Lock, Shock and Barrel

Lock, Shock & Barrel are the former secondary antagonists of Tim Burton's The Nightmare Before Christmas. They are three little trick-or-treat themed ghouls notable for being malicious pranksters as well as the henchmen of Oogie Boogie and\or Jack Skellington - although unlike Oogie Boogie, the three roamed quite freely around Halloween Town, though were definitely some of the more openly wicked of its residents.

Lock wears a devil-mask, Shock resembles a witch and Barrel has a skeleton-mask - these serve to make the three villains rather memorable along with their famous song "Kidnap the Sandy Claws", in which they describe in gruesome detail their plans to kidnap Santa and bring him to Oogie Boogie.

Jack Skellington, the main protagonist of the movie, actually hired Lock, Shock and Barrel to kidnap Santa Claus so he could take over Christmas but he was unaware of how much chaos this would ultimately cause and helped rescue Santa when things got out of hand. After Ooogie's death They find out without a boss to tell them what to do is more fun. The trio are not completely loyal to Oogie Boogie as they love to cause mischief more then they like pleasing him, so this makes them Anti-Heroes or Neutral Characters.

Kingdom Hearts series
As well as their role in the film, Lock, Shock and Barrel has also appeared as bosses in various video games, the more notable probably being in the Kingdom Hearts series.

Kingdom Hearts
In Kingdom Hearts, they steal an artificial heart from Dr. Finkelstein to give to Oogie. However, they are soon captured, without the heart. After their battle, they reluctantly reveal tips on how to defeat Oogie. It is assumed they leave the mansion afterwards, since they are seen in Kingdom Hearts II.

First Visit
In Kingdom Hearts II, it is revealed that they became Dr. Finkelstein's assistants. When they go out to play, they come across Maleficent and tell her of Oogie Boogie's fate. Maleficent revives Oogie and gives them control of the Prison Keeper Heartless as a distraction for Sora and company.

Second Visit
In the second visit, they are blamed for stealing Christmas presents from Santa. In the inevitable chase afterwards, the heroes discover the truth when they tell them about Dr. Finkelstein's Experiment.

Trivia

 * Their names are a play on the figure of speech lock, stock, and barrel, mean "all", "total", and "everything."