- Alternate Character Interpretation: Is Kamiyama a Villain Protagonist, a Sociopathic Hero, an Anti-Hero, and/or Jerk with a Heart of Gold, unless he is not? Is Morino a Broken Bird Emotionless Girl Sugar and Ice Personality or a Femme Fatale Woman in Black playing Death Seeker with a Wounded Gazelle Gambit? How many of these things can they be at the same time?
- Nightmare Fuel: The things most of the criminals encountered do in the stories. Chopping off hands (including those of a baby), murdering people and spreading their organs around, leaving people to die buried underground... wherever the main characters live must be a pretty grim place.