The idea of the monomyth is a basic storyline for hero stories. Joseph Campbell analyzed hero stories and found that most, if not all, follow a similar pattern. Why do we have stories that follow a similar pattern? I think that a reason that hero stories follow a similar pattern is because it is a timeless way of telling the story and it does not need to be changed. It's a human epic that tells the story of humans being put to the test. While following that same pattern, we can judge the heroes in different stories and compare how well they faced the challenges. When we have stories that follow the same pattern, we can see the transformations they have gone through.

A person who follows the monomyth is Harry Potter. In Harry Potter and the Deathly Hallows, he faces Voldemort in the Battle of Hogwarts. At that battle, he is in Initiation, and he is on the Road of Trials. Some of his trials in this movie are, fighting off death eaters and fighting Voldemort and his snake. Watch: Harry Potter and the Deathly Hallows Clip

Another person who follows the monomyth is Katniss Everdeen from the Hunger Games. When she steps on that pedestal and enters the arena, it is the culmination of all of the trials she has faced earlier. All of the trials she has encountered in the days past, will be put to the test. She is still in Initiation, but now it is the Ultimate Boon. 

Luke Skywalker is an example of a hero who does not follow the monomyth. In Star Wars IV: A New Hope, Luke finds himself in a heated battle with Darth Vader. Soon, Luke is held down with a lightsaber pointed at his face. Darth Vader tells him that if he joined him, they would be powerful enough to take over the whole galaxy. This is sort of like a call to another adventure. Like the monomyth, Luke refuses at first. But what happens next is not in the monomyth. Joseph Campbell stated that the hero would reluctantly answer the call, but Luke is firm, and does not give in.