Like Crane, Caduceus is a homunculus, a fusion of human and incubus DNA. Genetically, he is Crane's half-brother. Unlike his more timid siblings, though, he takes on the very essence of an Incubus in his personality. He's cocky, but with good reason, as he can back up whatever he claims. He is also incredibly promiscuous, and will jump at the chance to release his overactive libido upon any man or woman who will allow it. Thankfully, unlike the Incubi, he doesn't need sex to live, and can suppress his raging hormones to function fairly normally in human society. He escaped shortly after Crane with their sister Papillion, but has retained his memory of the facility they all ran from.

Though he feels most comfortable with normal hand-to-hand combat, Caduceus recognizes the need for weapons when taking on monsters, and so has settled for a pair of spiked boots. One skill he inherited from his Incubus DNA is teleportation. He needs to charge up his energy to go longer distances, but short range teleportation expends almost no energy at all, allowing him nearly unlimited movement range when fighting. He can also call the Incubus as a familiar and has a little bit of curative magic, but not enough to really make him suitable as a cleric.