Hercules Tres Iqus (トレス・イクス), designated as HC-IIIX and commonly known as Tres Iqus, is one of ten HC Series "Killing Doll" mechanical soldiers created by Vatican scientist Professor Gepetto Garibaldi. He is a cyborg; a machine with the exception of his brain and brainstem, both of which are organic. Iqus is an agent of the Vatican Ministry of Holy Affairs AX division. His codename as an AX operative is "Gunslinger."