Johan Liebert

Johan Liebert is the main antagonist in the anime Monster.

Origin
Johan Liebert's origin is shrouded in mystery. When he was just a young boy, he was wandering the border of Germany with his twin sister, Anna. They were both discovered half-starved, and dying. They were taken to two separate orphanages, Anna to Orphanage 47, and Johan to Kinderheim 511. Kinderheim 511 was a horrid place where children were treated like criminals and experimented on in an attempt by the government to create perfect soldiers. One day, Johan led a revolt in the institution, and got fifty people to kill each other by simply "tossing an oil rag into a fire." Johan's mentors had always nurtured Johan's skill for manipulating others with no conscience. However, when confronted, they claimed that Johan was already a "monster" when he first came to the orphanage. The details of how his mind came to be so twisted is still unknown.

Personality
Johan is a sociopath. The only two people he refuses to kill are his sister, Anna, and the doctor that saved his life, Dr. Kenzo Tenma.