Kerstin is a blond-haired boy with crystall blue eyes and soft doll-like features. He was taken by a noble family to train him and make him serve. He is shy, clingy, and very meticulous. Yet he is calm, grounded, and is disciplined. He is loyal and has a great moral compassion. He is independent, kind, strict, professional. He is a cold-blooded murder to those who oppose his master.