Commonly referred to as Darlington, he is an intelligent and charming student at Yale known for his gentlemanly demeanor. His experiences in hell have left a significant impact on him.

A graduate student at Yale and Lethe's Oculus, responsible for research and maintaining resources. Known for her quiet demeanor, she plays a critical role in the story's arcane research and rituals.

A detective with the New Haven Police Department and Lethe's police liaison. His commitment to justice and protection is evident throughout his role as he navigates complex moral challenges.

Disguised as a lawyer and temporary Lethe liaison, he is a demon prince and antagonist with a history of manipulation and murder.

One of Alex’s roommates, known for her idealistic and adventurous nature. Her view on the magical world contrasts with Alex's more pragmatic approach.

A former member of Skull and Bones who has not yet graduated Yale and is described as personable but clueless. He becomes involved in the group's rituals under dire circumstances.

A vampire connected to the narrative's deeper themes and a minor yet significant antagonist, noted for his connection to a historical ritual attempt.