A sixteen-year-old Disabled Snarker and the protagonist of the story. She suffers from lung cancer.
- Adaptational Attractiveness: In the book, she's described as plain if not downright awkward-looking. This was obviously averted when beautiful Shailene Woodley was cast in the role.
- Affectionate Nickname: "Hazel Grace" as opposed to just Hazel.
- Badass Bookworm: She's an intellectual who's taking college courses at sixteen. And of course, we don't need proof that she's a badass.
- The Big Damn Kiss: She kisses Gus in Amsterdam, and it only heats up from there...
- Boyish Short Hair: She has this, but it's a side effect of chemotherapy rather than a conscious addition to a tomboyish appearance.
- Brainy Brunette: Though her hair's dirty blonde in the book, she's played by a brown-haired actress in the movie.
- Conditioned to Accept Horror: Her nonchalant reaction to the death of a twelve-year-old kid from Support Group shows just how desensitised she is to her own (and other people's) illness.
- Control Freak: Played for Drama. She desperately wants to minimise the collective damage when she kicks the bucket.
- Delusions of Eloquence: Though her and Gus are fairly smart for their age, their dialogue is occasional pretentious and they misuse words (notably "soliloquy") and misunderstand concepts (infinity).
- Disabled Love Interest: For Gus.
- Friendless Background: It's hard for her to make genuine human connections due to cancer.
- Handicapped Badass: She's as tough as they come.
- Homeschooled Kids: She got her GED thanks to this and is now studying at a local community college.
- Insecure Love Interest: When she notices Augustus is staring at her, she immediately becomes conscious of her physical flaws.
- Jerkass Realization: Her moments of Brutal Honesty are often followed by her wishing she hadn't said anything, since she knows she was just kind of being a jerk, even though she didn't mean to.
- Little Miss Snarker: She's got a dreary outlook on life and uses a heavy pile of sarcasm to voice it.
- Minor with Fake I.D.: When her mother reprimands her for not "having a life", she jokes about getting one of these.
- Reality Is Unrealistic: Hazel is terminally ill and her boyfriend is in remission. Nonetheless, Hazel lives while Augustus dies. In reality, this is very much possible.
- Sesquipedalian Loquaciousness: As in any John Green book, she speaks in complex metaphors unusual for a girl her age.
- Smart Gal: Pretty much.
- Their First Time: Has this with Gus in Amsterdam.
- Wise Beyond Their Years: She's oddly smart and philosophical for a sixteen-year-old.
Hazel's first serious boyfriend and a subversion of the Manic Pixie Dream Boy trope. He's got cancer, but it's infinitely less dangerous than the variant Hazel has.
- The Ace: He was a charming, popular jock before his cancer started affecting him more seriously. Turns into a Broken Ace later on.
- Artificial Limbs: Has a prosthetic leg that ends just below his knee.
- The Big Damn Kiss: Has one with Hazel at the Anne Frank house. This later turns into Their First Time.
- The Casanova: It's not actually mentioned how many girls he's managed to pull in, but Hazel assumes that number to be pretty damn high. The fact that he's a virgin shocks her.
- Delusions of Eloquence: Though he is genuinely smart, his speeches are often a little too wordy and he ends up misunderstanding his own point.
- Disabled Love Interest: For Hazel and Caroline. Averted in that both of his girlfriends were disabled as well.
- Geeky Turn-On: He's clearly attracted to Hazel's intelligence.
- I Just Want to Be Special: His ongoing crisis over not being able to achieve something noteworthy before he dies from cancer.
- Kendo Team Captain: He was the captain of varsity basketball as a freshman, and in a pretty athletics-focused state at that.
- Stereotype Flip: Of the Manic Pixie Dream Girl - or boy, in this case. Though he tries to come across as a spontaneous, poetic The Charmer in order to impress Hazel, she's not impressed. In fact, she likes him perfectly fine the way he is.
- Unexpected Virgin: Hazel is surprised at Gus's virginity due to his good looks, but as he says, being a one-legged cancer survivor doesn't exactly help him get laid.
Augustus's adorably geeky friend with a rare form of eye cancer. He's depressed because he recently got dumped by his girlfriend, though he manages to overcome it eventually.
- Blind Mistake: His aim when egging Monica's car.
- Disabled Snarker: It's how he copes with going blind.
- Hormone-Addled Teenager: While he did genuinely care about Monica, certain PG-13 passages from the book imply their relationship was a little bit based on this.
- Make-Out Kids: Was this with Monica before they broke up.
- Men Don't Cry: Averted. He openly weeps over his girlfriend dumping him, and again at Augustus' pre-funeral, as the reality of his best friend dying finally sinks in.
- Nice Guy: Occasional bouts of anger aside, he seems to be a pretty sweet guy.
- Odd Friendship: With Hazel - the two of them stick together after Augustus dies.
A twelve-year-old boy with leukaemia. Attends Hazel's Support Group.
- The Baby of the Bunch: He's twelve, and the youngest out of the named Support Group members.
- Cheerful Child: Averted. While most of the other Support Group kids are significantly older than him, they seem to be more humorous about their conditions as well.
- Death of a Child: He dies quite early on in the book, but it's not made out to be that big of a deal. Probably because kids dying in a cancer support group is likely the norm.
- Littlest Cancer Patient: He's tiny, soft-spoken and seems to be sick even for a cancer patient (he takes the elevator to meetings, which Hazel notes as a sign for poor health).
A strikingly pretty girl in Support Group. She's sixteen years old and in remission from cancer.
- Everyone Loves Blondes: She's a blonde who's described to be bubbly and attractive.
- Girly Girl with a Tomboy Streak: She's chatty, beautiful and eats up the faux-positive Support Group affirmations, but she's also stated to be into athletics.
- Innocently Insensitive: She states that she admires Hazel's strength and wishes she had it, but Hazel rather understandably wishes she didn't have to be strong and would much rather have Lida's remission. This prompts Lida to apologize, but Hazel feels like a jerk for saying anything since she knows Lida meant well.
- Light-Haired Swimmer: A blonde swimmer.
- Passionate Sports Girl: Lida is an athlete, and at least good enough to be on her high school swim team.
A shy, dorky yet cute girl with a large scar on her face that she likes to cover with make-up. Is stated to be younger than Hazel and Gus.
A shy young girl who Augustus knows from his time at the hospital.
Hazel's supportive and sensitive father. More idealistic than either Hazel or her mother.
- Amazingly Embarrassing Parents: Has some shades of this, though it's not as exaggerated as most examples of the Trope.
- Men Don't Cry: Averted. His daughter is dying from cancer, for God's sake, and he's going to have to let his masculinity down to mourn that.
- Masculine Girl, Feminine Boy: Downplayed with Hazel's mother. He's the emotional caretaker of the family, while Mrs. Lancaster is more blunt and has a darker sense of humour.
Hazel's mother. A smart, practical woman who cares deeply about her family.
- Her Heart Will Go On: A rare familiar example. She reveals to Hazel that she's getting a degree to help other cancer patients, partially in order to pre-occupy herself when Hazel dies.
- Masculine Girl, Feminine Boy: Her dynamic with Mr. Lancaster is a downplayed version of this trope.
- My Beloved Smother: She has shades of this, but unlike most examples, it's Played for Drama - she's unusually protective of Hazel because she's constantly anticipating her death.
Augustus's vaguely embarrassing Hipster parents.
- Aerith and Bob: They have two daughters called Julie and Martha, and then their son comes along and he's stuck as Augustus.
- Ambiguously Christian: Their house is plastered with pseudo-religious motivational quotes, and they send their son to a Christian support group. Whether they're religious is unknown.
- Amazingly Embarrassing Parents: They keep religious affirmations in their house, for God's sake.
- Appeal to Familial Wisdom: Hazel quotes their Encouragements at Gus's funeral.
- Hands-Off Parenting: Played with. They do let their son go unsupervised to Amsterdam, but there's definitely some quarrel involved.
- My Beloved Smother: Downplayed.
Augustus's doting older sisters.
- Amazingly Embarrassing Parents: Oh, God. They're siblings instead of parents, but they're so much older than him that they essentially qualify.
- Baby Talk: To Augustus at the hospital.
- Passionate Sports Girls: Not sure to what extent, but they're shown to be playing basketball in one of Augustus's home videos.
- Practically Different Generations: They're twenty-eight to Augustus's seventeen.
- Single-Minded Twins: Seem to have the same personality, though it's justified seeing as they're minor characters.
- Adapted Out: Not even mentioned in the movie.
- The Ditz: She doesn't appear to be the brightest, at least intellectually.
- Dude Magnet: She doesn't have a shortage of guys to date. Considering her bubbly personality and that Hazel describes her as looking like a twenty-five year-old British socialite, it's not hard to see why.
- The Fashionista: Said to be fond of shopping and clothes.
- Good Bad Girl: Though she's been with a lot of boys and is rather sexual at times, she does also seem to be a pretty good friend.
- Likes Older Men: She dumps her same-age boyfriend because he was "too much of a boy", implying that she is looking for more of a "man".
- Teens Love Shopping: Seems to be quite fond of this.
- Tomboy and Girly Girl: The glamorous Girly Girl to Hazel's Tomboy.
A bitter-but-beautiful cancer patient who acts as a Lost Lenore to Augustus.
- Ailment-Induced Cruelty: The brain tumor did not do wonders for Caroline's temperament.
- Ambiguously Brown: Her skin is a darker shade, but her race is never specified. Hazel thinks she might be Italian.
- Adapted Out: A lot of fans were frustrated that she wasn't even given a mention in the movie.
- Betty and Veronica: She's a foreign, hot-tempered Veronica to Hazel's intelligent Betty. Subverted in that Caroline is dead and choosing between the two girls never had to be a struggle for Augustus.
- Bullying the Disabled: Her running joke about Augustus having great legs - oh, wait, leg! Averted with the fact that she's a cancer patient, too, which suggests that her cruel sense of humour is merely her way of coping with a terminal disease.
- Disabled Snarker: A lot more malicious than most examples of this trope.
- Foil: To Hazel. Their personalities differed pre-diagnosis (Hazel was quiet and introspective while Caroline was outgoing and vivacious), but after cancer they seemed to be stuck doing pretty much the same thing, namely lying in bed and waiting to die. The same can be said for their appearance - their inflated heads and sickly bodies match, but they hardly looked alike before their illness. Furthermore, on a slightly saddening note, Augustus was in love with Hazel but not Caroline, finding the latter to aggressive due to her tumour induced Mood Whiplash.
- Identical Stranger: Played with. Augustus is first struck by Hazel because they look alike, and when Hazel later looks up pictures of Caroline from her final months, she says they look like they could be sisters. However, when she compares Caroline pre-cancer to herself pre-cancer, they look nothing alike. Only their "cancer selves" are identical.
- Jerk with a Heart of Gold: It's implied that she was a lot sweeter pre-diagnosis.
- Spicy Latina: Her race is never explicitly stated, but if she's Latina she falls into this trope.
A child who's briefly mentioned to ask Hazel to borrow her cannula.
- Adapted Out: Her scene in the movie, which would have starred John Green as her protective dad, was cut from the final version of the film.
- Constantly Curious: Enough to ask an obviously-sick girl to borrow her cannula. Hazel appreciates this about her.
- Tomboyish Name: "Jackie" qualifies. Overlaps with Gender-Blender Name.
Isaac's healthy ex-girlfriend who breaks up with him upon finding out that he's going blind.
The author of Hazel's favourite book, An Imperial Affliction. Lives in the Netherlands with his assistant.
- The Alcoholic: Clearly has a drinking problem. Lampshaded by Lidewij.
- Author Avatar: A shockingly cruel example. Though he hopes he's less of a jerk about it, John Green says that Peter van Houten's opinions on Death of the Author reflect (or at least used to reflect) his own. Green has also noted that van Houten is somewhat of a dark reflection of himself, having somewhat exaggerated version of what Green sees as his own worst character flaws, and that he didn't intentionally write the character like this, but it was something that occurred to him in hindsight as he was looking back over his writing.
- Genius Slob: He's a brilliant writer and very intelligent, but his personal life is frankly a mess.
- Hidden Depths: The reason he's so crass and impolite to Hazel is that she reminds him a little too much of his daughter, who died when she was eight. It's probably the reason he's such a Jerkass in general, too.
- Insufferable Genius: Dear God. And it seems as though he does it on purpose, too - he talks in philosophical dilemmas and mathematical paradoxes in order to make conversing with him difficult.
- Sesquipedalian Loquaciousness: Does this deliberately to irritate others.
Peter van Houten's young and bubbly assistant.
- Aerith and Bob: Easily the most difficult name in the book. If you can remember this one, kudos to you for your memory.
- The Caretaker: Towards Peter.
- Hidden Depths: She's actually shown to be pretty intelligent with the minimal characterisation she gets. She speaks an impressive amount of languages at the Anne Frank house, is studying for a degree in American Literature, and clearly has a mind of her own (as shown when she resigns from her job in indignation).
- Intergenerational Friendship: With Peter van Houten, her former boss. Doubles as an Odd Friendship considering their different demeanours.
- Morality Pet: For Peter van Houten, but only to a certain degree.
Essentially a Spoiler Character, so if you're not done reading the book, you should probably click away right about now. She is Van Houten's late daughter who died from cancer when she was eight years old.
- Death of a Child: Is barely eight years old when she dies.
- Expy: It's pretty much a given that the main character of An Imperial Affliction was based on her. They even share a name.
- Foil: To Hazel. Anna died at eight while Hazel's still kicking at sixteen, a distinction that seems to be important to Peter van Houten (which is why Anna's literary self survives into her adolescence).
- This is implied to be the reason why Peter is so needlessly cruel to Hazel - his daughter's memory is too much to bear.