What are we gambling for, you ask? Nothing all that valuable. Just your life!
~ Oogie Boogie sets the stage.

Gamblers are villains who live on gambling, or enjoy gambling. Sometimes, they don't just gamble with money, but also people's lives.

These villains tend to be chaotic, unreliable, temperamental and capricious since they hold allegiance to no one and tend to trust fortune/luck more than sheer power/strength.