Lock, Shock, and Barrel

Lock, Shock, and Barrel are characters from the Kingdom Hearts and Kingdom Hearts II. They are Oogie Boogie's costumed sidekicks. They are a trio of children in Halloween garbs of a devil, witch, and skeleton, respectively.

Kingdom Hearts
In the first game, they stole an artificial heart to give to Oogie. However they were soon caught, although the heart was gone. During their boss fight, Lock used a slingshot, Shock spun like a ballet artist, and Barrel rolled across the floor.

Kingdom Hearts II
In Kingdom Hearts II, they controlled the Prison Keeper Heartless during the first visit as a distraction for Sora and company. In the second visit, they were blamed for stealing Christmas presents from Santa. In the inevitable chase afterwards, the heroes discovered the truth when they told them about Dr. Finkelstein's Experiment.