Question: "I'm Not that Girl" is a song from the musical "Wicked", sung by Elphaba Thropp, who plays which future character?
Context: Elphaba Thropp is a fictional character in "" by Gregory Maguire, as well as in the Broadway and West End adaptations, "Wicked". Gregory Maguire (born June 9, 1954) is an American novelist.  He is the author of "", "Confessions of an Ugly Stepsister", and several dozen other novels for adults and children.  Many of Maguire's adult novels are inspired by classic children's stories; "Wicked" transforms the Wicked Witch of the West from L. Frank Baum's "The Wonderful Wizard of Oz" and its 1939 film adaptation into the misunderstood green-skinned Elphaba Thropp.  The blockbuster Broadway musical "Wicked", at its height running nine companies simultaneously around the world, was inspired by Maguire's first adult novel.  The musical is the ninth-longest-running play currently staged in London's West End (as of September 2015), and the tenth-longest-running show in Broadway history. Chandra Lee Schwartz (born August 18, 1981) is an American theatre performer, who most recently played Glinda on the First National Tour of "Wicked" from Friday, 21 August 2009, through Sunday, 17 April 2011.  She originally starred alongside Donna Vivino as Elphaba, who was later replaced by Jackie Burns.  Schwartz recently reprised the role of Glinda in the Broadway production of "Wicked" beginning September 27, 2011.  Her final performance was held on October 14, 2012 alongside former national tour co-star, Jackie Burns.  She returned to the role of Glinda on the First National Tour, on July 29, 2014, with Emma Hunton as Elphaba.  She closed the production, alongside Jennifer DiNoia as Elphaba, on March 15, 2015.  Schwartz was recently cast as Annie in the upcoming world premiere of a musical adaptation of "Sleepless in Seattle". Nessarose Thropp is the name of the woman who becomes the Wicked Witch of the East in "" by Gregory Maguire, as well as in the Broadway adaptation, "Wicked".  She is the beautiful and physically handicapped younger sister of Elphaba, the Wicked Witch of the West. "I'm Not that Girl" is a song from the musical "Wicked", based on the novel "" by Gregory Maguire, composed by Stephen Schwartz, originally recorded by Idina Menzel (original song) and Kristin Chenoweth (reprise) on November 10, 2003, and released on December 16, 2003.  It is a solo sung by the main character of the show, Elphaba Thropp (the future Wicked Witch of the West in "The Wonderful Wizard of Oz") in the first act and Glinda in the reprise in the second act. Out of Oz is the fourth and final novel in Gregory Maguire's "The Wicked Years" and was released on November 1, 2011.  "Out of Oz" brings a conclusion to the narratives spread across "The Wicked Years" while providing a revisionist look at L. Frank Baum's Land of Oz incorporating elements from Baum's series as well as the 1939 film adaptation of the original novel.  This novel presents an Oz in the middle of a civil war plagued with depression and adult situations, from the perspective of Rain, the young granddaughter of Elphaba Thropp, Maguire's reimagining of The Wicked Witch of the West. The Wicked Witch of the West is a fictional character created by L. Frank Baum as the most significant antagonist in his classic children's novel "The Wonderful Wizard of Oz" (1900).  In Baum's subsequent "Oz" novels, it is the Nome King who is the principal villain; the Wicked Witch of the West is rarely even referred to again after her death in the first book. Wicked: The Untold Story of the Witches of Oz is a Broadway musical with music and lyrics by Stephen Schwartz and book by Winnie Holzman.  It is based on the 1995 Gregory Maguire novel "", an alternative telling of the 1939 film "The Wizard of Oz" and L. Frank Baum's classic 1900 story, "The Wonderful Wizard of Oz".  The musical is told from the perspective of the witches of the Land of Oz; its plot begins before and continues after Dorothy's arrival in Oz from Kansas, and it includes several references to the 1939 film and Baum's novel.  "Wicked" tells the story of two unlikely friends, Elphaba (the Wicked Witch of the West) and Galinda (whose name later changes to Glinda the Good Witch), who struggle through opposing personalities and viewpoints, rivalry over the same love-interest, reactions to the Wizard's corrupt government and, ultimately, Elphaba's public fall from grace. "Defying Gravity" is the signature song from the musical "Wicked", composed by Stephen Schwartz, originally recorded by Idina Menzel and Kristin Chenoweth on May 10, 2003, and released on December 16, 2003.  It is mostly a solo sung by the main character of the show, Elphaba (the Wicked Witch of the West), with two small duets at the beginning and in the middle of the song between Elphaba and her friend Glinda, and a chorus part in the end in which the citizens of Oz sing.  It was performed on the BBC television programme "I'd Do Anything", and as a result the song charted at no. 60 on the official UK Singles chart. "Dancing Through Life" is a musical number from the hit musical "Wicked".  It is sung between Fiyero, Elphaba (the Wicked Witch of the West) and Glinda, Nessarose (the Wicked Witch of the East), and Boq, as well as other cast members.
Answer: Wicked Witch of the West