Loren is a mortal young woman living in Angelthene, a city dominated by powerful immortals. She works at a local apothecary and attends Angelthene Academy. Plagued by blood sugar crashes that leave her physically vulnerable, she struggles with feeling like a second-class citizen in a society that devalues her short lifespan. She relies on her deep empathy and stubborn moral conviction to survive her dangerous surroundings.

Darien is a pure-blooded hellseher and the highly feared leader of the Seven Devils, an elite Darkslaying group. He uses his magical Sight to track auras for high-paying bounties and fights in underground arenas to manage his intense emotions. He projects a stoic, volatile exterior to hide his deep-seated self-loathing, but adheres strictly to a personal moral code regarding who deserves to be hunted.

Dallas is a talented witch and Loren's adoptive sister. She is training to join the Aerial Fleet, following in the footsteps of her highly successful military parents. Outgoing and flirtatious, she benefits from her parents' clear favoritism but remains fiercely loyal to Loren, frequently using her magic to defend her mortal sister from supernatural threats.

Randal is the tyrannical leader of the city's Darkslaying circles and the abusive father of Darien and Ivyana. He suffers from the Tricking, a degenerative magical disease caused by the overuse of power, which drives his ruthless search for the legendary Arcanum Well. He rules his subordinates through fear, violence, and unbreakable magical covenants.

Calanthe is the powerful and charismatic leader of Angelthene's vampires. She operates heavily in the city's political sphere, maintaining a sophisticated public image. When mysterious abductions threaten the supernatural balance, she positions herself as a strategic ally to the werewolves and Darkslayers, though her long lifespan makes her true political ambitions difficult to read.

Ivyana, commonly called Ivy, is a hellseher, a member of the Seven Devils, and Darien's twin sister. She shares her brother's traumatic past but acts as a warmer, more emotionally accessible counterpart to his stoicism. She warmly welcomes Loren to Hell's Gate and frequently scolds Darien for his emotional obliviousness.

Sabrine is a half-witch and a close friend of Loren and Dallas. Like Loren, she occupies a vulnerable position in Angelthene's social hierarchy due to her mixed heritage and lack of financial resources. Her sudden kidnapping by unknown assailants serves as the catalyst for the central investigation.

Maximus, or Max, is a hellseher and a key member of the Seven Devils. Unlike some of his more hostile peers, he immediately treats Loren with hospitality and kindness. He provides a stabilizing, good-humored presence in the heavily fortified Darkslayer compound.

Logan is a prominent leader among the werewolves, having assumed pack authority after his father's death. He is deeply invested in finding his missing teenage sister, Chrysantha. His grief and desperation force him to navigate uneasy alliances with rival supernatural factions, including vampires and Darkslayers.

Taega is a high-ranking commander in the Angelthene Aerial Fleet, Dallas's biological mother, and Loren's adoptive mother. She maintains a wealthy, opulent lifestyle and a strict military mindset. She treats Loren with noticeable coldness, heavily favoring Dallas.

Roark is Taega's husband and the adoptive father of Loren. Highly religious, he accepted a priest's suggestion to adopt the abandoned baby years ago, though he remains largely distant from Loren's daily life.

Arthur is an elderly human doctor and weapons designer who works on military contracts. He serves as a trusted medical contact and researcher for Darien, offering historical knowledge and technological aid that bridge the gap between mortal science and immortal magic.

Tanner is a hellseher and member of the Seven Devils. He specializes in technological and magical hacking, frequently bypassing wards, security systems, and communication grids to aid the group's tracking missions.

Lace is a female hellseher and a fierce combatant in the Seven Devils. She is highly protective of her found family and deeply skeptical of outsiders, making her initially antagonistic toward Loren's presence in their home.

Travis is a quiet, physically imposing hellseher and member of the Seven Devils. He rarely speaks but acts as reliable muscle for the group's interrogations and combat operations.

Jack is a hellseher and member of the Seven Devils. He participates in the group's investigations, stakeouts, and combat missions throughout Angelthene.

Widely known as the Butcher, Casen is the lead dealer of illegal Blood Potions in Angelthene's underworld. He runs a heavily guarded operation and forces information-seekers to participate in violent arena fights as payment for his secrets.

Benjamin is the leader of a grave-robbing ring operating out of Angelthene's oldest cemeteries. He occasionally takes on tracking bounties but operates by a strict personal code, refusing to harm innocent mortals.

Chrysantha is a teenage werewolf whose sudden disappearance from a local dive bar mirrors Sabrine's abduction. Her disappearance draws the werewolf packs into the broader citywide investigation concerning illegal Blood Potions.

Langdon runs the prestigious Angelthene Academy. He enforces strict rules regarding restricted areas on campus and oversees the education of both mortal and immortal students, though he hides personal desperation behind his academic authority.

Cain is a criminal operator residing in Stone's End who creates illegal and highly dangerous Blood Potions. He professes loyalty to the Darkslayer leadership but frequently acts in his own self-interest, bringing him into direct conflict with Darien.

Dr. Atlas is a physician who treats humans and immortals alike. She manages the excruciating maintenance of human health-monitoring tattoos and regularly observes the rising cases of the Tricking sweeping through the immortal population.