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Cornelia li Britannia (コーネリア・リ・ブリタニア)Age: 27 (first season), 28 (second season)
Date of Birth January 13, 1990 a.t.b. (Capricorn)
Blood Type: O
Height: 180 cm (5'11")
Occupation: Military Officer, Knightmare Pilot, Princess, Commander
Allegiance: Holy Britannian Empire
Position: Chief General of the Imperial Army
Knightmare: Cornelia's Gloucester, Akatsuki, Quinn Roses Model-Z
Cornelia li Britannia (コーネリア・リ・ブリタニア, Kōneria RI Buritania), is the second princess of the Britannian Imperial Family and is Lelouch's half-sister. She serves as one of the main antagonists during the first season but later becomes a neutral character during the second.
Cornelia displays an incredibly cold-blooded exterior, dismissing anyone she feels is opposing Britannia. She constantly refuses to accept change. Nonetheless, she deeply cares for the lives of her soldiers, especially her Knight Guilford.
At the beginning of the series, Cornelia had an unrivaled sense of patriotism as she took pride in her epithet as Britannia's "Goddess of Victory." However, after the Black Rebellion, she changed her views about her nation and would go as far as to betray it for the people she loves.
While initially one who would sacrifice as many lives needed to achieve needed goals, Cornelia later shows signs of change. She takes more value in human life, and that status quo isn't worth everything.
(Source: Code Geass Wiki)