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!!John Bender
->'''Played by:''' Judd Nelson
* AbusiveParents: His father is a physically abusive alcoholic, who also beats his wife.
* AntiHero: Type IV or V.
* AttentionWhore: Will seemingly do anything to attract your attention.
* AxCrazy: This generally implies in him, particularly in the "I want to be an Airborne Ranger" scene.
* BerserkButton: Call him a liar. I dare you.
* BookDumb: For someone who's made out to have plenty of school trouble, Bender is scarily articulate and intelligent.
%%* CoolLoser
* DeadpanSnarker
* [[FourTemperamentEnsemble Five Temperament Ensemble]]: Sanguine
* HeroicSacrifice: Bender draws the attention of Vernon after the Club runs into a dead-end during their hallway jaunt, allowing the other four to get back to the library undetected.
%%* IneffectualLoner
* {{Jerkass}}
** JerkWithAHeartOfGold: His sympathetic qualities are buried so deeply under so much antisocial behavior and cynicism that it comes off as a HiddenHeartOfGold at times.
* HeroicComedicSociopath: Straddles the line between this and a SociopathicHero.
* LastNameBasis: Note how the other kids refer to him simply as "Bender".
* MilesGloriosus: He puts out an image of toughness but Andy is able to take him down with ease. Even when Bender pulls a knife and casually talks about killing Andy, he's slowly backing away from the fight.
* MouthyKid: When Vernon attempts to find a solution to keep the door open. Bender's comments are both hilarious and true.
* SarcasticClapping: "That was great, Claire. My image of you is totally blown."
* SmarterThanYouLook / JerkAssHasAPoint: While he isn't book smart, he is able to cleverly deduce things about the others. He was the first to tell that Claire is a virgin before Allison made her admit it and was the first to notice that Andrew didn't like his parents before Andrew tearfully admitted it in the end.
--> '''Bender:''' You're an idiot anyway, but if you said you liked your parents then you're a liar too.
* SociopathicHero

!!Claire Standish
->'''Played by:''' Creator/MollyRingwald
* AbusiveParents: Her parents use her as a weapon to get back at each other.
* AllGirlsWantBadBoys
* AlphaBitch
** LovableAlphaBitch
* [[FourTemperamentEnsemble Five Temperament Ensemble]]: Choleric
* {{Jerkass}}
** JerkassFacade
* LargeHam: She's played by '''MollyRingwald'''. ''It's a must.''
* [[NominalHero Nominal Heroine]]

!!Andrew 'Andy' Clark
->'''Played by:''' Emilio Estevez
* AbusiveParents: His father lives vicariously off of his athletic acheivements.
* BigEater
* BigManOnCampus
* [[FourTemperamentEnsemble Five Temperament Ensemble]]: Phlegmatic
* JerkJock: Deconstructed.
** JerkWithAHeartOfGold
* KnightInSourArmor
* WellDoneSonGuy: Hoo boy...

!!Brian Johnson
'''Played by:''' Anthony Michael Hall
* AbusiveParents: His parents guilt trip, intimidate, and generally emotionally abuse him to make straight A's. Like Andy's dad, it's insinuated that they're living off of him as well.
* {{Adorkable}}
* BewareTheNiceOnes: His epic '''FUCK YOU''' to Claire's claim that he and his friends want to be like her and the "cooler kids".
* ClassicalAntiHero: Easily one of the nicest characters in the story, despite how harshly life treats him.
* EducationMama: His parents are rather unscrupulous examples.
* [[FourTemperamentEnsemble Five Temperament Ensemble]]: Melancholic
* GirlfriendInCanada: Or so he claims.
* InsufferableGenius: At times.
* NiceGuy: The nicest one in the bunch.

!!Allison Reynolds
'''Played by:''' Ally Sheedy
* CloudCuckooLander
* CrazyConsumption: Allison lets her soda spill out, and licks it off the table. Then she throws away the baloney from her sandwich, and replaces it with Pixy Stix (powdered candy) and Cap'n Crunch cereal.
* [[FourTemperamentEnsemble Five Temperament Ensemble]]: Leukine
* HandyFeet: She claims she has them. In the uncut version of the movie, the only copy of which was on a VHS tape lost after John Hughes' death, this claim was followed with her actually writing with her toes, completely filmed.
* LonersAreFreaks
* ParentalNeglect: The only information she ever volunteers about her parents is when Andy asks her what her parents did to her. She replies with a simple but pained "they ignore me".
* RavenHairIvorySkin
* SelfProclaimedLiar
* SheCleansUpNicely
* StrangeGirl
* SweetTooth: See CrazyConsumption above for elaboration.

!!Richard 'Dick' Vernon
'''Played by:''' Paul Gleason
* DeanBitterman: although it's deconstructed somewhat in his conversation with Carl.
-->'''Vernon:''' Carl, I've been teaching for twenty-two years. And, each year, these kids get more and more arrogant.
-->'''Carl:''' Aw, bullshit, man. Come on, Vern, the kids haven't changed; ''you'' have. You took a teaching position because you thought it'd be fun, right? Thought you'd have summer vacations off. And then you found out it was actually work, and that really bummed you out.
-->'''Vernon:''' These kids turned on me. They think I'm a big fucking joke.
-->'''Carl:''' C'mon…listen, Vern, if you were sixteen, what would you think of you, huh?
-->'''Vernon:''' Hey, Carl. You think I give one rat's ass what these kids think of me?
-->'''Carl''': Yes, I do.
* {{Jerkass}}
* KnightTemplar
* MeaningfulName: There's a reason why his name is Dick. Have a guess.

!!Carl Reed
'''Played by:''' John Kapelos
* AlmightyJanitor
* DeadpanSnarker
* KnightInSourArmor: He isn't exactly cheerful about life or his job, but keeps on trucking.

!!Mr. Standish
'''Played by:''' Tim Gamble
* AbusiveParents: Psychologically. He uses Claire to get payback on his wife, who is no saint either.
* EvilIsPetty
* {{Slimeball}}: Note how he bribes Claire with the bag as he drops her off.
* SmugSmiler / StepfordSmiler
* SugaryMalice: Never loses his fatherly façade.

!!Mrs. Johnson
'''Played by:''' Mercedes Hall
* AbusiveParents
* EducationMama: A particularly nasty variant.
* EvilMatriarch
* {{Jerkass}}
* LackOfEmpathy:[[spoiler:Apparently doesn't give a rat's ass about her son's possible suicidal tendencies.]]
* StageMom

!!Mr. Clark
'''Played by:''' Ron Dean
* AbusiveParents
* DoWrongRight: He chastises Andy not because he taped Larry Lester's buttocks, but because he was caught doing it.
* FauxAffablyEvil: Seems jovial and understanding at first.
* FatBastard
* {{Jerkass}}: Unapologetically.
* HairTriggerTemper
* {{Hypocrite}}: Calls Andrew a "discipline case" despite pressuring him into being a JerkJock.
* RetiredMonster: It's implied that he's done much worse things than taping nerd's buns together.
* {{Slimeball}}
* SmugSnake
* [[StageMom Stage Dad]]