A long time ago, toward the beginning of the 2020 quarantine, I posted this joke:

And well YOU ASKED FOR IT.

So here are my top three break-down theories on Ferris Bueller’s Day Off. (Spoilers. But if you haven’t seen this movie yet, I really don’t know what you’re waiting for)
1 Cameron Fry is the protagonist. Ferris Bueller is the narrator
The last time I watched this movie, I thought to myself, “This would make an excellent YA novel from the point of view of Cameron Fry.” That’s when the dynamic really became clear. This movie is Cameron’s story. Not Ferris’.
At the beginning of the movie, we see Ferris Bueller… super cool, untouchable, clever, and mischievous. And at the end of the movie, we see Ferris Bueller… super cool, untouchable, clever, and mischievous. He remains constant throughout the movie, he doesn’t have an arc. He doesn’t change. And he’s not supposed to! He acts as a constant change agent that shapes all the other characters around him. (More on that in point two).
In the contrast, we see Cameron at the beginning of the movie- sick, miserable, “not dying, just can’t think of anything good to do”. The character has a problem to be solved, like all good and compelling protagonists. He’s about to make a change. It’s The Hero’s Journey. He’s had the literal “call to adventure” and is now being forced out of his comfort zone into this crazy escapade with his best friend.

It’s not even Ferris’ DAY OFF, if you think about it. Ferris has already missed school nine times up to this point. This is Cameron’s Day Off.
Ferris is the narrator for Cameron’s story. Even stylistically, he breaks the fourth wall to look into the camera and address the audience directly. If you still don’t believe Cameron is the main character, consider this: Ferris doesn’t talk about the other characters. He’s not telling you how he met Sloane. Hardly the only thing he says about Jeanie is that she got a car and he didn’t. Throughout the movie, he tells the audience about Cameron. His cold relationships with his parents, his character flaws. Cameron Fry is the focus because he is about to make the biggest change (AKA protagonist)
2. Ferris helps the characters grow up not down
At a quick glance, you might think that Ferris is encouraging his friends to go off on a childish adventure. But he’s not. He’s forcing them to challenge authority and assume their own identities as adults. They’re not skipping school to go to the local arcade (which is what Rooney thinks they’re doing). He’s taking them to art museums, fine restaurants, and even the stock exchange. At every moment he’s challenging them to give up their passive childhood for an independent adulthood. Even Sloane is challenged by Ferris in this way when he asks her if she wants to get married.
It’s not about the irresponsibility, although he knows how to do that well. As the active change agent in the story he has a motive for each person. For example, it’s not about stealing the car, he’s getting Cameron to challenge his father.

In the B story, Jeanie is also forced to change in this way. She constantly gripes and moans about having no control in her life (If I was BLEEDING out my eyes you’d still make me go to school). Then after a therapeutic conversation with Charlie Sheen, she has FERRIS busting his a$$ to beat her home and SHE is the one to save him from Rooney. In parellel to Cameron’s story, she takes back her control.
3. Ferris Bueller is actually John Lennon
You really think I could go one blog post without mentioning this guy??
Okay but this is FOR REAL. I know a fellow Lennon-obsessed writer when I see one. And Hughes no-doubt-in-my-mind modeled Ferris Bueller after John Lennon. He basically tells us upfront.
Ferris first directly name drops Lennon to the audience, by quoting; “I don’t believe in Beatles, I just believe in me.” Then he tells us, “I could be The Walrus.”

Ferris spends the movie as the leader, challenging authority and encouraging mischief and mayhem a la “A Hard Day’s Night”. Hughes even recreated the same shot of them jumping in slow motion with their arms raised.

Then of course to cap it all off. He lip syncs to Twist and Shout on the parade float. And I really don’t know how you can get anymore obvious than that.
If you don’t believe that Hughes would go to such lengths to model a character after Lennon, consider The Breakfast Club, when the janitor readily admits that he wanted to “grow up and become John Lennon”. Or when Brian the Brain whispers to himself about being The Walrus.
At the very end of the film, Ferris leans back in his hands and says the classic line, “Life moves pretty fast, if you don’t stop and look around once and a while you could miss it.”
…Which is supposedly a derivative of this quote…

BONUS!
I truly feel that I would be amiss to not lead you into this excellent conspiracy theory from the inner depth of Redditt. The theory is that Ferris is actually a figment of Cameron’s imagination. It’s a more compelling theory than you would think! I’ll leave the video here, so you can have your mind blown.