Zeru

Zeru is a central and morally complex figure in Elly Blake's Thirstwood series — described as a "demon boy" or Dracu, he is Cassia's childhood friend whose relationship with her transforms into something far more complicated and painful as the story progresses. The intimacy of their shared history makes his role as her captor particularly devastating, creating the kind of betrayal that cuts deeper than any stranger's cruelty could.

Zeru's character embodies the series' interest in the intersection of supernatural nature and personal choice — the question of whether his actions are driven by what he is or who he has chosen to become. His complicated feelings for Cassia run beneath the surface of their antagonistic dynamic, giving the series its central emotional tension and its most morally ambiguous relationship.