Nessarose Thropp, also known as the Wicked Witch of the East, is a supporting antagonist in the 1995 fanatsy novel Wicked: The Life and Times of the Wicked Witch of the West by Gregory Maguire and it's musical adapation of the same name, which details the life of the Wicked Witch of the West from L. Frank Baum's 1900 children's novel The Wonderful Wizard of Oz and the 1939 MGM film adaption starring Judy Garland.
Nessarose is the spoiled younger sister of Elphaba, the "Wicked Witch of the West". In the novel, Elphaba is considered a tomboy second to her very beautiful and attractive, but delicately handicapped younger sister, and is often expected to put the needs of Nessarose before her own.