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Kallen Stadtfeld, previously part of a small-scare revolutionary group made up of Elevens fighting against the Holy Britannian Empire, is the pilot of the Guren MK2, royal guard to Zero (Lelouch Lamperlouge), and member of the Black Nights. She attends Ashford Academy in disguise as a Britannian student, while she leads a secret life of revolution. Being an ace pilot and loyal subjugate, she is indispensable to Zero.