Kallen Stadtfeld is a fictional character in the Sunrise anime series Code Geass: Lelouch of the Rebellion. She is legally known by this name, and goes by this name at school, but prefers her mother's maiden surname, using Kallen Kouzuki during her revolutionary activities. Ami Koshimizu won "Best Actress in a Supporting Role" for her role as Kallen at the first Seiyu Awards in 2007. Kallen was awarded 8th place in the 29th Anime Grand Prix, then 17th and 16th, respectively, in the following two.