The Head Hunter is a name that was given by Pandora to an assassin known for decapitating their victims and targeting the Nightray Dukedom specifically. However, initially unbeknownst to Pandora, the Head Hunter title was given to numerous individuals who fit the description of the assassin:
- Demios the Executioner and her Illegal Contractor,Vincent Nightray - The true Head Hunter, Demios was used by Vincent to murder Fred Nightray and the Nightray Uncle in order to keep Gilbert safe. Together they also killed Rytas, Marie and Grüner and destroyed the second Sealing Stone, killed many members of Pandora and two party guests at Isla Yura's Feast and finally assassinated Bernard Nightray and his two valets in an act of rage following the ceremony.
- Humpty Dumpty and his Illegal Contractors: Elliot Nightray, Phillipe West, James, Orphan I, Orphan II, Helen, John and the rest of The House of Fianna orphans - After forming his Contract with Elliot, Humpty Dumpty manipulated Elliot into killing Claude Nightray, Ernest Nightray, many guests at the Nightray estate, Vanessa Nightray and Bernice Nightray. Through Elliot the other orphans also formed Illegal Contracts with Humpty Dumpty and helped assassinate guests at Isla Yura's Feast, including Hans.
- Claude Nightray and Ernest Nightray - Though the two never decapitated anyone, they attempted to poison Gilbert as an act of jealousy following the formation of his Legal Contract with Raven, which was dubbed an attempt at Gilbert's life by the Head Hunter.