Katurian A writer of gruesome short stories often involving children. His disturbed imagination was the result of having heard his brother being abused when they were younger. Consequently he killed his parents and looked after his brother. He is shocked by his arrest.
Michal Katurian's brother, who is "slow to get things" following his years of abuse at the hands of his parents. He is also taken into jail along with Katurian.
Tupolski The lead detective and the "good cop" in the interrogation. Cold and uncaring, he sees himself as detached from the people he aims to save, shocking his younger partner Ariel.
Ariel A brutal and violent detective who has a vendetta against anyone who commits crimes against children because of abuse in his own past. He ends up being more sympathetic towards Katurian and his stories than Tupolski.
Minor characters include the parents/foster parents, The Little Jesus (girl), and a boy.