Euphemia li Britannia was the Third Princess of the Britannian Imperial Family. Euphemia is Lelouch vi Britannia's half-sister and the sister he cared most about after Nunnally. Euphemia was the Sub-Viceroy of Area 11, a role she admittedly did not enjoy. Euphemia admired her older sister, Cornelia, but despised all combat in general, though was capable of piloting a Knightmare Frame and using a firearm. She’s Zach vi Britannia’s aunt.