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People can become... whatever they want to be.
~ Franz Bonaparta to Nina.)

Klaus Poppe, otherwise known as Franz Bonaparta, is the overarching antagonist of the in the Monster franchise, serving as the overarching of the main story and the posthumous overarching antagonist in the light novel sequel Another Monster, while the overall main antagonist, Johan Liebert, was a disciple of his.

He is a psychologist, psychiatrist, neurosurgeon, and children's book author and illustrator. He is the main catalyst behind the events of the series, from experimenting on innocent children, to causing Johan Liebert's villainy, and instigating the events of Monster.


Bonaparta is a quiet, smooth talking, and intimidating man. He enjoys talking over tea and pastries, he shows to be very interested on the human body and human mind, he is a cold, haughty, and self-assured man.



Far before the events of Monster, in 1930, Franz born as Klaus Poppe, he was a son of Terner and Mrs. Poppe, he was born and raised in the Czech Republic, he would then have a crush on, his father would then find out and take her away, Franz was furious he then confronted him and had brainwashed him, driving him out of town. He would go to school and graduate getting psychology, psychiatry, and neurosurgery degrees

In the 1960s, he joined the Czech Secret Police, where he preformed personality reprogramming experiments. He also began reading at the Red Rose Mansion.


  • While Johan is the main antagonist of the series and the overarching antagonist in the novel, Franz is the true overarching antagonist, since he was far worse than Johan, given by the fact the he is Johan's half-uncle, he also caused Johan's villainy, making him a psychopathic serial killer, and ruining his possible bright future and instigated the events of the series.


          Naoki Urasawa's Villains

Monster/Another Monster
Johan Liebert | Hermann Führ | The Nameless Monster | Franz Bonaparta | Roberto | Christof Sievernich | Michael Müller and Detective Messener | Udo Heinemann | Dr. Oppenheim and Boyer | Gustav Kottman | Hartmann | Peter Jürgens | Peter Čapek | The Baby

Pluto | Dr. Roosevelt

20th Century Boys
Fukubei Hattori (Katsumata)

Billy Bat
Billy Bat