Lazlo is a 20-year-old librarian at the Great Library of Zosma. Given the surname "Strange" as an orphan foundling, he feels disconnected from his scholarly surroundings and finds solace in reading fairy tales. He possesses a lifelong obsession with the lost city of Weep, spending his days collecting obscure lore and secretly helping others with his academic discoveries. He eventually joins a delegation to travel to the mythical city.

Sarai is a 17-year-old blue-skinned girl living in secrecy above Weep. She has the magical ability to disperse her consciousness into a flock of moths, which allows her to enter the dreams of sleeping humans. Though labeled the Muse of Nightmares, she questions her forced role. Experiencing human fears every night builds a deep sympathy within her for the citizens below.

Minya is an older godspawn who maintains the physical appearance of a six-year-old child. She is the only survivor old enough to remember the human massacre of her people. She holds a vicious hatred for the citizens of Weep and strictly commands her siblings to pursue vengeance. She uses her magical ability to bind the spirits of the dead to enforce her will.

Eril-Fane is the revered leader of Weep, known to his people as the Godslayer. He organizes a delegation of scholars to solve a massive problem plaguing his city. He projects a stoic and traditionally heroic exterior, but underneath his public persona, he carries severe emotional scars from his past enslavement to the gods.

Azareen is a disciplined warrior and the second-in-command of the Tizerkane. She carries a profound sense of grief resulting from her past abduction by the gods. She remains deeply loyal to Eril-Fane and maintains a supportive but painful distance from him while helping to lead the expedition.

Thyon is a highly privileged alchemist in the Kingdom of Zosma. He faces intense pressure from his abusive father to discover the chemical secret of distilling gold. He views Lazlo with suspicion while simultaneously relying on his extensive academic records to boost his own reputation.

Sparrow is one of the surviving blue-skinned godspawn hiding above Weep. She has a gentle nature and the magical ability to coax seeds into rapid growth. She provides the necessary sustenance that keeps her hidden family alive in the isolated citadel.

Ruby is a passionate and volatile godspawn survivor. She has the magical ability to burst into flames at will. She holds a cynical view of their survival prospects and openly envies the normal lives of the humans living below.

Feral is the sole male among the surviving godspawn children in the citadel. He possesses the magical ability to manipulate the weather based on his emotional state. He shares his siblings' curiosity regarding human life outside their sanctuary.

Isagol is the dead goddess of despair who terrorized the citizens of Weep before the Carnage. She was a cruel deity who kidnapped humans for her own pleasure. Her legacy casts a heavy shadow over her daughter and her surviving human victims.

Skathis is a dead god known for his terrifying ability to shape and control the magical metal mesarthium. He used his powers to create massive metallic beasts and subjugate the human citizens of Weep.

Drave is an ambitious demolitions expert recruited for the journey to Weep. He seeks personal glory and views the mission primarily as an opportunity to demonstrate his destructive skills.

Brother Cyrus is an elderly monk at the abbey where Lazlo is raised. He entertains the young orphan with fantastical tales of a lost mythic city paved with lapis lazuli.

Wraith is a mysterious white eagle that seems to exist independently of humans and gods. The creature provides the magical seeds that allow the hidden godspawn children to grow their food.