King Gaius was the greatest king of humankind who succeeded in bringing humankind to its golden age. His strong figure and expertise in battle, as well as his humble nature made him highly respected by his people. King Gaius has short blond hair and carries a spear as his weapon. His wisdom and kindness make not only humans respect him, but also Ajin, Demon, Elf, and the sworn enemy of humanity, vampires, respect King Gaius.