Being different doesn't make you a misfit -- just unique and gifted in your own way. Also, relationships between young people and their elderly relatives can be beautiful and character shaping. Themes include courage, curiosity, and integrity.
Very creepy tone throughout; many scenes have a sense of menace and foreboding. Opening sequence is quite scary, with a deadly attack and a boy fleeing through the woods. The main character loses a family member. The battle scenes between the Peculiars and the Hollows (who subsist on eating Peculiars and other beings) are pretty brutal, if light on blood. They use explosives, arrows, and anything lying around to fight each other. In one scene, characters eat eyeballs. A dead, bloodied man is shown lying on the ground, seemingly having been attacked by an otherworldly being. Talk of a dead child, his body lying in a room; like others who die in the movie, his eyes are hollowed out. One scene briefly suggests that a Peculiar may have been killed.
Romance between two of the Peculiars. Flirting and hand-holding.
Infrequent use of swearing, including "crap," "goddamn," "hell," and "bollocks."