Meg Masters

Meg Masters is a frequent antagonist in Supernatural. Although her name was never revealed in Supernatural, she is better known as Meg after owning a human girl, she is also the daughter of Azazel, she is secundary antagonist in season 1 of the series, a minor antagonist in season 2 and 5 and an antiheroine for the remainder of the season before his death at Crowley's hands.

History
Meg was Azazel's daughter and she served as his assault, she followed Sam unbeknownst to him, and in the middle she killed several of the friends of the Winchesters who were hunters. Later when Meg fell into the trap of the Winchesters and Bobby Singer brothers, Dean Winchester for having her exorcised, trying to get him to kill his brother. However, Dean with Bobby Singer's help gets Meg out of Sam's body, but she's exorcised. Meg then returns with a new body and now serving with loyal Lucifer henchman.

After Lucifer's defeat and his imprisonment in the cage. Meg returns to take revenge with Crowley and makes an alliance with his enemies the brothers Winchesters and Castiel, they almost kill Crowley who deceive them. Then she becomes an ally of the Winchesters against the Leviathans, after they kill Dick Roman, Dean and Castiel are sent to purgatory. While Meg is captured by Crowley's demons.

In the time Meg was being held captive she was consistently tortured and humiliated by Crowley who dyed her hair blonde insinuating that she is stupid. But later when the Winchesters unknowingly discover that she was trapped in Crowley's captivity, she saves her. At the last moment. Meg hides Sam to escape. Meanwhile Crowley questions the actions of the Winchesters and begs her to stand against the Winchesters, for wanting to arrest the Hell forever, she refuses, that Crowley in a fit of rage kills her by stabbing her with an angel blade.