Biography:
Kallen is a red-haired girl who is half Japanese and half Britannian.
To most people she is known as Kallen Stadtfeld, a frail girl, who is always missing school
because of her sickness. However, she prefers to go by her Japanese origins, and to a few,
she is known as Kallen Kouzuki, a headstrong terrorist and skilled knightmare pilot. Her
biological mother is Japanese, a maid of Kallen's household, and her father is a Britannian,
who is the head of the household. Although he never appears in the show, it is
revealed that he had an affair with a Japanese woman at one point, and conceived
Kallen in the process.
In season 1, Kallen is invited to join the Student Council by Milly Ashford, who misunderstood Lelouch's
intentions, thinking that Lelouch wanted her to join. Lelouch is one of the few who know about her secret
"double life", and because he is secretly Zero, who leads the terrorists, he stays close by her side
in the academy. She and Kaname Oghi are the first two to trust Zero. Kallen trusts Zero because he saved her
in the Shinjuku ghetto.
Once the Black Knights became well-established and more members joined, she is given the position of
the Zero Squad, which is Zero's personal bodyguard. She is by far the most devoted follower of Zero,
as is shown in her appreciation of being his bodyguard, and upon receiving the Guren for the first
time.
At the end of season 1, she is one of the few to find out that Zero's secret identity is actually
Lelouch, and tries finding him after his memory is wiped. At the beginning of season, Kallen is in a
rescue mission to retrieve Lelouch, and she has her doubts of him. But after he assures her
that she made the right choice, she is relieved and continues being a devoted follower. Kallen
is the pilot of the Guren MK II, one of advanced knightmares given to the Black Knights.
With the Guren and her pilotting abilities, she is able to be Suzaku's equal on the battlefield.
Spoiler:
When the Black Knights betrayed Zero, she still believes in him, until he calls her a pawn,
at which point, she betrayed Zero. She never forgave him until after his death, and that is when
she realized what he was doing, to make himself the symbol of hatred, and sacrificing himself to
expunge the hatred of the world unto him. Two months after Emperor Lelouch's death, Kallen is
seen going to Ashford Academy as her true self, not the frail, weak girl, but with her
preferred hairstyle, and wearing the Guren key around her neck.
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