Answer:In "The Rockpile" by James Baldwin, the character that first identifies the rockpile as a dangerous place is Elizabeth.
Explanation: In the short story "The Rockpile" written by the American author James Baldwin, Elizabeth is the mother of Roy, John, Delilah and Paul as well as Gabriel's wife. <u>She is the first character that warns her children about the rockpile, a natural outcrop that she considers to be dangerous</u>. However, despite Elizabeth's warnings, Roy decides to go to the rockpile anyways and ends up hurt.