Nightmare Fuel / Busou Renkin

  • The Hayasaka twins' backstory is fairly disturbing. It involves a woman who kidnapped them, and kept them hidden until she died of starvation, leaving them to die alone with a rotting corpse. Yeesh!
  • The Homunculi, even the humanoid ones, all have scary, warped faces at one point.
  • The Karneval type Homunculi, which resemble white bipedal, multi-eyed monstrosities instead of actual humans.