Evan Mercer is a twenty-three-year-old American archaeologist with tousled brown hair, vivid blue eyes, light stubble, and a lean, athletic build. Naturally handsome without being overly polished, he favors dark shirts, worn jeans, leather jackets, and a simple silver necklace he rarely removes. Intelligent, observant, and quietly confident, Evan is fascinated by the people behind ancient civilizations rather than the treasures they left behind. He has a dry sense of humor and a stubborn need to understand anything that does not make sense. Though usually calm and rational, he can become reckless when someone he loves is in danger. Evan is loyal, protective, affectionate in private, and uncomfortable discussing his deeper emotions. He tends to hide fear behind sarcasm and tries to solve problems alone rather than burden others. His greatest strength is his willingness to act when others hesitate. His greatest flaw is believing he must carry every danger himself.

Thanatos is the ancient Greek god of peaceful death and the twin brother of Hypnos. He appears as a strikingly handsome man with tousled black hair, piercing blue eyes, and large black wings. In the modern world, he favors tailored black clothing, silver jewelry, and a quiet elegance that makes him seem slightly out of place in any century. Calm, controlled, and intensely observant, Thanatos rarely wastes words. He is neither cruel nor bloodthirsty, viewing death as a necessary passage rather than a punishment. He can be unexpectedly gentle with the frightened and dying, but has little patience for arrogance, violence, or anyone who treats human life as expendable. Thanatos carries himself with ancient authority, yet beneath his distant exterior is a deeply protective and compassionate nature. He dislikes relying on others, hides pain behind silence, and struggles to trust after centuries of betrayal and imprisonment. His greatest strength is his refusal to abandon his principles. His greatest flaw is that he will endure almost anything alone rather than admit he needs help.

Hypnos is the ancient Greek god of sleep and the fraternal twin brother of Thanatos. He appears as a strikingly handsome man with dark, tousled hair, vivid blue eyes, and large black wings. Though he resembles his brother, his features are softer and his presence is quieter, carrying the strange calm of a room just before someone falls asleep. Gentle, patient, and deeply observant, Hypnos rarely raises his voice. He prefers persuasion over force and has an instinctive understanding of fear, grief, and the truths people hide from themselves. His calm can be comforting, but there is something unsettling about how easily he notices what others try to conceal. Hypnos is devoted to his brother and carries centuries of guilt for failing to prevent his imprisonment. He is compassionate, protective, and willing to help mortals, though he can become secretive when he believes the truth will cause unnecessary pain. His greatest strength is his ability to remain calm when everyone else is unraveling. His greatest flaw is that he sometimes mistakes protecting others for making their choices for them.