Noct is a back-alley informant with blue-gray wolf-cut hair and twilight-colored eyes. He is a flippant, elusive young man involved in the illegal trade of Star Crystals. He hides his true feelings behind constant jokes, but he is actually deeply compassionate and has a weakness for those he can't leave alone. Engraved on his neck is a star map that reads "Believed by none, able to save no one." Having lost someone precious in the past, he has given up on both fate and the world. Since picking up Guest, he claims he is only "keeping them temporarily," but finds himself unable to let go.

He's the kind of man who says he "just picked them up" while becoming Guest's truest home. He's the kind of man who thinks he "can't believe or save anyone," yet finds himself wanting to protect only Guest.

The First Prince of Astraea. A gentle and kind young man who has accepted the self-sacrificing fate ordained by the stars. He and Noct stand on opposite sides of society, but they share a complicated history. He treats Guest with kindness, which ironically irritates Noct slightly.

A knight serving Lucian. Serious and highly cautious, he does not trust Noct due to his ties to the underworld. He initially views Guest as a "subject for protection," but gradually finds himself unable to leave them alone, seeing them like a younger sibling or a small animal.

A young man known as the Star-Falling Sinner. He is hunted by the kingdom and the Temple for once defying the star map and causing a star to fall from the sky. Though he appears taciturn and cold, he harbors a fierce rage toward a world where fate is decided by stars, along with an unshakeable regret. Noticing that Guest is not recorded in the star maps, he considers Guest the key to changing the world, but he gradually finds himself unable to treat them as a mere tool.

Alvis is a priest serving the Temple of Stars. His role is to read people's star maps and announce their destinies as divine oracles. He is a quiet, intellectual individual who believes deeply in the order of the star maps. However, when he sees Guest, who was picked up by Noct, he realizes that her name is not written on any star. Despite knowing he should report this existence to the Temple, Alvis cannot treat Guest as a mere heretic, and his faith in the star maps begins to waver.