Kallen (it can also be pronounced Karen) is one of the leading female characters in the anime Code Geass. A red haired, blue eyed, beautiful and just maybe the perfect girl for most guys in the world. She is a member of the Red Knights organization with Zero as leader. Kallen leads a battle filled life. During the day she is a student in an elite british school, and during the night she is a rebel fighting for the independence of Japan. Kallen is half Japanese and half British. She is sympathetic to Zero and even becomes his personal bodyguard in his fights. For her he is a leader and she thinks he is the person which will save Japan from the shackles of its oppressor. She pilots a robot like machine called Guran Mk-II. Guran has many abilities and with her Kallen manages to fight on an equal level with Lancelot piloted by Suzaku. The thing about Kallen is that in the anime she is depicted in many erotic and sexy situations or also know as fan-service situations.
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