* CompleteMonster: Yolanda. She not only murders Paton's mother by tossing her down a flight of stairs, she also corrupts his sisters into what they are in the series.
** Yorath counts as this as well.
* TheUntwist: Seriously, is there ''anyone'' who didn't guess that [[spoiler: Mr. Pilgrim was Charlie's father]]?
* TheWoobie: Billy Raven has this ''hard''. Each book introduces some new torment that the poor kid has to go through.
* MoralEventHorizon: Each villain has one.
** Manfred Bloor passes this when he hypnotises Emma Tolly and Lyell Bone, making them forget all their memories.
** Yolanda gets this in the third book when she hypnotises Mr Boldova and wipes away all his memories.