The Doctor has made many enemies in his travels, but a few of them recur enough to warrant a whole trait to themselves. The Adversary trait means that the character has made an enemy in the past who is actively trying to hinder them whenever possible. The key word here is ‘actively’. For example, the Daleks have gone to great lengths to battle the Doctor, chasing him through time and space, laying traps, and even luring him to WWII London to trick him into aiding the rebirth of their race.

Adversary can be a Minor or a Major Bad Trait depending upon the power and frequency of the Adversary’s appearance. For example, the Doctor scuppered the plans of Fenric and the Haemovores, but they haven’t resurfaced. If another colony of the Haemovores heard of the fate of their Northumbrian counterparts and decided to try to track down the Doctor for revenge, they’d count as a Minor Adversary Trait. They’re not too powerful, unlikely to appear in every campaign, but may appear as recurring villains. A fairly powerful Villain that makes an appearance every campaign such as the Daleks would count as a Major Adversary. They just keep surviving and coming back again and again, and consider the Doctor their greatest enemy.