Kallen Stadtfeld (Kozuki)

Kallen is a half Japanese, half Britannian girl enrolled in Ashford Academy. She is of the Stadtfeld family which means, according to Rivalz, she is "well bred and rolling in money". At Ashford, she portrays a sickly girl; as such, she rarely attends school. Despite this, Kallen's grades are at the top of her class. She is also the newest member of the student council.

But the Kallen of Ashford Academy is a fake. She prefers the name Kallen Kozuki over Stadtfeld because she considers herself Japanese. She lives a second life as a member of a resistance group and then as a member of the Black Knights piloting the Guren Mk. II. Kallen is brave and strong willed; she is the most loyal of Zero's followers.