Six Earlier Days, a prequel-of-sorts, was released the same year, first digitally and later attached to the paperback edition of Every Day. A companion book titled Another Day was released in 2015 and tells the story from Rhiannon's perspective. A sequel titled Someday was released in 2018.
A film adaptation was announced in June 2017 and released in February 2018, with Angourie Rice as Rhiannon.
Every Day provides examples of:
- Aborted Arc: In the film, Nathan's crusade against A isn't brought up again after Rhiannon interviews him.
- Adaptational Alternate Ending: While A still leaves in the film, it ends happier for Rhiannon, who ends up with one of her friends, while A is able to move on and start a new "life" in another city.
- Adapted Out: Reverend Poole is absent from the film version, except in deleted scenes.
- The All-Concealing "I": A's gender, or even if A has one, is never stated because of the first person perspective. (The publisher's blurb does refer to A as "him", though.)
- Big Bad: Unlike the first story, Someday clearly has one in the form of X.
- Black Gal on White Guy Drama: When A occupies a very attractive black girl and tries to seduce Justin to get Rhiannon to break up with him. It doesn't work.
- Averted in the film, not only was the scene cut but Justin is played by biracial actor Justice Smith.
- Body Surf: A's main form of existence is waking up as a new body every day. This causes problems when one of A's bodies becomes extremely disturbed by the belief that he's been possessed.
- But Not Too Bi: A is attracted to both girls and boys, though the main person we see A with is Rhiannon. Justified, since A has no sex and no gender. It so happens that A is in a male body when falling in love with Rhiannon.
- Can't Act Perverted Toward a Love Interest: When A occupies Rhiannon, this is why "she" doesn't fully change. In the film, A does shower in her body, but tries not to look at it while doing so and apologizes when they accidentally do, even though Rhiannon can't hear it.
- Chastity Couple: Rhiannon and A. They try to have sex at one point, but A doesn't want to take away the virginity of the body A is occupying. In the film, however, they apparently have sex while A is occupying Alexander's body.
- Clingy Jealous Guy:
- A to Rhiannon.
- Justin, who usually ignores Rhiannon, becomes a Crazy Jealous Guy when he spots A (in a male body) interacting with Rhiannon at a party.
- Commitment Issues: A and Rhiannon's relationship is an interesting variety. A can't settle down with her reliably, no matter how badly A wants to, because of keeping on switching bodies. This is part of why Rhiannon eventually calls off their relationship.
- Destructive Romance: A's romance with Rhiannon ends up causing big trouble for her over and over, most notably when Justin thinks she's cheating (which she actually was, in a way) and breaks up with her.
- Domestic Abuser:
- Downplayed with Justin but he's still a neglectful, jealous asshole who disregards his girlfriend's wishes on a regular basis. It gets lampshaded when, after being possessed by A, said girlfriend is stunned by how much more attentive and kinder "Justin" is. The only time Justin acts decently toward her is when he defends her from being called slut after they break up.
- Also downplayed, but all of A's pre-Internal Reveal interactions with Rhiannon are based on deception. He's inside the body of her boyfriend Justin and never once occurs to A to tell her the truth, even after A falls in love with her. And that's not counting how A manipulated Justin to break up with her so A can be with her. Talk about Entitled Bastards.
- Downer Ending: The book ends with A deciding that a relationship with Rhiannon won't work, and running away from her.
- Driven to Suicide: One girl that A occupies was suicidally depressed, and A stays in her body long enough to ask for help.
- Foregone Conclusion: You know from the beginning that it can't work out between A and Rhiannon, but it's still so sad!
- Hair of Gold, Heart of Gold: Rihannon is blond in the film, with a sweet personality.
- Heel Realization: After continually occupying Alexander's body in the film, A realizes that it's wrong to steal his life, especially when A starts ruining his familial relationships in order to pursue a relationship with Rhiannon.
- Homeschooled Kids: One of the bodies A occupies is a homeschooled kid with an extremely strict, overbearing mother.
- If It's You, It's Okay: Rhiannon tries to take this attitude towards A whenever A occupies a girl. It doesn't work.
- Incompatible Orientation: Rhiannon to A, whenever A occupies a girl's body. Averted in the film as Rhiannon has no qualms about kissing A as a girl and even admits to liking girls when she is caught doing so.
- I Want My Beloved to Be Happy: The film ends with A leaving for a new life and persuading Rhiannon to start dating one of her friends who is perfect for her.
- Kissing In A Tree: A and Rhiannon kiss in a treehouse towards the end of the book.
- Killed Off for Real: In Someday, X kills Reverend Poole after being tired of his body.
- Let's Just Be Friends: Rhiannon's original suggestion for what her relationship with A should be. It doesn't work.
- Love Cannot Overcome: The ending of the novel, where A flees, realizing that the relationship will never work out and breaking Rhiannon's heart in the process."I wanted love to conquer all. But love can't conquer anything. It can't do anything on its own. It relies on us to do the conquering on its behalf."
- Averted in Someday. Despite the fact that they have no answer to A's Body Surfing, the two rekindle their romance anyway
- Love Triangle: With Rhiannon in the center and A and Justin on either end. She Takes a Third Option and ends up without either one.
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Missing Trailer Scene: The trailer for the film features a couple of bodies that A occupies that don't make it to the final cut of the film. - Mistaken for Gay: Before A tells Rhiannon what's going on, A meets her at a party in Nathan's body, and A accidentally leads her to believe Nathan is gay. This turns out to work to A's advantage, because A gets to dance with her without Justin being worried.
- No Biological Sex: A has no body of his own, and feels no more or less comfortable when inhabiting a male or a female.
- No Sense of Personal Space: When A possesses Amy, she is very touchy-feely with Rhiannon, which makes the latter very uncomfortable.
- Non-Human Non-Binary: Due to being a disembodied consciousness who can occupy either sex, A identifies with both boys and girls and neither at the same time.
- Oh, Crap!: A wakes up in the body of someone who is about to go on vacation, meaning A will start occupying bodies far away from Rhiannon if the vacation isn't called off.
- Pride Parade: A goes into the body of a gay dude and him and his boyfriend attend a pride parade.
- The Reveal: There are others like A, and Reverend Poole is one of them.
- Single-Target Sexuality: A towards Rhiannon. Despite occupying bodies for 16 years, A has never felt any kind of romantic feelings towards anyone except her.
- In Someday, it becomes clear that the feeling is mutual as Rhiannon doesn't stay with her new boyfriend very long after A returns.
- Take a Third Option: Rhiannon ends up with neither A nor Justin. In the film, she ends up with one of her friends.
- There Is Another: Reverend Poole reveals that he goes from body to body, just like A does, except that he knows how to stay in one body for as long as he wants.
- Unusual Chapter Numbers:
- Each chapter is a day in A's life, starting on Day 5994.
- Six Earlier Days takes this a step further with chapters named after earlier, unconnected days in A's life.
