Nightmare Fuel / Neverwhere

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• This exchange cements the fact that Croup and Vandemar decidedly aren't human.
  Croup: If you cut us, do we not bleed?
  Vandemar: ... No.
• The duo's habit of eating everything alive. Rats, cats, humans, basically anything with a pulse. At one point, Vandemar finds a sandwich, and instead of eating it, uses it as bait to catch pigeons and eat them whole.
• Croup and Vandermar in general. They may just be two of the most chilling villains in all of Fantasy. They are two completely unhinged, sadistic monsters who positively revel in all the horrid stuff they do and are shown to be practically unstoppable, able to travel across time, teleport with ease and never lose the scent of a person when they have it, meaning there's nowhere you can hide from them. If they decide to go after you, you don't have even the slightest hope of escaping and the best you can get is a quick death and even that's unlikely given their love of horrible torture.
• The whole of Richard's Ordeal, but especially the train carriage full of rotting corpses, every single one a suicide.
• The idea of being permanently unnoticed by everyone around you. You can't withdraw money, your fiancee of 18 months doesn't recognise you, your desk at work's been removed, you can't hail taxis, your house gets sold while you're still living in it...
• Wherever Anaesthesia went (or rather, was taken) on Knightsbridge.
• Mr Croup gleefully eating an object he had doted on with apparent love and affection mere seconds before is so horrifying it borders on Nausea Fuel.
• The Big Bad the Angel Islington is extremely unnerving as a being so utterly self-obsessed and self-righteous it's gone well past the point of insanity.
  • The BBC radio adaptation has it voiced quite terrifyingly by Benedict Cumberbatch, who manages to switch between its Faux Affably Evil and its Voice of the Legion Villainous Breakdown perfectly.
  • The portrayal by Peter Capaldi is just as frightening, especially whenever it shows anger: its face twists back into a near bestial snarl that makes it quite clear it's insane, especially when it screams "They deserved it!"
• The Beast of London is a gigantic, ancient boar that is permanently enraged and far smarter than its mundane cousins. When you consider how dangerous a normal boar was considered to be, having to face this thing on its own territory is truly horrific — to the extent that it kills Hunter, who made a career out of killing such beasts of other cities.
• There are shepherds in Shepherd's Bush. Hunter tells Richard he should pray he never meets them. In the short story, How the Marquis Got His Coat Back we find out why. The shepherds have the power to brainwash people, essentially turning them into drones. The members of the "flock" are used as slave labor, blissfully content as they're worked to death. The Marquis falls under their control for a while and is put to work disassembling the bodies of other flock members who can't work anymore- - taking anything useful like hair and tallow fat — and then dumping their bodies in a pit.

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