Aeron—Keeper of Wrath
All-Seeing Eye—Godly artifact with the power to see into heaven and hell
Amun—Keeper of Secrets
Anya—(Minor) Goddess of Anarchy
Ashlyn Darrow—Human female with supernatural ability
Baden—Keeper of Distrust (deceased)
Cage of Compulsion—Godly artifact with the power to enslave anyone trapped inside
Cameo—Keeper of Misery; only female warrior
Cloak of Invisibility—Godly artifact with the power to shield its wearer from prying eyes
Cronus—King of the Titans
Danika Ford—Human female, target of the Titans
Dean Stefano—Hunter; right-hand man of Galen
dimOuniak—Pandora's box
Dr. Frederick McIntosh—Vice President of the World Institute of Parapsychology
Dysnomia—Greek, Goddess of Lawlessness
Galen—Keeper of Hope
Gideon—Keeper of Lies
Gilly—Human female, friend of Danika
Ginger Ford—Sister of Danika
Greeks—Former rulers of Olympus, now imprisoned in Tartarus
Hera—Queen of the Greeks
Hunters—Mortal enemies of the Lords of the Underworld
Hydra—Multiheaded serpent with poisonous fangs
Kane—Keeper of Disaster
Legion—Demon minion, friend of Aeron
Lords of the Underworld—Exiled warriors to the Greek gods; now house demons inside them
Lucien—Keeper of Death; leader of the Budapest warriors
Maddox—Keeper of Violence
Mallory Ford—Grandmother of Danika
Pandora—Immortal warrior, once guardian of dimOuniak (deceased)
Paring Rod—Godly artifact, power unknown
Paris—Keeper of Promiscuity
Reyes—Keeper of Pain
Sabin—Keeper of Doubt; leader of the Greek warriors
Sienna Blackstone—Female Hunter
Strider—Keeper of Defeat
Tartarus—Greek, God of Confinement; also the immortal prison on Mount Olympus
Themis—Titan, Goddess of Justice
Tinka Ford—Mother of Danika
Titans—Current rulers of Olympus
Torin—Keeper of Disease
William—Immortal, friend of Anya
Zeus—King of the Greeks