Skeletons (雑兵スケルトン Zōhyō Sukeruton) are the lowest ranking soldiers of Hades' army, the equivalents of Athena's rankless soldiers. Unlike them, the Skeletons wear weak versions of Surplices and are often armed with sickles, as they have no mastery over Cosmo.
Skeleton Markino is not actually a Specter but is one of these soldiers.
Skeleton Guards
skeleton surplice