Barrel is five years old, Oogie's "star pupil," and mistakenly considered the most stupid of the three troublemakers, despite his protests to the contrary. He is the butt of many jokes made by his siblings but usually gets even through his own tricks at which he always gets away with. Barrel wears a skeleton costume and has deformed feet, but otherwise resembles a small human boy, albeit one with white skin, sunken eyes, and perfectly combed back green hair. His face is round and has a perpetual grin, except when he is angry. Barrel is usually the pilot of the walking bathtub the trio use as transport. He also likes to eat pumpkins. Barrel is quick to stand up for either of his siblings and appears in fact to be the most intelligent of the three. He also unintentionally bothers Jack when asking him a number of annoying (and somewhat embarrassing) questions.
Barrel is the shortest and most rotund of the trio, sporting the same pale grey skin and blue lips as his friends. His head is spherical and he has short, pale green hair. His nose is very small when compared to Lock and Shock's, and it is upturned. His eyes are quite close together and appear to be sunken in, though this could just be an illusion created by the dark makeup arund them. Barrel dresses up like a skeleton, wearing tattered purple pants and a like-colored shirt. Both of these pieces of clothing are decorated with bones roughly corresponding to their locations in the human body. Unlike his friends, Barrel doesn't seem to wear gloves, but his feet are oddly shaped, with three toes of the same length. It isn't clear if they are part of his costume or his real feet. His mask is that of a skull; a simple, round, white mask with the mouth being bare teeth set in a wide grin, reflecting the fact that Barrel himself is usually grinning.