Johan and Anna Liebert, internal Twins There's plus then just gender that makes them different.
Johan: Hes the one that's the animé is named after, Hes the monster, a cold hearted killer who for some reason still has a soft side for his sister and other kids and a doctor, Who saved his life.Even when hes adult hes still feels the same.
Anna, also called Nina: is a sweet lovable girl, well, not too lovable. She wan't to kill her only family member left that's not dead and still cares for her, Her twin brother Johan, for many reasons one he killed there adopted parents, there real ones abandon them.Also he a dit so, to shoot him in between the eyes . yeah nice family right. i know. X)