Mary Sue

Mary Sue or Mary Sioux is one of the main antagonists of the series. She is the sole daughter of Anson Sue and his wife, who hail from the Unified States. In the anime, Mary is a young girl with long brown hair with curled ends and green eyes. When she was still an ordinary citizen, she was seen wearing a blouse with a long skirt. In the light novel, she has straight and long brown hair, and her eyes were greenish blue. As a volunteered soldier, she is seen wearing a US military uniform. When she was a citizen, she was a caring and loving girl. She loved her father very much. After her father's death, she became rather more vengeful and serious. Her hatred grows whenever she hears the name "Devil of the Rhine", and she will begin to rage, resulting in her exposing herself in an out-of-control state.