The shadow is Voldemort because he faced the hero in battle and represents evil that needs to be defeated by the hero. Voldemort fights Harry for the sorcerer's stone because he wants the elixir of life.

Hagrid and Dumbledore are the mentors because he is a personal role model and guides the protects the hero by offering advice and gifts. Hagrid and Dumbledore show they are the mentors when thet=y give Harry the invisibility clock and advice about fluffy.

Ron and Hermione are the allies because they both help the hero in moments of crisis and are devoted to the hero. Ron and Hermione show they are devoted to Harry when they are all in the dungeon and they help harry get past the first and third tasks.

The threshold is Mr. Dursley because he stands in the way of the hero. Mr. Dursley stands in the way of Harry going to Hogwarts.

Hagrid is the hero because he acts as a single of coming change. Hagrid acts as a single of coming change when he tells Harry he is a wizard and shows him magic.

The shapeshifter is Professor McGonagall because she can transform shape and appearance. professor McGonagall can turn into a cat.