He is known for his cold and ruthless personality, and his peculiar collection of members of enemies' bodies that he defeated is a reflection of his psychopathic nature and his obsession with control and power. He collects parts of the enemies' bodies as a way to score their victories and demonstrate that he has absolute control over them, as if each piece were a personal trophy.
This behavior is closely linked to his disturbed psychology, which manifests itself in the need to affirm his Superio