Barrel is the youngest member of Lock, Shock, and Barrel, Halloween Town’s resident trick-or-treating trouble squad and Oogie Boogie’s exceptionally unreliable collection of child henchmen.
He is the one in the skeleton costume, usually grinning while the trio turns somebody else’s bad idea into a substantially worse one. In The Nightmare Before Christmas, Jack Skellington recruits Lock, Shock, and Barrel to kidnap Santa Claus, but their loyalty to Oogie Boogie ensures the mission becomes far more dangerous than Jack intended.
Barrel is not the leader. Lock wants that job, while Shock is identified by Disney as the cleverest of the three. Barrel’s role is more straightforward: enthusiastic participation, gleeful chaos, and the kind of commitment to mischief that suggests nobody in Halloween Town has ever successfully implemented a bedtime.
That smaller role is exactly why the Character should stay compact. The film does not provide Barrel with a secret tragic biography, specialized magical powers, or an elaborate independent subplot. What it gives him is a clear visual identity, a place within the trio, and a memorable contribution to one of Halloween Town’s best bad decisions.
Skeleton costume. Lollipop. Bathtub transportation.
Sometimes the résumé is already complete.