Lelouch Lamperouge's half-sister and the Third Princess of the Holy Britannia Empire, Euphemia li Britannia is a kindhearted and open-minded woman who despises conflict of any form. She joins her older sister, Conelia, in governing Area 11, thus becoming the Sub-Viceroy. She develops a relationship with Kururugi Suzaku as they share the same views, and eventually appoints him as her personal knight.