In chess, the queen is arguably the Dragon of the king, and quite clearly the most powerful piece on the board.
Just look at any themed chess set: the Big Bad will be the king, and the Dragon will be the queen.
In Betrayal at House on the Hill, there were several Dragons, ranging from a literal example to a slasher killer, a witch, and even man eating plants. One of the players could even be the Dragon to the scenario's Big Bad... or turn out to be Big Bad, and get furnished with a Dragon. The game has "betrayal" in its name for a reason.