These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Moral Event Horizon: Camilla sacrifices several of her underlings in the West to feed a newly-risen Avid. She pretty much blames the entire event on Hansen to his face and doesn't even blink when he goes off on little more than a suicide mission to the North.
Nightmare Fuel: Jack, when he's not being awesome can be freaking scary.
Noh-A's backstory. Anyone close to the Mirror Image dies, no exceptions. Usually of natural causes, but occasionally, a big black ''thing'' will do the job. One looked like Jack.
Also, Hansen's backstory. He, his brother Kay and would-be girlfriend Agathe were among the people attacked by a rampaging, newly vampiric Avid. Kay and Agathe are both bitten in trying to save Hansen and rise as bloodthirsty zombies. Which the now traumatized Hansen has to re-kill.