Alias: Diablo Cutter Killing Method: Victims die of Fatal Familial Insomnia.Customer Reviews: 100% success rate, but takes about 7-8 months to kill. Often only called for extremely well-defended targets.Description: No one has ever seen Diablo's face; he wears the mask of a blue oni and a black hood. He speaks in a voice that's deep and wheezy, sounding like he's suffering from some kind of severe lung condition. He doesn't speak much, and not much is known about him personally.