Randall Flagg is a fictional character who appears in various Stephen King novels. Known for causing chaos and destruction, Flagg goes by many different names throughout his appearances. In "The Stand," he's called the Walking Dude, whereas in "The Dark Tower" series, he's known as the Man in Black. Other nicknames include The Hardcase, The Covenant Man, and The Interloper. These various synonyms emphasize the mysterious and nefarious nature of this villain. No matter what he's called, Randall Flagg always represents danger and evil, making him one of Stephen King's most memorable and terrifying characters.