The Skeleton Army is made up of skeleton minifigures with torso, leg, head, and arm pieces. They wear belts and armor that is colored red, blue, gray, or white (their elemental colors). Generals have much larger heads than regular Skulkin, with different details on their scalps; Nuckal has a row of spikes, Kruncha has a helmet, and Wyplash has a stud to attach headgear (although the straw hat fits best).

The Skulkin have torsos with bolts printed above the rib cage. These torsos are new pieces with a colored belt depending on the element (even though they aren't Elemental Masters themselves). The Skulkin have two types of arms: regular arms for holding weapons normally, and sideways arms for holding weapons out to the side for Spinner battles. Both types of arms are bent at the elbows. Unlike previous skeleton figures, Skulkin warriors have black shoes, mainly so they can stand on spinners. The Skulkin wear different types of armor depending on their rank.

The trooper armor has bolts on the top and has metal across the chest with a Skulkin symbol. The sides have spikes over the shoulders that are colored differently depending on the element. The Generals have armor that features the Skulkin symbol and bones connected by straps to the shoulder guards. The shoulder guards have colored spikes to represent elements (the only colors shown are gray and white because only Kruncha and Wyplash have them).

Due to Samukai's unique design and high rank among the Skulkin, he has special armor. In the pilot episodes, it is brown, but in "Wrong Place, Wrong Time" and in "An Underworldly Takeover" it is white.

As of Season 11, the designs of all Skulkin seen are based on Wyplash's Legacy design. This means that they all have an above-average skull, smaller armor, no shoes, and a straw hat on their head. Due to their undead status, Skulkin gained a great amount of longevity and a form of indestructibility,