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Ku Fei is student number twelve in the class. She is an extremely skilled Chinese martial artist, who is very energetic and joyful. She ranks near the bottom of the class, and she has problems studying due to her native language being Chinese, while she is still learning Japanese. Additionally, she becomes very close to Negi, becoming his master in martial arts. She is a previous winner of the martial arts tournament at the academy, so she constantly fights others looking to prove their own strength around campus. In the anime, Ku Fei is the yellow Baka Ranger (know as Dummy Force in English).

Source from Wikipeida