Darkie/Black Beauty/Black Auster/Jack/Blackie/Old Crony—The narrator of the story, a handsome black horse. He begins his career as a carriage horse for wealthy people but when he "breaks his knees" (i.e. develops scars on his knees after a bad fall) he is no longer considered presentable enough and is put to much harder work. He passes through the hands of a series of owners, some cruel, some kind. He always tries his best to serve humans despite the circumstances.