Pollux rui Britannia

Pollux Rui Britannia (パラックス・ルィ・ブリタニア, Parakkusu ru~i Buritania) is a character exclusive to the Nintendo DS video game and a member of the Britannian Imperial Family. His twin brother is Castor Rui Britannia. He pilots the Knightmare Frame, Aquila. Pollux possesses the same Geass ability as his half-brother, Lelouch, though when brought against one another his seems to be inferior. He is frequently mistaken for his brother, much to his annoyance, he possess a pair of golden eyes and a much more mischievous face than his brother.

Trivia

 * Both he and his brother are likely named after the Greek and Roman mythological twin brothers, Castor and Pollux, respectively.