The fallen Greek god of music, light, and prophecy is currently trapped in the body of a 16-year-old mortal teenager named Lester Papadopoulos. Stripped of his divine powers by his father Zeus, he deals with human limitations like fear, cold, and acne. He complains frequently about his mortal state but slowly develops a sense of human empathy and conscience while attempting to rescue hidden oracles.

A 13-year-old demigod daughter of Demeter who possesses powerful control over plants and agriculture. She wears distinctive cat-eye glasses and fights with curved blades. Her difficult childhood under a cruel guardian leaves her stubborn and emotionally guarded, yet remarkably resourceful in combat.

A resurrected, arrogant Roman emperor known as the "New Hercules." He plans to take over Indianapolis, rename it after himself, and host a series of violent gladiatorial games. He loves dramatic presentation, wearing purple robes over a gold racing suit, and treats subordinates and magical creatures as disposable playthings.

A cheerful demigod son of Hephaestus with a talent for building machines and controlling fire. Having grown up in foster care, he uses humor to mask his insecurities. He provides vital mechanical support and transportation for the group's journey.

A former immortal nymph who gave up her magical powers and island exile to enter the mortal world. She deals with the physical limitations of mortal life and occasionally clashes with Apollo, resenting the entitlement of the gods who previously imprisoned her.

A former Hunter of Artemis and minor goddess who gave up her immortality for a regular life. Appearing as a strong, silver-haired woman in her sixties, she co-runs the Waystation—a magical sanctuary for outcasts and mythical creatures in Indianapolis.

A demigod daughter of Hecate and former Hunter of Artemis. She maintains the Waystation alongside Emmie, utilizing her mechanical skills and magical heritage to provide a safe haven for those who do not fit in elsewhere. She has a tough exterior shaped by a past involving organized crime.

Known as the "Cornhusker," he is the demigod son of Demeter and King Midas. He serves as a brutal and highly skilled swordsman for Commodus. Having suffered extreme abuse at the hands of his father, he carries significant trauma.

A helpful ghost residing at the Waystation. Unable to speak due to his lack of a head, he communicates using hand gestures and a rigged Magic 8 Ball, acting as a guide for the sanctuary's guests.

A bitter, dangerous oracle residing in a gloomy cave. Known for driving petitioners mad with nightmarish visions, he harbors immense anger and trauma from his past life as a master architect.

The seven-year-old adopted daughter of Emmie and Josephine. She was abandoned at the Waystation as an infant and recently disappeared after attempting to consult an oracle for advice.

The goddess of nets and traps. She exhibits typical immortal entitlement, demanding that Apollo prioritize rescuing her sacred griffins over finding a missing child.

A massive, magical bronze dragon constructed by Leo Valdez. He serves as loyal transportation and a formidable weapon for Leo and his friends.

A karpos, or grain spirit, deeply bonded to Meg. He is highly aggressive toward anyone who threatens her safety.

A blemmyae—a monster with its face on its chest—working as a mercenary for the Triumvirate. She acts as an enforcer for Commodus in the city, leading attacks against Apollo and his friends.