Kallen Stadtfeld is one of the main protagonists in the anime series Code Geass: Hangyaku no Lelouch. She is a skilled pilot and a prominent member of the Black Knights, fighting under the codename Q-1. Kallen is known for piloting the customized Knightmare Frame RPI-11 Glasgow, often referred to as the Kallen custom. Her character embodies determination and loyalty, and she plays a pivotal role in the resistance against Britannia, balancing her dual identity as both a Britannian student and a Japanese revolutionary.