a foal, and her unique appearance.
Smarty Pants is only based off the doll. She is not really related to it in any way; just the title and appearance.
*Throws hooves around cover art* My...precious...