Čapek, Peter

The last individual of the organization is the mysterious man with glasses who is responsible for a large amount of incidents during Monster. He is the highest in the organization, and tried to control the devil by letting him meet with Christoph Sievernich.

[Spoiler] In his youth Peter was actually Franz Bonaparta's apprentice who took part in the experiment on the Liebert twins. Peter thinks that everything is going the right way according to his plan, but Johan tells him clearly later that everything is going the right way according to his own plan. In his paranoia he kills his bodyguard when he goes for his lighter thinking he was trying to kill him, in retribution Čapek is executed by his other bodyguards. He first appeared in chapter 121, but his face isn't shown until the end of chapter 123. He was a childhood friend with Milan Kolacsh. Peter killed the loved ones that live with Milan and he tried to kill Peter at the convention but police shot Milan before he was able to take revenge. [/Spoiler]

Source: Wikipedia