Amelia Bones is the head of the British Department of Magical Law Enforcement (canon) until 1992. She then becomes Chief Warlock (canon) following Albus Dumbledore after his disapperance on June 13th 1992.
Bones is described as stern and tough-looking. She is experienced in magic and mysteries. She was able to guess Harry Potter's connection to Tom Riddle after Hermione Granger's trial before the Wizengamot (canon).
Dumbledore had designated her as regent for Harry through inheritance of the Line of Merlin Unbroken. As Harry defeated Voldemort on the same day as Dumbledore's fall, he is the full owner of the Line but he entrusts Bones with it "for Wizengamot-related functions".