* {{Anvilicious}}: Environmentalism in spades. Especially speaks out against bottom-trawling, and the devastation of the rainforest.
* ClicheStorm: It's relatively little what you can find in ''Caretaker'' that you have never seen or read in similar science-fiction young adult literature. Sometimes, like the aptly but quite unoriginally named Dark Army and Dark Lord, it looks like TheyJustDidntCare.
* CompleteMonster: The Dark Lord (obviously).
* EnsembleDarkhorse: Gisco.
* EvilIsSexy: Reilly.
* WhatDoYouMeanItsForKids: The trilogy is marketed as juvenile literature and even below in some countries, despite containing some very graphic sexual overtones.