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'''Warning! Character sheets are spoilerific.'''
!The Plastics


[[folder: As a Whole]]
* AntiVillain: All of them, in their own way. See their separate character folders for details.
* BlondeBrunetteRedhead: After Cady enters, and especially after [[spoiler:Regina leaves]].
* FourTemperamentEnsemble: Cady (phlegmatic), Regina (choleric), Gretchen (melancholic), and Karen (sanguine).
* GirlPosse: They're the titular mean girls that rule the school.
* LargeAndInCharge: The two dominant members (Cady and Regina) are noticeably taller than the two followers (Gretchen and Karen.)
* NiceMeanAndInBetween: In the original trio, [[BrainlessBeauty Karen]] is the nicest one (if only because she's too [[DumbIsGood dumb]] to be truly malicious), AlphaBitch Regina is the mean one, and Gretchen is in-between (fairly nice, only acting mean under the influence of Regina). When [[spoiler:Regina leaves, Cady briefly becomes the mean one as the new Queen Bee.]]
* PinkMeansFeminine: The Plastics have these rules surrounding the color pink, which they must wear every Wednesday.
* PoliticallyIncorrectVillain: They have no qualms about branding Janis a "dyke," and Regina uses the word "retarded" casually in her first on-screen conversation.
* PopularIsDumb: Played straight with Gretchen and ''especially'' Karen. Zig-zagged with Regina who despite being able to manipulate most of the female half of the school into becoming her pawns, frequently shows herself to be rather BookDumb. Discussed and justified over the course of the movie - Cady, during her [[BecomingTheMask evolution into the]] AlphaBitch, begins [[ObfuscatingStupidity dumbing herself down]] so a boy will like her. They also state joining academic clubs like the Math Club (or "Mathletes") is "social suicide".
* SexySantaDress: In their "Jingle Bell Rock" routine that they do for the Winter Talent Show (which, according to [[GayBestFriend Damian]], they do every year).
* SlapstickKnowsNoGender: There's a lot of slapstick comedy: Gretchen getting hit in the head by a ball, Cady tripping and falling into the garbage can, Regina getting hit by a bus, Karen alone trying to catch Gretchen when she was throwing herself into the crowd etc.
* ToxicFriendInfluence: Most notably, Cady becomes an AlphaBitch after hanging around them for too long. The clique isn't good for any of them, though, and a lot of their awful behavior is egged on by each other, or done to either spite or impress one another, depending on the situation. [[spoiler:After the Plastics break up, they're all much better off.]]
* WithFriendsLikeThese: Except for [[HeterosexualLifePartners Gretchen and Karen]], towards one another.

[[folder: Cady Heron]]

!!Cady Heron (Creator/LindsayLohan)

-->'''Cady:''' ''Calling somebody else fat won't make you any skinnier. Calling someone stupid doesn't make you any smarter. And ruining Regina George's life definitely didn't make me any happier. All you can do in life is try to solve the problem in front of you.''

[[caption-width-right:250:"I know it looked like I was being a [[AlphaBitch bitch]], but that's only because I was ''[[BeneathTheMask acting]]'' [[BecomingTheMask like a bitch."]]]]

* AbhorrentAdmirer: Regina tries to invoke this trope, wanting Aaron to think that Cady is [[StalkerWithACrush really obsessed with him in a really creepy, almost insane way]] so he would think she's nuts and lose his interest in her.
* {{Adorkable}}: Before [[TookALevelInJerkass taking a level in jerkass]], this, alongside her math skills, are her main personality traits.
* AlphaBitch: After BecomingTheMask, she turns into a popular "mean girl" just like the other Plastics, even replacing Regina as the school's new Queen Bee. She gets better.
* AntiVillain: Even after she becomes the new AlphaBitch, she's still a good person at heart, and is horrified to realize how mean she's become. She gets better.
* TheAtoner: After she realizes the mess she makes, she starts doing good deeds to set things right.
* BecomingTheMask: She pretends to be an AlphaBitch to get on Regina's good side. Then she really becomes one.
* BeneathTheMask: She's just as capable of being a bitch as anyone.
* BettyAndVeronica: While still innocent and nice, she serves as the Betty to Aaron's Archie and Regina's Veronica.
* BitchInSheepsClothing: Regina and Janis claim Cady was acting like this, due to the latter "acting like she's so innocent.
* CharacterDevelopment: Starts out as a [[NaiveNewcomer Naive Newcomer]], becomes the [[AlphaBitch Alpha Bitch]] but by the end of the film she is shown to have dropped her naive and easy-to-influence side as well [[TookALevelInKindness as her bitchiness]] and reached a healthy level of confidence now.
* DidIJustSayThatOutLoud: The "word vomit" is a recurring problem for her.
* DiggingYourselfDeeper: Cady refers to this as "word vomit" and can't help herself once it starts.
* EatingLunchAlone: On her first day at school, she ends up eating lunch in a bathroom stall because she doesn't know anyone. After everything blows up in her face, she eats lunch in the bathroom again because ''everyone'' knows her, and they hate her.
* FieryRedhead: Mostly after she TookALevelInJerkass. She has a nasty temper and is willing to turn it on people.
* FisherKingdom: Staying too long amongst the Plastics causes her to start acting like them and becoming a snob.
* FishOutOfWater: To the point where Regina describes her as both "like a Martian" and "socially retarded and weird."
* FromNobodyToNightmare: From an awkward NaiveNewcomer to the school's AlphaBitch.
* GoodWithNumbers: Math is her favorite subject and she even joins the the maths geeks as a mathlete.
* HeelFaceRevolvingDoor: Over the course of the film, the friendly and good-hearted Cady usurps Regina's position and becomes the mean-spirited AlphaBitch of the school. She goes through a subsequent HeelFaceTurn when she's confronted with her actions.
* HeWhoFightsMonsters: After a while, Cady is no longer pretending to be like the plastics, she's genuinely acting like one.
* HomeSchooledKids: Until the beginning of the movie, Cady had never gone to a regular school and had been homeschooled since she was around four years old.
* TheMole: Janis convinces her to infiltrate the Plastics so she can spy on Regina and take petty revenges on her.
* MyGodWhatHaveIDone: When she realizes she's become just as cruel and horrible as the other Plastics.
* NaiveNewcomer: She has no clue how to function or fit into the social climbs of highscool. She's taken under Janis's wing, and then Regina's.
* NerdsAreSexy: Zigzagged. Kevin hits on her because of her looks ''and'' her math skills (though he later claims he prefers more "exotic" ladies). Regina and Damian both tell her joining the Mathletes is social suicide and she dumbs herself down to impress Aaron (although Aaron likes her just fine, math skills and all).
* NiceGirl: Before she becomes the new AlphaBitch she's pretty friendly. In the end she finds her good natured self again.
* NoSocialSkills: Being homeschooled on a different continent makes for a serious lack of understanding how high school politics work.
* ObfuscatingStupidity: She pretends to be terrible at math so that she can study with Aaron.
* ThePawn: For Janis to use to ruin Regina George's life.
* SingleGirlSeeksMostPopularGuy: She develops a crush on Aaron, one of the most popular and handsome guys in the school.
* TheStarscream: To Regina, to the point of becoming the new AlphaBitch.
* TookALevelInJerkass: The more she spends time with the Plastics. Could also count as CorruptTheCutie.
* TragicHero: Actually manages to be a near-textbook example.
* UnkemptBeauty: Downplayed. While she clearly fits the bill as her original, {{Adorkable}} self (Lindsay Lohan at her peak is one regulation hottie, people), opinions about her questionably UnnecessaryMakeover are split. More specifically, when Cady first appears, she keeps her hair in a [[TomboyishPonytail messy ponytail]], uses minimal makeup, and wears a baggy shirt and jeans, none of which are quite enough to conceal her natural beauty but which give the impression that either she doesn't particularly care about her appearance or she isn't aware of just how pretty she is.
* VengeanceFeelsEmpty: Reaches this conclusion at the end. Ruining Regina's life did not give her any real happiness, nor did it solve any of her problems.
* WhatTheHellHero: As Cady becomes more and more Plastic, more and more of her actions veer into "What a bitch" territory.

[[folder: Regina George]]

!!Regina George (Creator/RachelMcAdams)
[[caption-width-right:250:"You know what people say about you? They say that you're a homeschooled jungle freak who's a less hot version of me!"]]
-->'''Janis''': ''And evil takes a human form in Regina George. Don't be fooled because she may seem like your typical selfish, back-stabbing slut faced ho-bag, but in reality, she's so much more than that.''
-->'''Damian''': ''She's the queen bee - the star, those other two are just her little workers.''

* AlphaBitch: The leader of the Plastics and a fearsome one to boot!
* AntiVillain: She's definitely a bitch, and is easily the worst of the Plastics, but she's also a teenager with her own issues. By the end of the movie, she seems to be working through them, and is both happier and a better person for it.
* AttentionWhore: She's subtler about it than Gretchen, but Regina clearly wants all eyes on her at all times, and dislikes it when Gretchen appears to be trying to upstage her.
* BackhandedCompliment: She actually admits to Cady that if the Spring Fling Queen is the prettiest girl in school, then it ''should'' be Karen... and then claims that no one will vote for Karen, though, "because she's such a slut."
* BettyAndVeronica:The Veronica to Cady's Betty for Aaron's Archie.
* BigBad: Presented as one by Janis. Turns out she's just one of ''many'' mean girls around, including Janis. She just simply knew how to work the system to be at the top.
* BigEater: After her weight gain due to eating Kalteen Bars, she's shown to be eating a lot in general, noticeably in her [[CutASliceTakeTheRest Cut A Slice Take The Rest]] seen. Her meal tray is also overladen with food which contains a bag of chips, while the other Plastics have an apple and a Diet Coke.
* BitchInSheepsClothing: Although she doesn't bother with it for long, she can ''seem'' nice enough at first if she wants to.
* BookDumb: She doesn't appear to do too well in school and comes off as somewhat vapid. But when it comes to social standing, manipulation, cliques, and popularity, Regina is practically a genius.
* BrilliantButLazy: Imagine all she could achieve if she put as much effort into her schoolwork and learning as she does in controlling the student body.
* ButtMonkey: Regina George, the butt of all of Cady's tricks and pranks. [[{{Jerkass}} She probably deserves it, though.]]
* CharacterDevelopment: The ending implies she's mellowed somewhat, and is on her way to becoming a nicer person. More pronounced in the deleted scenes, where she forgives Cady and the two part ways as friends.
* TheChessmaster: Comes up with her plan to get revenge on Cady and throw the entire school into chaos in the course of one screaming car ride home.
* CrocodileTears: Regina sheds these to Principal Duvall when she turns in the Burn Book and shows him what the other girls "wrote" about her and the female student body.
* DeadpanSnarker: She gets a few passive-aggressive, snide comments in. "So you can go shave your back now.".
* DumbBlonde: Subverted. She's vapid, unacademic and shallow, but she is ''not'' dumb on a social level.
* EvilIsPetty: Cady not inviting her to her party is a big deal for her, even though she gave Cady a very good reason not to.
* EvenTheGirlsWantHer: Some of the devotion showed by other girls borders on LesYay. She starts a rumor (albeit an untrue one) that Janis had a huge crush on her.
* EveryoneLovesBlondes: The AlphaBitch who everyone worships is a blonde, of course. Though she's not ''quite'' as loved as she thinks.
* TheFriendNobodyLikes: Regina becomes this to the other Plastics before getting kicked out by Gretchen, "You can't SIT WITH US!!!".
* GirlyGirlWithATomboyStreak: For most of the movie she's a fashionable queen bee obsessed with her appearance and social status. However at the end she joins the Lacrosse Team and turns out to be very good at it. It was her therapist's idea for her to start playing sports and let all of her anger out on the field.
* HeelFaceTurn: At the end. The Plastics are disbanded, and Regina joins the field hockey team -- and seems to be ''much'' happier for it. Helps that the other girls aren't afraid of her.
* HiddenDepths:
** Oddly enough, she seemed genuinely surprised and hurt when she realizes how much her schoolmates and even her teachers dislike her.
** In the musical, she seems to genuinely believe she was helping Cady out, helping her survive by making her Plastic, and a large part of her fury over the whole "made her gain weight and lose Aaron" thing stems from that. As she puts it, "This is what I get for helping." And she sings this lyric while she's alone, which indicates that she really does feel this way.
* {{Hypocrite}}: Criticizes Cady for "acting so innocent". This is coming from the resident BitchInSheepsClothing who says a girl's skirt was 'effin' ugly.
* {{Jerkass}}: In the beginning to the middle of the movie. She then becomes a...
* JerkWithAHeartOfGold: At the near end of the film. Shows shades of this during her PetTheDog moments.
* KickTheDog:
** Clamjamming Cady with Aaron was a colossal dick move which is the tipping point that motivates Cady to conspire against her under Janis Ian's guidance.
** Framing the other Plastics to save her reputational ass.
** Calling Karen a slut behind her back. Notably, Karen was ''really'' hurt by this.
* KickTheSonOfABitch: Gives [[JerkJock Jason]] an epic putdown, in her EstablishingCharacterMoment to boot.
* LargeHam: Creator/RachelMcAdams was clearly [[HamAndCheese having fun]] playing the [[AttentionWhore attention-loving]], loud, evil Regina.
* LaserGuidedKarma: She later gets hit by a bus for her bad behavior throughout the movie.
* LovableAlphaBitch: Post-HeelFaceTurn she's more approachable (made much more apparent in the original script.)
* MemeticBadass: An in-universe example. Not content with being a BadassInCharge of the Plastics, she's also an in-universe {{Memetic Sex God}}dess, as everyone seems to want a piece of her.
* ManipulativeBitch: She's extremely skilled at twisting people's words and actions to get what she wants, or even just a cheap laugh.
* MeaningfulName: "Regina" means "queen". King George III was also a famously insane king.
* {{Narcissist}}: Regina shows many traits of narcissism such as: seeing herself as superior to her classmates (when really, nobody liked her), treating others like crap to make it to the top (backstabbing the other Plastics), valuing her appearance a lot, and lacking empathy for others (except herself, of course).
* PetTheDog: A couple times, she does things that are oddly nice, given her character... in her own, manipulative AlphaBitch way. When she first meets Cady, she rescues her from a creepy guy that's making a rather lecherous joke (albeit by telling him 'he can go shave his back now'), and when Gretchen sees her crush interacting with another girl and is obviously really torn up about it, Regina gets the girl out of the way by calling the girl's mother and pretending to be a Planned Parenthood doctor for no other apparent reason than to make Gretchen feel better.
* PoliticallyIncorrectVillain: The reason for her falling out with Janis Ian -- she thought Janis was gay and didn't want her around anymore after that. She also has no qualms about using the word "retarded" when she means "stupid." (Although that attitude wasn't the ''least'' bit uncommon in 2004, unfortunately.)
* RichBitch: Huge house, endless wardrobe, cute convertible and is one of the meanest girls in the film.
* RichInDollarsPoorInSense: Regina's a specific example. She could rattle off several mostly-illegal weight loss drugs (most of which either were expensive before being banned or would be expensive to ship from countries where they're still legal). Yet, she didn't know enough about health and nutrition to know whether or not butter is a carb. This is most likely a jab at the stereotype of American teenage girls wanting to get thin or in shape the fast and ''un''healthy way than through actual ''healthy'' living.
* ShroudedInMyth: An interview montage with other students and even some faculty highlights the silliest myths and rumors about how cool/mean Regina is.
* SmugSnake: Regina is ''damn'' proud of every little manipulation that she pulls off and was so proud of herself she did not anticipate Janis or Cady having the audacity to plot against her.
* SpoiledBrat: She regularly tells her mother to shut up or leave her alone. She also has the master suite in her house because she forced her parents to switch rooms with her.
* StrollingThroughTheChaos: During the now-iconic hallway brawl, Regina stands in the middle of the chaos, watching and looking ''very'' proud of herself.
* TechnicalVirgin: Apparently, she was "half a virgin" when she met Aaron. Make of that what you will.
* TokenEvilTeammate: The only one of the titular Mean Girls who is a ''true'' Mean Girl. Gretchen and Karen aren't that bad, and Cady's bitchy behaviour is mostly the result of Regina's ToxicFriendInfluence but she is still a good person at heart and gets better after her HeelRealization.
%%* TheGlovesComeOff: When finally striking back against Cady.
* TwistingTheWords:
--> '''Regina''': "You're, like, really pretty."
--> '''Cady''': "Thanks."
--> '''Regina''': "So you agree?"
--> '''Cady''': "What?"
--> '''Regina''': "You think you're really pretty?"
* TwoFirstNames: "George" is more common as a first name, though using it as a surname isn't unheard of.
* VillainousBreakdown: Two significant ones towards the end:
** When she realizes that Cady deliberately made her gain weight. But then she recovers almost immediately and turns right back into TheChessmaster.
** After Janis humiliates her in front of the school by revealing her ploy with Cady, Regina viciously snaps at Cady when the latter tries to apologize. This time, it is cut short [[spoiler: [[LookBothWays by a school bus]]]].
* VillainousValor: You have to admit her scheme near the end was an awesome comeback to her initial humilations from Cady and Janis.
* WeightWoe: She wants to lose a few pounds, despite the fact that she's a) gorgeous, and b) rather thin already. Cady exploits this.

[[folder: Gretchen Wieners]]

!!Gretchen Wieners (Creator/LaceyChabert)
[[caption-width-right:250:"That is so fetch!"]]
-->'''Janis''': ''Gretchen Wieners knows everybody's business, she knows everything about everyone.''
-->'''Damian''': ''That's why her hair is so big, it's full of secrets.''

* AntiVillain: She's a Plastic, but she seems to be more shallow, desperate for attention and affection, and incredibly insecure than actually mean.
* AttentionWhore: She just wants people to like her as much as they like Regina.
* BareYourMidriff: Most of her tops show off her belly button. How she gets away with this at school is anyone's guess.
* BeneathTheMask: Gretchen seems to admire Regina at first and also appears happy about being her [[BetaBitch friend]]. Later it's revealed that she's a StepfordSmiler and secretly miserable about their [[WithFriendsLikeThese so called friendship and being treated poorly by Regina.]]
* BetaBitch: She appears to be this to Regina initially, being the ProfessionalButtKisser and parroter of the plastic "rules".
* CatchPhrase: She desperately wants to start one: "That is so fetch!"
* EveryoneIsChristianAtChristmas: Despite the fact that Gretchen's Jewish, she performs Jingle Bell Rock, which is a Christmas song, with the other Plastics every year for the Winter Talent Show. [[FridgeBrilliance This makes perfect sense, though]]. Gretchen practically kowtows to Regina -- if Regina wants her to dance to a Christmas song, then Gretchen will dance to a Christmas song. And to be honest, "Jingle Bell Rock" is not exactly a Christmas carol - there's little Christian imagery in that song.
* ExtremeDoormat: She is extremely submissive and lives to do Regina's bidding. Even after the breakup of the Plastics, she doesn't seem to be able to function without someone to tell her what to do, and finds another queen bee to serve.
* ForcedMeme: Gretchen tries to make "fetch" into a cool slang term, using it constantly in conversations.
-->'''Regina:''' Gretchen, stop trying to make "fetch" happen! It's not going to happen!
* GossipyHens: She's the gossip queen, see the quote above.
* HeelFaceTurn: At the end. Sort of. She joins another GirlPosse, but without Regina around, she's not particularly mean.
* HeterosexualLifePartners: With Karen. Karen and Gretchen seem to have genuine affection for each other. Rather than trying to embarrass Karen for not knowing the cousin thing, Gretchen instead quietly explains it to her - and immediately lets her know when Regina calls her a slut. Karen's also the only one who catches Gretchen after her BackhandedApology.
* HiddenDepths: She confesses to Cady that she's secretly miserable as Regina's friend and has to pretend to like and not like certain things in order to gain Regina's approval.
* InferioritySuperiorityComplex: She comes off as vain, but most of her problems stem from being incredibly insecure.
* InformedJudaism: At one point, she mentions receiving Hanukkah presents from her parents.
* JewishAmericanPrincess: Not just any JAP - her father invented toaster strudel.
* LovableAlphaBitch: She's only really mean when doing Regina's bidding, or when she's getting back at Regina for hurting her feelings. She's a genuinely good and sweet friend to Karen, and is fairly nice to Cady for the most part. Mostly, she just seems to be desperate for attention and for people to like her, and more neurotic and cripplingly insecure than anything.
* MinionWithAnFInEvil: Not as much as Karen, but still rather incompetent in bitchiness and actually seems [[LovableAlphaBitch fairly nice]].
* MixedAncestry: She's Jewish, but joins the Cool Asians at the end of the movie.
* {{Neologizer}}: Primarily in the form of "fetch". Which will never catch on.
* NervousWreck: Insecure, neurotic and always really close to a breakdown.
* ThePratfall: Performs one when the crowd in the "circle of trust" refuses to catch her, [[HeterosexualLifePartners except for Karen.]]
* ProfessionalButtKisser: To Regina.
* ProudBeauty: She acknowledges her beauty when she "apologizes" to the other girls for her behavior.
* ScrewTheRulesIHaveMoney: Gretchen's ticket into the Plastics is that she's rich. When they get called to the principal's office for the burn book, she specifically tries to use her money and her father's notoriety to get out of trouble.
* SoBeautifulItsACurse: "I'm sorry that people are so jealous of me. But I can't help it that I'm popular."
* StepfordSmiler: Gretchen seems to be happy as Regina's second in command, but as Cady begins to chip away her facade we see a nervous mess that is just one more slight away from a full breakdown.
* VillainousBreakdown: '''"WE SHOULD TOTALLY JUST''' '''''STAB CAESAR!!!"'''''
* VillainousFriendship: She's best friends with Karen, and actually genuinely likes her, not just fear her like she does Regina. She also seems to like Cady as a friend, confiding in her at one point and for the most part being nice to her. Though maybe this isn't that surprising, given that Gretchen's a MinionWithAnFInEvil.
* YesMan: At first to Regina, then Cady, and finally finds a new Queen Bee at the end of the movie, Trang Pak.

[[folder: Karen Smith]]

!!Karen Smith (Creator/AmandaSeyfried)
[[caption-width-right:250:"So if you're from Africa... why are you white?"]]
-->'''Janis''': ''That one there, that's Karen Smith. She is one of the dumbest girls you will ever meet. Damian sat next to her in English last year.''
-->'''Damian''': ''She asked me how to spell orange.''

* AdvertisedExtra: Karen doesn't have that large of a part (especially compared to the other three plastics) and has little impact on the plot, but is featured in all of the advertisements because she is a Plastic and thus one of the Mean Girls.
* AntiVillain: She's barely a villain at all -- she's a member of the Plastics and does what Regina (and later Cady) tells her to do, but she's kind, sweet, and optimistic.
* BrainlessBeauty: One of the iconic examples. Karen is one of the most beautiful girls in school, but she's also one of the dumbest.
* {{Cloudcuckoolander}}: She's convinced she has psychic powers... you know, a fifth sense? ESPN? Well, at least her boobs do. They can predict when it's going to rain... well when it ''is'' raining.
* TheDitz: Stands in the rain, feeling her breasts (see InformedAbility below), and declares that "there's a 30% chance that it's already raining!" With complete sincerity.
* DumbBlonde: A classic example with shades of old Marilyn Monroe roles where she's just as sweet as she is dumb.
* DumbIsGood: She's the nicest member of the Plastics, but also the dumbest.
* EveryoneLovesBlondes: She's a member of the school's ruling clique, and has no problem finding male attention. Regina even acknowledges that Karen's prettier than her at one point (in her usual backhanded fashion, of course).
* GoodBadGirl: She is one of the nicest characters but it's implied that she ReallyGetsAround. In the musical, she gets a whole song celebrating the SexyWhateverOutfit and how much fun it is to dress up in them.
%%* HeelFaceTurn: At the end.
* HairOfGoldHeartOfGold: She has light blonde hair, and a sweet, sunny disposition.
* HeterosexualLifePartners: With Gretchen. Karen and Gretchen seem to have genuine affection for each other. Rather than trying to embarrass Karen for not knowing the cousin thing, Gretchen instead quietly explains it to her - and immediately lets her know when Regina calls her a slut. Karen's also the only one who catches Gretchen after her BackhandedApology.
* HiddenDepths: At one point in the musical, she indicates that, while she likes dressing up all sexy and having fun with boys, she does ''not'' like that this results in people treating her like a sex object. She then comments that maybe people should start teaching their sons not to treat girls like that in the first place.
-->''I'm actually a human being, and not a prop!''
* InformedAbility: Apparently, her breasts can tell when it's going to rain. Or at least, when it's ''already'' raining. And even then, she's not ''completely'' sure, even if she's actually OUTSIDE in the rain.
* InnocentBlueEyes: She has huge light blue eyes and is by far the nicest Plastic. Subverted since she isn't innocent when it comes to [[GoodBadGirl sexual things]], but she has a [[ThePollyanna sweet and optimistic personality.]]
* KindHeartedSimpleton: While she's not the smartest, she's set up as the nicest Plastic even before her HeelFaceTurn.
* KissingCousins: Gretchen is highly disturbed when Karen boasts about what a good kisser her own cousin is.
-->'''Karen''': You know who's looking fine tonight? Seth Mosakowski.
-->'''Gretchen''': Okay, you did not just say that.
-->'''Karen''': What? He's a good kisser.
-->'''Gretchen''': He's your cousin.
-->'''Karen''': Yeah, but he's my first cousin.
-->'''Gretchen''': Right.
-->'''Karen''': So, you have your cousins, and then you have your first cousins, and then you have your second cousins...
-->'''Gretchen''': No, honey, uh-uh.
-->'''Karen''': That's not right, is it?
-->'''Gretchen''': That is ''so'' not right.
* MinionWithAnFInEvil: There doesn't see to be a mean bone in her body. When she does unkind things, she's usually just following the lead of one of the other girls.
* OOCIsSeriousBusiness: Karen is mostly seen [[PerpetualSmiler smiling]] and is along with Gretchen a loyal follower of the queen bee but she does get really upset and hurt at Regina calling her a slut.
* PerpetualSmiler: Moments she isn't smiling are incredibly short lived.
* ThePollyanna: As well as being the least malicious Plastic she's easily the happiest too, lacking Regina's rage, Gretchen's crippling neuroses, or Cady's need to fit in. She's even aware of (and comfortable with) the knowledge she's not very bright.
* ReallyGetsAround: Somewhat of an InformedFlaw, but she has a reputation and is perfectly willing to hook up with her cousin.
* SatelliteCharacter: She's not as fleshed out a character as the other Plastics, she mostly just rounds out the PowerTrio and provides comic relief.
* TokenGoodTeammate: She is the only one who isn't mean-spirited and did things out of naivete rather than malice.
* VillainousFriendship: She and Gretchen are best friends and clearly care a lot for one another. [[MinionWithAnFInEvil Though they barely even count as villains, anyway.]]
* WhoWearsShortShorts: Wears a dangerously hot example in her EstablishingCharacterMoment.

!Other Students

[[folder: Janis Ian]]

!!Janis Ian (Creator/LizzyCaplan)

[[caption-width-right:250:"There are two kinds of evil people in this world. Those who do evil stuff and those who see evil stuff being done and don't try to stop it."]]
-->'''Cady''': ''You know what? You're the one who made me like this so you could use me for your 8th grade revenge!''
-->'''Janis''': ''God! See, at least me and Regina George know we're mean! You try to act so innocent like, "Oh, I use to live in Africa with all the little birdies, and the little monkeys! [...] you are a [[TitleDrop mean girl!]] You're a bitch!''

* AmbiguouslyGay: Is Janis Ian a lesbian? Nope! She's ''Lebanese''. In the musical this is played more straight where Janis never denies the lesbian rumor and actually sort of infers it's true. However, we never actually get confirmation on this.
* ArsonMurderAndJaywalking: When she gives her "apology" to Regina in front of the girls she exposes that she developed a plan with Cady to ruin Regina's high school life, that Cady turned Gretchen and Karen against Regina, that Cady made out with Aaron Samuels then convinced him to break up with Regina, all before revealing... they gave Regina foot cream for face wash. Surprisingly that last one brings out the most angry look from Regina.
* AtLeastIAdmitIt: As the character quote above shows, Janis knows she's just as manipulative and mean as Regina and doesn't try to hide that.
* TheBadGuyWins: Whether she can be considered bad or not is debatable, she does get back at Regina in the end and does it ''spectacularly''.
* BrainyBrunette: She's smart, quick-witted, and cunning.
* BerserkButton: Bringing up the fact that Regina spread rumors of her being a lesbian.
* TheChessmaster: Janis masterminded a plan to ruin Regina George's life using Cady as ThePawn to do so.
* CoolLoser: Justified. She's good looking, smart, and funny but her reputation was destroyed by a rumor and she now willingly embraces outsiderdom. The producers were actually reluctant to cast Lizzy Kaplan as Janis because they thought she was too pretty for the role but settled by giving her a goth/alternative look that would justify the popular girls avoiding her.
* DeadpanSnarker: And how! ''Everything'' she says is snarky.
* DirtyCoward: Uses Cady as a social human shield in her "eighth grade revenge" against Regina because she couldn't take her head-on.
* EvilIsPetty: She uses Cady to take petty revenge on Regina, [[DirtyCoward as opposed]] to just confronting her upfront.
* FallenPrincess: Janis used to be popular, but her reputation was destroyed by a rumor and she now willingly embraces outsiderdom.
* FormerFriendOfAlphaBitch: She was good friends with Regina in middle school, until Regina started dating and they began fighting.
%%* HeelFaceTurn: At the end.
* {{Hypocrite}}: With a side-dish of NeverMyFault in terms of influencing Cady
* HypocriticalHeartwarming: She teases Damian plenty, but will get pissed off if someone else does it. Lampshaded; she outright says calling Damian "too gay to function" is only okay when ''she'' says it.
* ImportantHaircut: Offscreen. After Regina spread the rumor in middle school that Janis was a lesbian, Janis dropped out of school for the rest of the year; when she returned in the fall, "all her hair was cut off, and she was totally weird."
* JerkWithAHeartOfGold: She can be just as spiteful, petty and cruel as Regina herself. However, she's also a genuinely loyal friend and will help you when you need it.
* KarmaHoudini: Janis, despite influencing and encouraging Cady to join the Plastics specifically to damage Regina, gets zero comeuppance when she reveals it to the entire crowd of girls following the revelation of the Burn Book. However, in the musical she does actually admit that it was wrong and that she was just as guilty.
* ManipulativeBitch: Janis convinces Cady to join the Plastics just so she can get information from them.
* MasculineGirlFeminineBoy: Masculine Girl to Damian's Feminine Boy.
* NeverMyFault: Cady does call Janis out for using her in her personal vendetta. Janis doesn't really own up to it.
* NotSoDifferent: Aside from her JerkWithAHeartOfGold tendencies and her justified vendetta against Regina, [[YouAreWhatYouHate she's just as spiteful and manipulative as she is when it comes to Cady]].
* NWordPrivileges: She calls Damian too gay to function and only she can say it but [[spoiler: [[SubvertedTrope it's because they are friends not that she is gay]]]]
* PayEvilUntoEvil: Her plan to take down Regina consists of this. She hatches a plan of revenge against Regina for some past slight, using Cady as the infiltrator.
* PlatonicLifePartners: With Damian. They are best friends almost always seen together.
* SelfFulfillingProphecy: Regina spread the rumor that Janis was obsessed with Regina. The rumor caused Janis to lose her former friends and become an outcast, which made her hate Regina...which caused her to become obsessed with Regina.
* TheSnarkKnight: No one is safe from her razor sharp snark, not even her BFF Damian.
* ToughLove: Her speech to Cady about the latter BecomingTheMask is arguably this. While it was pretty harsh for Janis to call Cady a bitch especially after manipulating her, Janis telling Cady about herself is what helped Cady see the error of her ways and revert back to her old self.
* ToxicFriendInfluence: Not as much as the Plastics, but she has a hand in Cady's transformation, too.
* UngratefulBastard: Not particularly considerate of the risk [[NaiveNewcomer Cady]] went through to infiltrate the plastics and fight Janis' war for her, as the villainous breakdown below demonstrates.
* VillainousBreakdown: When she realizes that Cady has [[BecomingTheMask become the mask]] and has thus escaped her influence.

[[folder: Damian]]

!!Damian (Daniel Franzese)
[[caption-width-right:250:"And I want my pink shirt back. I WANT MY PINK SHIRT BACK!"]]
-->'''Damian''': ''"Too gay to function?"''
-->'''Janis''': ''Hey! That's only OK when ''I'' say it.''

* AmbiguouslyBi: Sure, Damian is [[CampGay too gay to function]] but his [[AlmostKiss Almost Kiss]] with Janis can make one question his sexuality.
* CampGay: Damian is "too gay to function," though to be fair he's only ''mildly'' flamboyant.
* DeadpanSnarker: He's a typical, snarky, gay best friend.
* TheDragon: To Janis. He helps Janis with her schemes against Regina.
* GayBestFriend: To Janis, he's her closest friend and she describes him as "too gay to function".
* HaveIMentionedIAmGay: Too gay to function, to be specific. However, it's only funny when Janis says it.
* LargeHam: "AND I WANT MY PINK SHIRT BACK!!" And there's his proud and determined performance of "Beautiful".
* MasculineGirlFeminineBoy: Feminine Boy to Janis' Masculine Girl.
* NiceGuy: He's one of the few genuinely nice people in this movie (though he can let out a sassy line).
%%* PaperThinDisguise: A RunningGag.
* PlatonicLifePartners: With Janis. They are best friends almost always seen together.
* SatelliteCharacter: He's really only ever seen with Janis, and most of his character tropes are centered on the fact that he's her friend.

[[folder: Aaron Samuels]]

!!Aaron Samuels (Jonathan Bennett)
[[caption-width-right:350:"Your face smells like peppermint!"]]

* BettyAndVeronica: He's the Archie while Cady and Regina are Betty and Veronica respectively.
* BigManOnCampus: He's reasonably popular himself and is a nice guy.
* BookDumb: In contrast to Cady, Aaron is actually terrible at math, but he doesn't act like a BrainlessBeauty or DumbJock and actually seems to be a fairly level-headed person.
* LovableJock: He's on the swim team and a is a nice person.
* LoveInterest: Cady's of course as much of the film's conflict is about Regina and Cady pining after him!
* MrFanservice: Cady and Regina certainly think so.
* NiceGuy: One of the few genuinely nice people in North Shore High. Though he is definitely not a doormat.
* OnlySaneMan: Refuses to get caught up in most of the drama, and is turned off by Cady's transformation into a Regina clone.
* PrettyBoy: Cady can't help but gush over how cute he is. If it wasn't his cuteness Cady explicetely pointed out a few times, he could also qualify as a {{Hunk}}, considering his athletic built.
* SatelliteLoveInterest: All we know about him is that he's cute, sucks at math, used to date Regina, and "all he cares about is school and his mom and his friends". He gets fleshed out a little more in the original screenplay, which has a scene where he does his laundry with Cady and explains that he helps out with housework because it's just him and his mom.

[[folder: Other students]]

* CasanovaWannabe: Kevin's behaviour comes off as very similar to [[Series/TheBigBangTheory Howard Wolovitz's]], but surprisingly, he turns out not to be interested in Cady. [[spoiler:And he does succeed with Janis in the end]].
* GirlPosse: The Cool Asians count as well.
* HandsomeLech: Jason seems to be fairly popular, having one of the Plastics have a colossal crush on him and dating another pretty girl. Anytime he opens his mouth, you really wonder how that happened.
* HotForTeacher: Trang Pak and one of her friends both date Coach Carr.
* NerdsAreVirgins: One of the reasons why Ms Norbury wants Cady to join the mathletes is because she wants their members to meet a girl, as she jokingly says.
* UnderstandingBoyfriend: Shane Oman doesn't get much characterization, but he puts up with surprisingly big amount of Regina's shit. At one point he just gets demoted from Regina's boyfriend to her lover, so she can ''officially date another boy for status purposes'' and later returns to being her boyfriend and remains so even after she loses her status.
* UnwittingInstigatorOfDoom: Shane accidentally sets the ending into motion, since he's the one that tells Regina what Kalteen Bars actually do.



[[folder: Ms Sharon Norbury]]

!!Ms. Sharon Norbury (Creator/TinaFey)

[[caption-width-right:250:"You girls have got to stop calling each other sluts and whores, because if you do, it makes it okay for ''guys'' to call you sluts and whores."]]
-->'''Ms. Norbury''': ''I know having a boyfriend might seem like the only thing important to you right now, but you don't have to dumb yourself down in order for a guy to like you.''

* BrainyBrunette: She's the school's math teacher.
* BrokenBird: She's fresh off a divorce and you can see she's still fragile from it.
* CoolTeacher: She's young and genuinely cares about her students. Once Cady stops being a plastic, she starts realizing how cool Ms. Norbury actually is.
-->'''Cady''': ''(stating why she can't go to the dance)'' "I'm grounded."
-->'''Norbury''': "You're already out."
* ClearMyName: During the intervention, she confronts Cady and asks if there's anything specific she would like to confess. Cady refuses. Ms. Norbury ends up the subject of a police investigation as a consequence.
* DisappointedInYou: Says this word-for-word when Cady initially refuses to admit she wrote the "drug pusher" page in the Burn Book.
* DroppedGlasses: Happens after someone bumps her while she's trying to break up the fights where they inevitably get stepped on.
%%* CreatorCameo: Played by writer Creator/TinaFey.
* HotTeacher: Young and attractive, she's obviously caught Principal Duvall's eye.
* HumiliationConga: Of a very AdultFear type: she's just gone through a divorce, she works a humiliating side-job as a bartender to pay for said divorce, and every earnest attempt to help her students seems to backfire horribly, culminating in her being handcuffed and strip-searched by the police.
-->'''Mr. Duvall''': How was your summer?
-->'''Ms. Norbury''': ''(after inadvertently flashing her bra at her students while cleaning up hot coffee spilled down her front)'' I got a divorce.
-->'''Mr. Duvall''': Oh. My carpal tunnel came back.
-->'''Ms. Norbury''': [[MiseryPoker I win.]]
* {{Meganekko}}: Comes with being played by Creator/TinaFey.
* NoGoodDeedGoesUnpunished: See "HumiliationConga" above. Cady even evokes the trope by name toward the end of the film.
* ReasonableAuthorityFigure: She's a fountain of good advice for the students (even though they rarely listen to her) and she genuinely cares about both their grades, and their worth as human beings.

[[folder:Principal Duvall]]

!!Principal Duvall (Tim Meadows)
[[caption-width-right:250:"Aw, ''hell no'', I did ''not'' leave the Southside for ''this''!"]]

-->'''Principal Duvall''': ''I just wanted to say that you're all winners. And that I couldn't be happier the school year is ending.''

* BatterUp: When he discovers the students are fighting, [[LetsGetDangerous he grabs his baseball bat]] before going out and breaking up the commotion.
* BewareTheNiceOnes: He looks like he can handle himself in a fight and it's suggested he grew up a rough neighborhood.
-->"Aw ''hell'' no, I did not leave the Southside for ''this''!"
* ButtMonkey: He's the head of a school that's the ground for a war between the Plastics and Janis. Naturally, he takes a lot of shit.
* CoolTeacher: The students may not think so, but he's a very nice guy, and he breaks up the infamous hallway brawl single-handed, armed only with a baseball bat, which would've sent many other teachers running for the hills.
* DeadpanSnarker: He's the principal of a school that contains the likes of [[AlphaBitch Regina]], [[BetaBitch Gretchen]], [[TheDitz Karen]], [[ByronicHero Cady]], and [[PayEvilUntoEvil Janis]]. Sarcasm is his only hope for survival.
* LetsGetDangerous: He normally appears to be an easygoing guy, but when an all-out brawl breaks out in the hallway, he grabs a baseball bat and goes out into the thick of it to break it up himself, pulling a fire alarm and ordering all the girls into the gym. [[BewareTheNiceOnes Needless to say, no one argues.]]
* NiceGuy: He's a reasonable, friendly guy that genuinely wants the best for his students. He still has his limits, though.
* PapaWolf: Looks completely ready to beat the crap out of [[spoiler: Coach Carr, when he hears that he's been involved with students.]]
* ReasonableAuthorityFigure: He cares about his students, he just can't do the squishy girly things.
* ShipTease: Has a fairly obvious crush on Miss Norbury.
* TranquilFury: When he starts talking loud and authoritative, everyone listens up.


[[folder: Mr and Mrs Heron]]
* BumblingDad: Mr. Heron. He doesn't even know what being grounded exactly means.
* GoodParents: Cady's parents are loving towards her, and always support her.
* YouAreGrounded: Subverted as they do not know what being grounded means, but they said this for word when they find out about her failing math.