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Euphemia li Britannia , 16 years old, is the Third Princess of the Britannian Imperial Family, Euphemia is Lelouch Lamperouge's half-sister and the sister he cares most about after Nunnally. Euphemia is the Sub-Viceroy of Area 11, a role she admittedly does not enjoy. Euphemia admires her older sister, Cornelia, but despises all combat in general, though is capable of piloting a Knightmare Frame, as seen in the battle at the Empire's Shikine Island Base.

Source from Wikipeida