The Wicked Witch of the East is a fictional character created by American author L. Frank Baum. She is a crucial character but appears only briefly in Baum's classic children's series of Oz novels, most notably The Wonderful Wizard of Oz.
There are roughly one-sh*t billion tropes so PLEASE look through them before adding one. Otherwise add what you like. ADDITION: PLEASE read through the trope description provided before submitting something. It's not a huge deal but too often people submit characters that don't fit just because they misinterpreted the title...