*Sadie Adler is a recurring character in the Red Dead series; she appears as a central character in Red Dead Redemption 2, and as a stranger in Red Dead Online.

Sadie grew up in a harsh environment and learned to hunt animals and ride horses in her youth. On September 7, 1896, she became married to Jake Adler. The couple lived on a ranch in the state of Ambarino, where they shared the work evenly between them and had a happy marriage.

Sadie was happily married to her husband, Jake Adler, and expresses that she was content in the life they lived together. His death made her deeply vengeful, vindictive, and consumed by desire for revenge against the O'Driscolls. Sadie also repeatedly demonstrates cruelty, a lack of care for her allies and recklessness which rivals that of Micah's - she is not above putting herself and her friends in unnecessary danger, which is exemplified in the battle against the O'Driscolls in Shady Belle where she does not co-operate with the rest of the gang, forcing Arthur to leave the house and risk getting killed, and murdering the O'Driscoll hostages at Colm's execution, starting a firefight. Her actions also indirectly led to Arturo Bullard's death - something Arthur had blamed her for. Sadie's personal interests could explain her own extreme aggressiveness and brutality, thus she saw her crusade against the O'Driscolls as more than simply ending a gang feud or hostility between the two gang leaders.

Despite this, Sadie is also very loyal those she cares about. She is extremely eager to prove to Arthur and Dutch that she can be a fighting member. This is evident when she zealously asks Arthur if they should rob the general store in Rhodes, asks Dutch if he can take her robbing, and leads the counterattack against the O'Driscolls at Shady Belle. She later helps to unite and relocate the gang, fend off the Pinkertons in Lakay, rescue John from prison and keeping the gang together while some of the main members are in Guarma. While initially being fairly shy, Sadie would eventually become more confident, defying Dutch's orders not to rescue John and not being afraid to challenge other members of the gang.

She also has a softer side for Arthur and holds him in high regard, even admitting that he’s the only one in the gang who she truly trusts and is the best man she has known, second only to her husband. Her concern for Arthur is also exemplified when she insists on taking up physically demanding tasks by herself, including rowing a boat from Sisika Penitentiary and running-and-gunning to rescue Abigail, preventing Arthur from doing the same despite his protests. At Beaver Hollow, she also reminds Arthur to take care of himself in camp conversations. Notably, as a widow, Sadie willingly promises Arthur that she will help John, Abigail and Jack to start a family life - one that she has lost since her husband's death. When Arthur bid her and Abigail a final farewell before he went to confront Micah over his treachery, she was visibly saddened, but held back her emotions unlike Abigail who openly wept.

As of 1899, Sadie is a slender young woman likely in her late 20s or early 30s, with dirty blonde hair and brown eyes. She also has a scar above her right eye.*