Markino began as a named Skeleton-rank foot soldier in Hades' army during the Hades arc. His transformation into a Specter occurred 243 years after the last Holy War, triggered by a Skeleton Surplice seeking him out as Athena's seal on the 108 weakened. After swearing loyalty to Hades, he journeyed to the Underworld and was posted as a guard outside the court of Griffon Minos in the First Prison; Minos was absent, leaving Balron René in charge. His duty involved guiding souls to Balron René's court for judgment, enforcing absolute silence due to René's intolerance for noise. This task repeatedly brought him into conflict with Pegasus Seiya and Andromeda Shun, who ignored his warnings against loud talking, sneezing, and other disruptive sounds. Markino visibly panicked when the Bronze Saints broke the rules, terrified of René's reaction, and his frustration mounted as they openly mocked his authority. His attempts to impose order failed, culminating in him shouting at the Saints precisely when René appeared. Reprimanded for the noise and dismissed with a warning that further disruption meant death, Markino later rushed to inform René about Saints infiltrating the First Prison after crossing the Acheron. In his panic, he shouted the news, violating the silence rule again. René ensnared him with a whip, disregarded his desperate pleas for mercy, and executed him by slicing him apart. The character provides comic relief while highlighting Balron René's cruelty and the Underworld's oppressive atmosphere. His anime depiction features a grey Skeleton Surplice and a censored death scene without blood, differing slightly from the manga.