Dungeons & Dragons plays a significant role in Will Byers's character development in Stranger Things. It's not just a game for Will and his friends, but a metaphor for their real-life adventures. The game's first campaign in 'The Vanishing of Will Byers' foreshadows the events of Season One, with the Demogorgon appearing and taking Will, just as the monster does in the following scenes. As Will grows older, he struggles with the loss of his childhood, symbolized by his friends' disinterest in D&D. Despite this, Will's connection to the game helps him and his friends understand and combat the supernatural threats they face, such as the Mind Flayer. So, Dungeons & Dragons is integral to Will's character arc, symbolizing his journey from an innocent child to a brave hero.