[Book 2] A teenager repeatedly lashes out by accusing adult characters of being pedophiles. The teenager is not sexualized or assaulted, and there are no pedophiles in this arc.
A teenager accuses adults of creeping on her when upset, but it's clear she's just lashing out and none of the characters have actually hurt her. The narrative doesn't sexualize her in these instances either.
In one comic, a mother dog brings her only surviving puppy to the Monster Hunter; it becomes clear that the puppy manifested the monster due to fear of abuse from its owner. Both dogs are shown as sad, but they have a happy ending.
[Book 2] A character cuts their palm with a knife, drawing blood. While it's for monster-luring purposes, dialog suggests it's also an act of self harm.
Book 1 is bittersweet at best, with the town safe at the cost of several characters' lives or well-beings. Book 2 is rougher; the monster is killed and Erika survives, but the child she was trying to protect dies.
One character who dies in this series is revealed to be gay in the spinoff, "House of Slaughter." There are other gay characters in this series who survive (a young gay boy and a middle-aged lesbian are main ones).
Pretty much all of the monster-hunters are orphans. We see Erica's parents get killed by a monster onscreen; in "House of Slaughter," we see Edwin's mother die as well.
A lot of characters self-sacrifice. Some major instances involve a man taking responsibility for multiple murders in order to save the lives of many innocents, and a teenager letting herself be eaten by a monster so that it will be poisoned by her blood and die.
One teen is from a very religious family, though she herself isn't religious and often curses out God. As this character dies, she says she wants to apologize to her dead grandmother for being mean to God.
Sort-of. Monsters born of a fear of ghosts can take on the qualities of a stereotypical ghost (possession, hauntings) but aren't actually the soul of a dead person.
A tale is told about a dragon dying, but nothing is visually depicted. Dragons are considered malicious monsters in the setting's lore, with monster hunters sent to kill them.
The monster hunters seal some monsters away inside of children's toys. The toys are not destroyed, but the kids generally treat the toys as terrible monsters going forward, so it could be triggering in similar ways.