They do not speak or have any expressions, they're basically zombies made out of ooze that the Skeleton King commands at his will on his ship, the Citadel of Bone. On the ship, he keeps a tank of ooze that makes his army to which to send to Shuggazoom to attack it. The Formless are very stupid and not very powerful, but when a large group of them come together, they can make a giant formless monster to attack the city. When a formless is defeated, it will melt back into ooze. The formless are usually seen riding on motorcycles into the city.