Age: 16

Date of Birth: October 11, 2000 a.t.b. (Libra)

Blood Type: B

Nationality: Britannian

Height: 175 cm (5'9")

Occupation: Politician, Princess

Allegiance: Holy Britannian Empire

Position: Sub-Viceroy of Area 11

Knightmare: Portman, Gloucester (only one episode for both)

Euphemia li Britannia (ユーフェミア・リ・ブリタニア, Yūfemia RI Buritania) 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 she could pilot a Knightmare Frame.

Although Euphemia is a member of the Britannian royal family, she remains kind-hearted and open-minded to everyone around her. She treats everyone with respect, even if they are not Britannian. This universal respect probably stems from her childhood experiences with her siblings Lelouch vi Britannia and Nunnally vi Britannia.

She is the second person in the Imperial Family to discover that Lelouch is alive. The first to know his alter ego is Zero, having deduced it after the hotel hijacking incident. In her childhood, she was pretty close to Lelouch and Nunnally. She develops a close, romantic bond with Suzaku Kururugi because of their shared the same belief.

First Season: