Sarah is Ed's spoiled, whiny, selfish, ill-tempered younger sister who acts cute and kind only when it suits her. She is commonly depicted with a disgruntled facial expression and treats her fearful, trembling brother, frightened by his sister's constant threats of tattling on him, with complete disrespect. Domineering, Sarah frequently orders people (sometimes even those of higher rightful authority than her) around, and her desires often have to be met or else she will fling herself into a violent temper tantrum or threaten the person in question. Throughout the course of the series, Sarah has been shown to possess an infatuation with Edd, albeit she still has been shown to frequently subject him to abuse for whatever reason.
Copyright: http://en.wikipedia.org/wiki/List_of_Ed,_Edd_n_Eddy_characters#Sarah
http://ed.wikia.com/wiki/Sarah
