An other example of him being a hero is risked his life for others was when he told his friends to go back and he would go on his own.

Voldemort is the shadow because he represents evil that needs to be stopped when he is trying to get the stone.

Voldemort possesses Professor Quirrell for his own want which supports he is the shadow.

Hagrid and Albus Dumbledore are mentors because, Hagrid helps Harry and his friends by giving them knowledge.

Albus Dumbledore helps Harry by giving him the invisibility cloak.

The Mountain Troll and Fluffy are threshold guardians because the Mountain Troll fights Harry and his friends and Ron had to use a spell so they would live.

Fluffy tries to stop Harry and his friends from getting to the Sorcerer's Stone.

Professor Mcgongall is a shapeshifter because she can change her shape when she changes into a cat.

She moves the plot forward by telling them the stone is heavily guarded.

Hermoine Granger and Ron Weasly are allies because they help Harry when it's needed by helping in the dungeon.

Hermione also gives advice to Harry for his survival.

Hagrid is the herald because the knowledge given the trio moves the plot in a way of getting into challenging stages because of the wisdom he gives them about the dungeon.

Hagrid acts as a change in Harry's world by bringing him to Diagon Ally and Hogwarts.

Harry is used to the family being mean to him normally.

Then Hagrid came to pick him up.

But Hagrid came and the Dursleys refused Harry going.

Hagrid tells Harry how his parents died and tells him he's a wizard.

They go to the train to platform 9 3/4 to Hogwarts.

Harry has to use a broom to catch a flying key.

Ron has to play wizard chess and win.

When Harry looks into the mirror he gets the Sorcerer's Stone.

Harry and Voldemort fight for the stone.

Harry leaves with the stone.

Harry doesn't remember much after the battle.

He also learns Ron is fine and more about his parents.

Harry also leaves knowing he won't have to deal with Voldemort for a while.