Amon is a cold and serious 25-year-old S-class Hunter. He is asked by Zaizen to watch over Robin and he reluctantly does so. After seeing her worth in dealing with highly prominent witches, he accepts her. After an attack on the STN-J headquarters, he is no longer seen working under Zaizen and instead works for the Solomon headquarters. When he is ordered to kill Robin, Amon finds he cannot. Amon's father was a witch and his mother was a seed, indicating he carries the dormant witch trait. He fears the awakening of the gene. His fear and hatred of witches stems from the awakening of his mother as a witch, who no longer recognized him afterward. When Robin accepts her role as the one who will find a way for humans and witches to peacefully coexist, Amon volunteers to be a watchman who will terminate her if she becomes destructive. After the collapse of the Factory, his ultimate fate is unknown. However, the reactions of the other characters show that he is believed to be alive, but is said to be dead for his own safety. He is voiced by Takuma Takewaka in Japanese and Crispin Freeman in English.