Kiefer, with red hair and eyes, is described as a young woman who is both pretty and slender. Although she's shorter than Ferris, she's still quite attractive. In "The Legend of the Great Heroes of Legend," she first appeared with short hair but later grew her locks to shoulder length after three years of meeting Sion and Ryner at the Roland Royal Special Military Academy. Despite appearing shy, Kiefer is confident in her feelings and has a compassionate nature. She's also known for being intelligent and skilled in magic compared to most mages.
While pretending to work as a spy for Estabul and infiltrating the Roland Royal Special Military Academy, she is in fact a double agent working for Roland, and as such is versed in both Estabul and Roland magic. (Source: Wikipedia)
Kiefer is of Estabul origins, and at the age of fourteen, after Estabul had already become a vassal country of Roland, she witnessed the death of her elder sister under the hands of Roland's mage knights during the rule of the former tyrannical King of Roland, while her elder sister tried to protect Kiefer and her younger sister. In order to save her younger sister, the last of her remaining family, she agreed to become a spy for Roland while her younger sister was taken hostage.