Warning! Character sheets are spoilerific.
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As a Whole
- Anti-Villain: All of them, in their own way. See their separate character folders for details.
- Blonde, Brunette, Redhead: After Cady enters, and especially after Regina leaves.
- Four-Temperament Ensemble: Cady (phlegmatic), Regina (choleric), Gretchen (melancholic), and Karen (sanguine).
- Girl Posse: They're the titular mean girls that rule the school.
- Large and in Charge: The two dominant members (Cady and Regina) are noticeably taller than the two followers (Gretchen and Karen.)
- Nice, Mean, and In-Between: In the original trio, Karen is the nicest one (if only because she's too dumb to be truly malicious), Alpha Bitch Regina is the mean one, and Gretchen is in-between (fairly nice, only acting mean under the influence of Regina). When Regina leaves, Cady briefly becomes the mean one as the new Queen Bee.
- Pink Means Feminine: The Plastics have these rules surrounding the color pink, which they must wear every Wednesday.
- Politically Incorrect Villain: They have no qualms about branding Janis a "dyke," and Regina uses the word "retarded" casually in her first on-screen conversation.
- Popular Is Dumb: 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 Book Dumb. Discussed and justified over the course of the movie - Cady, during her evolution into the Alpha Bitch, begins dumbing herself down so a boy will like her. They also state joining academic clubs like the Math Club (or "Mathletes") is "social suicide".
- Sexy Santa Dress: In their "Jingle Bell Rock" routine that they do for the Winter Talent Show (which, according to Damian, they do every year).
- Slapstick Knows No Gender: 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.
- Toxic Friend Influence: Most notably, Cady becomes an Alpha Bitch 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. After the Plastics break up, they're all much better off.
- With Friends Like These...: Except for Gretchen and Karen, towards one another.
Cady Heron (Lindsay Lohan)
- 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.
- Abhorrent Admirer: Regina tries to invoke this trope, wanting Aaron to think that Cady is really obsessed with him in a really creepy, almost insane way so he would think she's nuts and lose his interest in her.
- Alpha Bitch: After Becoming the Mask, 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.
- Anti-Villain: Even after she becomes the new Alpha Bitch, she's still a good person at heart, and is horrified to realize how mean she's become. She gets better.
- The Atoner: After she realizes the mess she makes, she starts doing good deeds to set things right.
- Becoming the Mask: She pretends to be an Alpha Bitch to get on Regina's good side. Then she really becomes one.
- Beneath the Mask: She's just as capable of being a bitch as anyone.
- Betty and Veronica: While still innocent and nice, she serves as the Betty to Aaron's Archie and Regina's Veronica.
- Bitch in Sheep's Clothing: Regina and Janis claim Cady was acting like this, due to the latter "acting like she's so innocent."
- Character Development: Starts out as a Naïve Newcomer, becomes the Alpha Bitch but by the end of the film she is shown to have dropped her naive and easy-to-influence side as well as her bitchiness and reached a healthy level of confidence now.
- Did I Just Say That Out Loud?: The "word vomit" is a recurring problem for her.
- Digging Yourself Deeper: Cady refers to this as "word vomit" and can't help herself once it starts.
- Distracted by the Sexy: Any time she sees Aaron Samuels, whom she finds utterly dreamy. Lampshaded by Ms. Norbury near the end, when she says nothing can trip Cady up during the Matholon competition because none of the boys on the opposing team are cute.
- Easily Forgiven: While Ms. Norbury understandably upset at Cady for starting the mean rumor that gets her in trouble (granted, Cady didn't really write it but claims she did), she tells Cady she's absolved just as long as she will help the school win the Mathletes contest.
- Eating Lunch Alone: 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.
- Evil Makeover: Downplayed. After being fully integrated into the Plastics, she's given a (arguably unnecessary) makeover to look more like them: unkempt hair, shiny lipgloss, and so much makeup that her skin looks shiny like plastic.
- Fiery Redhead: Mostly after she Took a Level in Jerkass. She has a nasty temper and is willing to turn it on people.
- Fisher Kingdom: Staying too long amongst the Plastics causes her to start acting like them and becoming a snob.
- Fish out of Water: To the point where Regina describes her as both "like a Martian" and "socially retarded and weird."
- From Nobody to Nightmare: From an awkward Naïve Newcomer to the school's Alpha Bitch.
- Good with Numbers: Math is her favorite subject and she even joins the maths geeks as a mathlete.
- HeelFace Revolving Door: Over the course of the film, the friendly and good-hearted Cady usurps Regina's position and becomes the mean-spirited Alpha Bitch of the school. She goes through a subsequent HeelFace Turn when she's confronted with her actions.
- He Who Fights Monsters: After a while, Cady is no longer pretending to be like the plastics, she's genuinely acting like one.
- Home Schooled Kids: 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.
- Love Makes You Dumb: Played with. Her crush on Aaron Samuels isn't strong enough to break her concentration with math (since she quickly recovers after being Distracted by the Sexy twice), but her desire to talk to him despite Regina's objections drives her to pretend to be bad at math so she'd have an excuse to talk to him. Aaron calls her out on it later, telling her that pretending to be stupid and failing on purpose is what's really dumb.
- Meaningful Name: Whenever people mispronounce her name to sound like "Catty," since she becomes a catty Alpha Bitch later.
- The Mole: Janis convinces her to infiltrate the Plastics so she can spy on Regina and take petty revenges on her.
- My God, What Have I Done?: When she realizes she's become just as cruel and horrible as the other Plastics.
- Naïve Newcomer: 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.
- Nerds Are Sexy: 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).
- Nice Girl: Before she becomes the new Alpha Bitch she's pretty friendly. In the end she finds her good natured self again.
- No Social Skills: Being homeschooled on a different continent makes for a serious lack of understanding how high school politics work.
- Obfuscating Stupidity: She pretends to be terrible at math so that she can study with Aaron.
- The Pawn: For Janis to use to ruin Regina George's life.
- Single Woman Seeks Good Man: Part of what draws her to Aaron is how kind he is. When Regina tries to "warn her" away by saying that all he cares about is his schoolwork, his friends, and his mom, Cady doesn't see the problem.
- Single Girl Seeks Most Popular Guy: She develops a crush on Aaron, one of the most popular and handsome guys in the school.
- The Starscream: To Regina, to the point of becoming the new Alpha Bitch.
- Took a Level in Jerkass: The more she spends time with the Plastics. Could also count as Corrupt the Cutie.
- Tragic Hero: Actually manages to be a near-textbook example.
- Unkempt Beauty: Downplayed. While she clearly fits the bill as her original self, opinions about her questionably Unnecessary Makeover are split. More specifically, when Cady first appears, she keeps her hair in a 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.
- Vengeance Feels Empty: 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.
- What the Hell, Hero?: As Cady becomes more and more Plastic, more and more of her actions veer into "What a bitch" territory.
Regina George (Rachel McAdams)
- 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.
- Alpha Bitch: The leader of the Plastics and a fearsome one to boot!
- Anti-Villain: She's a bitch, and the worst of the Plastics, but she's a teenager with issues. By the end of the movie, she is working through them, and is happier and a better person.
- Arch-Enemy: Is this to Janis Ian, having made her an outcast in the past.
- Attention Whore: She's subtler about it than Gretchen, but Regina wants all eyes on her, and dislikes it when Gretchen is trying to upstage her.
- Backhanded Compliment: She 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, "because she's such a slut."
- Betty and Veronica: The Veronica to Cady's Betty for Aaron's Archie.
- Big Bad: 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.
- Big Eater: After her weight gain due to eating Kalteen Bars, she's stuffing herself, noticeably in her Cut a Slice, Take the Rest scene. Her meal tray is overladen with junk food , while the other Plastics have an apple and a Diet Coke.
- Bitch in Sheep's Clothing: Although she doesn't bother with it for long, she can seem nice enough at first if she wants to.
- Book Dumb: She doesn't appear to do too well in school and comes off as vapid. But when it comes to social standing, manipulation, cliques, and popularity, Regina is a genius.
- Brilliant, but Lazy: Imagine all she could achieve if she put as much effort into her schoolwork and learning as she does in controlling the student body.
- Butt-Monkey: Regina George, the butt of all of Cady's tricks and pranks.
- Character Development: The ending implies she's mellowed and is becoming a nicer person. More pronounced in the deleted scenes, where she forgives Cady and the two part ways as friends.
- The Chessmaster: 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.
- Crocodile Tears: 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.
- Deadpan Snarker: She gets a few passive-aggressive, snide comments in. "So you can go shave your back now."
- Dumb Blonde: Subverted. She's vapid, unacademic and shallow, but she is not dumb on a social level.
- Evil Is Petty: Cady not inviting her to her party is a big deal for her, even though she gave Cady a very good reason not to.
- Even the Girls Want Her: Some of the devotion showed by other girls borders on Les Yay. She starts a rumor (albeit an untrue one) that Janis had a huge crush on her.
- Everyone Loves Blondes: The Alpha Bitch who everyone worships is a blonde, of course. Though she's not quite as loved as she thinks.
- The Friend Nobody Likes: Regina becomes this to the other Plastics before getting kicked out by Gretchen, "You can't SIT WITH US!!!".
- Girly Girl with a Tomboy Streak: 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.
- Head-Turning Beauty: She's extremely attractive and seems to attract most of the guys in school. And she's damn proud of it too.
- HeelFace Turn: 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.
- Hidden Depths:
- 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.
- In the musical, she reconciles with Cady and advises Cady to never care what other people say, implying that her Alpha Bitch front did bring her a lot of security from mean comments.
- Hypocrite: Criticizes Cady for "acting so innocent". This is coming from the resident Bitch in Sheep's Clothing who compliments a girl's skirt to her face but secretly says said girl's skirt was 'effin' ugly.
- Idle Rich: One of her many problems. She's obviously rich (living in a big house), yet has no hobbies or extra-curricular activities to fill her time besides mindless consumption (shopping at the mall) and is clearly bored with her own life, so she manipulates and spreads rumors behind other girls' backs to fill her time. Averted at the end, when her physical therapist helps her to channel her rage into sports, being in girls' lacrosse team clearly helps her mellow out.
- In-Universe Catharsis: After she is hit by a bus, her physical therapist helps her channel her rage into sports. Being able to work off all her rage in a healthy way clearly helps her mellow out, and by the end she has less energy to hurt or play games with her fellow students.
- It Amused Me: At the start of the film, she seems to enjoy manipulating and controlling the entire student body (including tormenting and spreading nasty rumors) because she's rich and bored. Post-Character Development, she seems to grow out of it.
- Jerk with a Heart of Gold: At the near end of the film. Shows shades of this during her Pet the Dog moments.
- Kick the Dog:
- 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.
- Kick the Son of a Bitch: Gives Jason an epic putdown, in her Establishing Character Moment to boot.
- Laborious Laziness:
- If she put half as much effort into her studies or hobbies as she did into manipulating her fellow classmates for a cheap laugh, she'd actually be a premier student.
- If she just ate healthily instead of coming up with convoluted diet plans to try to "cheat" her way into thinness like cranberry cocktail cleanses, using illegal weight-loss drugs, and eating junk food with "carb-burning" nutrition bars.
- Large Ham: Rachel McAdams was clearly having fun playing the attention-loving, loud, evil Regina.
- Laser-Guided Karma: She later gets hit by a bus for her bad behavior throughout the movie.
- Lovable Alpha Bitch: Post-HeelFace Turn she's more approachable (made much more apparent in the original script.)
- Memetic Badass: An In-Universe example. Not content with being a Badass in Charge of the Plastics, she's also an Lust Object, as everyone seems to want a piece of her.
- Manipulative Bitch: She's extremely skilled at twisting people's words and actions to get what she wants, or even just a cheap laugh.
- Meaningful Name: "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).
- Mistreatment-Induced Betrayal: While it was partially orchestrated by Cady and Janis, it's Regina's own continuous, horrible treatment of Gretchen and Karen that drive them to kick her out of the Plastics later. Also, Cady herself turns against Regina and plots her downfall due to Regina's unnecessary Kick the Dog moment.
- Never My Fault: Her attitude toward Janis screams this. After constantly blowing her off to be with her first boyfriend in middle school, Regina chose to believe that Janis was "weirdly jealous" of Kyle and "obsessed" with Regina rather than hurt and rightly angry at Regina being a bad friend, and after Regina started the untrue rumor that Janis was lesbian, she acts like Janis' reaction to being bullied and ostracized for it (dropping out of middle school, returning to high school in the fall, chopping off her hair, and embracing outsiderism) was Janis' own problem and not Regina's.
- Pet the Dog: A couple times, she does things that are oddly nice, given her character... in her own, manipulative Alpha Bitch 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. She's also pretty nice to her little sister, at least nicer than a character like her would normally be.
- Politically Incorrect Villain: The reason for her falling out with Janis Ian — she thought Janis was a lesbian 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.)
- Rich Bitch: Huge house, endless wardrobe, cute convertible and is one of the meanest girls in the film.
- Rich in Dollars, Poor in Sense: 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 unhealthy way than through actual healthy living.
- Shrouded in Myth: An interview montage with other students and even some faculty highlights the silliest myths and rumors about how cool/mean Regina is.
- Smug Snake: 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.
- The Social Expert: She's pretty Book Dumb, but a master at social manipulation.
- Spoiled Brat: 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.
- Strolling Through the Chaos: During the now-iconic hallway brawl, Regina stands in the middle of the chaos, watching and looking very proud of herself.
- Technical Virgin: Apparently, she was "half a virgin" when she met Aaron. Make of that what you will.
- Token Evil Teammate: 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 Toxic Friend Influence but she is still a good person at heart and gets better after her Heel Realization.
- Tomboyness Upgrade: Her Character Development at the end of the movie shows her going from a Valley Girl to a Passionate Sports Girl.
- Twisting the Words:Regina: You're, like, really pretty.
Regina: So you agree?
Regina: You think you're really pretty?
- Two First Names: "George" is more common as a first name, though using it as a surname isn't unheard of.
- Villainous Breakdown: 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 The Chessmaster.
- 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 by a school bus.
- Villainous Valor: You have to admit her scheme near the end was an awesome comeback to her initial humilations from Cady and Janis.
- Weight Woe: She wants to lose a few pounds, despite the fact that she's a) gorgeous, and b) rather thin already. Cady exploits this.
Gretchen Wieners (Lacey Chabert)
- 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.
- Anti-Villain: She's a Plastic, but she is more shallow, desperate for attention and affection, and insecure than mean.
- Attention Whore: She wants people to like her as much as they like Regina.
- Bare Your Midriff: Most of her tops show off her belly button. How she gets away with this at school is anyone's guess.
- Beneath the Mask: Gretchen seems to admire Regina at first and also appears happy about being her friend. Later it's revealed that she's a Stepford Smiler and miserable about their so called friendship and being treated poorly by Regina.
- Butt-Monkey: Im their Establishing Character Moment, a football hits her head. Not to forget her diarrhea incident at Barnes and Nobles. After her Backhanded Apology, she falls down flat on the back. Pretty dangerous, but its treated as funny. Her bad luck and low self-esteem are reasons why shes the plastic Janis wants to crack.
- Catchphrase: She desperately wants to start one: "That is so fetch!"
- Cute, but Cacophonic: She screams "you can't sit with us" in a shrill voice.
- Even Bad Women Love Their Mamas: She is complicit in Regina's bitchery to the school but her recounting of how Regina forbade her from wearing hoop earrings and her tears at having to turn down a beautiful pair her parents once got her for Hanukkah seems to betray some guilt about possibly prioritizing her parents' feelings over Regina's wants.
- Everyone Is Christian at Christmas: 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. This makes sense, though. Gretchen kowtows to Regina — if Regina wants her to dance to a Christmas song, Gretchen will dance to a Christmas song. And to be honest, "Jingle Bell Rock" is not a Christmas carol - there's no Christian imagery in that song. Also, a lot of real-life Jews celebrate Christmas (at least externally) with their gentile friends.
- Extreme Doormat: She is submissive and lives to do Regina's bidding. Even after the breakup of the Plastics, shes unable to function without someone to tell her what to do, and finds another queen bee to serve.
- Forced Meme: Gretchen tries to make "fetch" a cool slang term.Regina: Gretchen, stop trying to make "fetch" happen! It's not going to happen!
- Gossipy Hens: She's the gossip queen, see the quote above.
- HeelFace Turn: At the end. She joins another Girl Posse, but without Regina around, she's not mean.
- Heterosexual Life-Partners: With Karen. Karen and Gretchen have genuine affection for each other. Rather than trying to embarrass Karen for not knowing the cousin thing, Gretchen 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 Backhanded Apology.
- Hidden Depths: She confesses to Cady that she's miserable as Regina's friend and has to pretend to like and not like certain things in order to gain Regina's approval.
- Ignored Epiphany: Her big song in the musical, "What's Wrong With Me?", gives her a heartbreaking one. Towards the end of the song, which is about her toxic friendship with Regina and her crippling insecurity, she briefly wonders if maybe Regina is the problem... but immediately backtracks and comments, "It's probably me."
- Inferiority Superiority Complex: She comes off as vain, but her problems stem from being incredibly insecure.
- Informed Judaism: At one point, she mentions receiving Hanukkah presents from her parents.
- Innocent Beta Bitch: She's only mean when doing Regina's bidding, or when she's getting back at Regina for hurting her feelings. She's a good and sweet friend to Karen, and is nice to Cady for the most part. Gretchen just seems to be desperate for attention and for people to like her, and more neurotic and cripplingly insecure than anything.
- Jewish American Princess: Not just any JAP - her father invented toaster strudel.
- Loose Lips: She kept on accidentally spilling Reginas secrets to Cady.
- Love Martyr: To Jason, who two-times her, yet she keeps fawning over him.
- Masochism Tango: Gretchen's relationship with Jason is clearly not healthy for her but that doesn't stop her from going back to him.
- Mixed Ancestry: 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.
- Nervous Wreck: Insecure, neurotic and constantly on the edge of a breakdown.
- The Pratfall: Performs one when the crowd in the "circle of trust" refuses to catch her, except for Karen.
- Proud Beauty: She acknowledges her beauty when she "apologizes" to the other girls for her behavior.
- Royalties Heir: "She's totally rich because her dad invented Toaster Strudel."
- Screw the Rules, I Have Money!: 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. Even more so in the original script, where Gretchen is described as scrawny and conventionally unattractive, so her wealth is the only reason why Regina accepts her.
- Shipper on Deck: When she believes Cady has a crush on Kevin, she seems genuinely excited and tries to set them up. She's sorely mistaken (since neither is interested in the other) but it's the thought that counts.
- So Beautiful, It's a Curse: "I'm sorry that people are so jealous of me. But I can't help it that I'm popular."
- Stepford Smiler: Gretchen seems to be happy as Regina's second in command, but as Cady begins to chip away her facade we see a Nervous Wreck that is just one more slight away from a breakdown.
- Villainous Breakdown: "WE SHOULD TOTALLY JUST STAB CAESAR!!!"
- Villainous Friendship: She's best friends with Karen, and 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 Minion with an F in Evil.
- Yes-Man: At first to Regina, then Cady, and finally finds a new Queen Bee at the end of the movie, Trang Pak.
Karen Smith (Amanda Seyfried)
- 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.
- Advertised Extra: 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.
- Anti-Villain: 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.
- The Baby of the Bunch: Despite the fact that all of the Plastics, including Cady, are presumably of the same age (16 years, to be exact), Karen can be somewhat be seen as this, largely due to the lack of genuine meanness in her, and the fact that her ditzy personality tends to occasionally make her behave rather childlike.
- Brainless Beauty: 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.
- The Cutie: Because of her rather sweet, albeit naive personality despite being a Plastic, she can be easily seen as this.
- Dark and Troubled Past: In the musical, her part in the song "Stop" reveals that a boy manipulated her into sending him a picture of her naked, and then shared it with his friends, who spread it all over the internet—when she was thirteen.
- The Ditz: Stands in the rain, feeling her breasts (see Informed Ability below), and declares that "there's a 30% chance that it's already raining!" With complete sincerity.
- Dumb Blonde: A classic example with shades of old Marilyn Monroe roles where she's just as sweet as she is dumb.
- Dumb Is Good: She's the nicest member of the Plastics, but also the dumbest.
- Everyone Loves Blondes: 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).
- Good Bad Girl: She is one of the nicest characters but it's implied that she Really Gets Around. In the musical, she gets a whole song celebrating the Sexy Whatever Outfit and how much fun it is to dress up in them.
- HeelFace Turn: During the epilogue, she's shown as the only member of the original plastics to be spending time with Cady, Janis and their new circle of friends, carefully combing the hair of one of their new friends (the wheelchair-bound girl).
- Hair of Gold, Heart of Gold: She has light blonde hair, and a sweet, sunny disposition.
- Heterosexual Life-Partners: 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 Backhanded Apology.
- Hidden Depths:
- Subverted and Played for Laughs in the original movie. Cady tries to bond with her while Regina and Gretchen are busy by asking if she has any talents, and all she can bring up is "I can stick my whole fist in my mouth" and "My breasts can tell the weather." Unsurprisingly, Caddy does not want to see a demonstration.
- 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!
- I the musical, Karen later comments on Regina's treatment of her stemming from insecurity and shows herself to be one of the most emotionally mature characters in the cast.
- Informed Ability: 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.
- Innocent Beta Bitch: 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.
- Innocent Blue Eyes: She has huge light blue eyes and is by far the nicest Plastic. Subverted since she isn't innocent when it comes to sexual things, but she has a sweet and optimistic personality.
- Kind Hearted Simpleton: While she's not the smartest, she's set up as the nicest Plastic even before her HeelFace Turn.
- Kissing Cousins: 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.
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.
- OOC Is Serious Business: Karen is mostly seen 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.
- Perpetual Smiler: Moments she isn't smiling are incredibly short-lived.
- The Pollyanna: 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.
- Really Gets Around: Somewhat of an Informed Flaw, but she has a reputation and is perfectly willing to hook up with her cousin.
- Satellite Character: She's not as fleshed out a character as the other Plastics, she mostly just rounds out the Power Trio and provides comic relief.
- Token Good Teammate: She is the only one who isn't mean-spirited and did things out of naivete rather than malice.
- Villainous Friendship: She and Gretchen are best friends and clearly care a lot for one another. Though they barely even count as villains, anyway.
- Who Wears Short Shorts?: Wears a dangerously hot example in her Establishing Character Moment.
Janis Ian (Lizzy Caplan)
- 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 mean girl! You're a bitch!
- Ambiguously Gay: 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 implies it's true. However, we never actually get confirmation on this.
- Arch-Enemy: Regina George, the Alpha Bitch who made her an outcast.
- Arson, Murder, and Jaywalking: 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.
- At Least I Admit It: As the character quote above shows, Janis knows she's just as manipulative and mean as Regina and doesn't try to hide that. There is an element of Self-Serving Memory here, however, since Janis never actually acknowledged it until Cady called her out about it in their fight.
- The Bad Guy Wins: Whether she can be considered bad or not is debatable, she does get back at Regina in the end and does it spectacularly.
- Brainy Brunette: She's smart, quick-witted, and cunning.
- Berserk Button: Bringing up the fact that Regina spread rumors of her being a lesbian.
- The Chessmaster: Janis masterminded a plan to ruin Regina George's life using Cady as The Pawn to do so.
- Cool Loser: 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.
- Deadpan Snarker: And how! Everything she says is snarky.
- Dirty Coward: Uses Cady as a social human shield in her "eighth-grade revenge" against Regina because she couldn't take her head-on.
- Emo Teen: She definitely has the looks and partially the attitude of one. Those who attended middle school in the early 2000's would recognize her as such.
- Evil Is Petty: She uses Cady to take petty revenge on Regina, as opposed to just confronting her upfront.
- Fallen Princess: Janis used to be popular, but her reputation was destroyed by a rumor and she now willingly embraces outsiderdom.
- Former Friend of Alpha Bitch: She was good friends with Regina in middle school, until Regina started dating and they began fighting.
- Hypocrite: With a side-dish of Never My Fault in terms of influencing Cady. While claiming to target Regina due to her meanness and oppressive cruelty over the school, it's pretty clear that Janis can ultimately be just as cruel and mean as Regina.
- Hypocrite Has a Point: Janis is a hypocrite, but she was right to call Cady out on Becoming the Mask.
- Hypocritical Heartwarming: 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.
- Important Haircut: 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."
- Jerk with a Heart of Gold: 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.
- Karma Houdini: 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.
- Manipulative Bitch: Janis convinces Cady to join the Plastics just so she can get information from them.
- Masculine Girl, Feminine Boy: Masculine Girl to Damian's Feminine Boy.
- Named After Somebody Famous: Shares her name with the folk singer Janis Ian.
- Never My Fault: Cady does call Janis out for using her in her personal vendetta. Janis doesn't really own up to it.
- Non-Answer: When Cady calls Janis out for making her like the Plastics to get her 8th grade revenge, Janis doesn't fully deny it, but she doesn't own up to it either, instead hedging by claiming that Regina and she at least know they're mean (even though she never admitted to it previously either)...
- Not So Different: Aside from her Jerk with a Heart of Gold tendencies and her justified vendetta against Regina, she's just as spiteful and manipulative as she is when it comes to Cady.
- N-Word Privileges: She calls Damian too gay to function and only she can say it, but it's because they are friends, not that she is gay.
- Pay Evil unto Evil: 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.
- Platonic Life-Partners: With Damian. They are best friends almost always seen together.
- Self-Fulfilling Prophecy: 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.
- Self-Serving Memory: Despite claiming in her At Least I Admit It retort to Cady that she is at least willing to acknowledge her meanness, there's an element of this going on; we've never actually seen her do so until Cady calls her out on it.
- The Snark Knight: No one is safe from her razor sharp snark, not even her BFF Damian.
- Tough Love: Her speech to Cady about the latter Becoming the Mask 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.
- Toxic Friend Influence: Not as much as the Plastics, but she has a hand in Cady's transformation, too.
- Ungrateful Bitch: Not particularly considerate of the risk Cady went through to infiltrate the plastics and fight Janis' war for her, as the villainous breakdown below demonstrates.
- Villainous Breakdown: When she realizes that Cady has become the mask and has thus escaped her influence.
Damian Leigh (Daniel Franzese)
- Damian: "Too gay to function?"
Janis: Hey! That's only OK when I say it.
- All There in the Script: His last name is never mentioned in the film.
- Ambiguously Bi: Sure, Damian is too gay to function but his Almost Kiss with Janis can make one question his sexuality.
- But Not Too Gay: At no point in the film is he shown to be romantic with, or have a crush on, any specific boy. The musical partially fixes this with the song "Stop!"
- Camp Gay: Damian is "too gay to function," though to be fair he's only mildly flamboyant.
- Deadpan Snarker: He's a typical, snarky, gay best friend.
- The Dragon: To Janis. He helps Janis with her schemes against Regina.
- Gay Best Friend: To Janis, he's her closest friend and she describes him as "too gay to function".
- Have I Mentioned I Am Gay?: Too gay to function, to be specific. However, it's only funny when Janis says it.
- Large Ham: "AND I WANT MY PINK SHIRT BACK!!" And there's his proud and determined performance of "Beautiful".
- Masculine Girl, Feminine Boy: Feminine Boy to Janis' Masculine Girl.
- Nice Guy: He's one of the few genuinely nice people in this movie (though he can let out a sassy line).
- Paper-Thin Disguise: A Running Gag. Every time he's pretending to be someone he's not (a robber stealing Cady's purse, the Secret Santa passing out candy canes, a member of the all-girl assembly) he just wears a hoody and sunglasses.
- Platonic Life-Partners: With Janis. They are best friends almost always seen together.
- Satellite Character: He's really only ever seen with Janis, and most of his character tropes are centered on the fact that he's her friend.
Aaron Samuels (Jonathan Bennett)
- Betty and Veronica: He's the Archie while Cady and Regina are Betty and Veronica respectively.
- Big Man on Campus: He's reasonably popular himself and is a nice guy.
- Book Dumb: In contrast to Cady, Aaron is actually terrible at math, but he doesn't act like a Brainless Beauty or Dumb Jock and actually seems to be a fairly level-headed person.
- Lovable Jock: He's on the swim team and a is a nice person.
- Love Interest: Cady's of course as much of the film's conflict is about Regina and Cady pining after him!
- Mr. Fanservice: Cady and Regina certainly think so.
- Nice Guy: One of the few genuinely nice people in North Shore High. Though he is definitely not a doormat.
- Only Sane Man: Refuses to get caught up in most of the drama, and is turned off by Cady's transformation into a Regina clone.
- Pretty Boy: 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.
- Satellite Love Interest: 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.
- The Beautiful Elite: The Cool Asians and the Unfriendly Black Hotties both carry off these vibes, as they are cliques of beautiful members of minority groups and carry off a similar sense of superiority.
- Casanova Wannabe: Kevin's behaviour comes off as very similar to Howard Wolowitz's, but surprisingly, he turns out not to be interested in Cady. And he does succeed with Janis in the end.
- Girl Posse: The female-dominated Cool Asians count as well.
- Girly Girl with a Tomboy Streak: The girl Jocks seem to have this vibe, outside their uniforms a few of them dress in a feminine manner (like the girl who threatens to kick Cady's ass if she mixes her up with a teacher) and are not above getting involved in the same petty things as the other girls in their school.
- Handsome Lech: 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.
- Nerds Are Virgins: 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.
- Teacher/Student Romance: Trang Pak and one of her friends both date Coach Carr.
- Unwitting Instigator of Doom: Shane accidentally sets the ending into motion, since he's the one that tells Regina what Kalteen Bars actually do.
Ms. Sharon Norbury
Ms. Sharon Norbury (Tina Fey)
- 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.
- Born Unlucky: She's convinced she's this. Considering all the bad things that happen to her before and during the film (divorced, broke from getting a divorce, crashing into Cady and having coffee spilled all over her sweater on the first day of school, breaking her glasses when the girls riot, being investigated for drugs thanks to the Burn Book... She might not be far off.
- Brainy Brunette: She's the school's math teacher.
- Broken Bird: She's fresh off a divorce and you can see she's still fragile from it.
- Cool Teacher: 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.
- Clear My Name: 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.
- Disappointed in You: Says this word-for-word when Cady initially refuses to admit she wrote the "drug pusher" page in the Burn Book.
- Dropped Glasses: Happens after someone bumps her while she's trying to break up the fights where they inevitably get stepped on.
- Creator Cameo: Played by writer Tina Fey, who also plays a major character in the movie.
- Hot Teacher: Young and attractive, she's obviously caught Principal Duvall's eye.
- Humiliation Conga: Of a very Adult Fear 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: I win.
- Meganekko: Comes with being played by Tina Fey.
- No Good Deed Goes Unpunished: See "Humiliation Conga" above. Cady even evokes the trope by name toward the end of the film.
- Reasonable Authority Figure: 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.
Principal Ron Duvall
Principal Ron Duvall (Tim Meadows)
- Principal Duvall: I just wanted to say that you're all winners. And that I couldn't be happier the school year is ending.
- Batter Up!: When he discovers the students are fighting, he grabs his baseball bat before going out and breaking up the commotion.
- Beware the Nice Ones: 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!"
- Butt-Monkey: 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.
- Cool Teacher: 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.
- Deadpan Snarker: He's the principal of a school that contains the likes of Regina, Gretchen, Karen, Cady, and Janis. Sarcasm is his only hope for survival.
- Let's Get Dangerous!: 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. Needless to say, no one argues.
- Nice Guy: He's a reasonable, friendly guy that genuinely wants the best for his students. He still has his limits, though.
- Papa Wolf: Looks completely ready to beat the crap out of Coach Carr when he hears that he's been involved with students.
- Reasonable Authority Figure: He cares about his students, he just can't do the squishy girly things.
- Screw This, I'm Outta Here!: Metaphorically, at least; he initially takes charge of the conference to allow the girls to air their grievances, intending to act as counsellor and mediator. When the very first complaint is a girl complaining about how she's targeted due to her menstrual cycle, however, he instantly realises he's completely out of his depth and hands the proceedings over to Miss Norbury.
- Ship Tease: Has a fairly obvious crush on Miss Norbury.
- That Came Out Wrong: After the entire female student body riots, he tries to help the girls "adjust their attitudes toward each other" by having a talk "lady to lady." What little does he know, a "lady problem" is usually a euphemism for "that time of the month", and when a girl predictably starts talking about her period, he quickly realizes how far out of his depth he is, and hands the reins over to Mrs. Norbury.
- Tranquil Fury: When he starts talking loud and authoritative, everyone listens up.
Coach Carr (Dwayne Hill)
- Coach Carr: At your age, you're going to have a lot of urges. You're going to want to take off your clothes, and touch each other.
Mr. and Mrs. Heron
Chip and Betsy Heron (Neil Flynn and Ana Gasteyer)
- Betsy: Where's Cady?Chip: She went out.
- Absent-Minded Professor: They are both academic sorts who have been traveling the world for their studies and homeschooling a daughter in the rural areas of Africa... and enroll her in a suburban school after barely getting acclimated into the country and its cultural nuances.
- Bumbling Dad: Mr. Heron. He doesn't even know what being grounded exactly means.
- Good Parents: Cady's parents are loving towards her, and always support her.
- Parents as People: They are good parents and likely academics but they homeschooled a daughter who hasn't been exposed to the nuances of U.S. culture long enough to know what she is getting into when they enroll her into a public high school in the suburbs and are shocked when she ends up being corrupted by the shallow, materialistic influences around her and breaks rules.
- You Are Grounded: Subverted as they do not know what being grounded means, but they said this for word when they find out about her failing math.
June George (Amy Poehler)
- Mrs. George: What kind of mother do you think I am? Why, do you want a little bit? Because if you're going to drink I'd rather you do it in the house.
- Buxom Is Better: She felt this enough to get breast implants and she shows off her new cleavage every chance she gets.
- Dumb Blonde: She's a good-natured but very ditzy blonde woman who gets taken advantage of by her daughter.
- Extreme Doormat: Somehow she and her husband caved to Regina's demands to get their Master bedroom with the balcony and restroom.
- Hidden Depths: In the musical, at least, she's shown to miss the times when Regina looked up to her as a role-model as a child, and is visibly worried for Regina when she looses her social standing after being publically humiliated
- Mum Looks Like a Sister: She looks more like the mother of her grade schooler daughter rather than both that and the teenage Regina.
- Parents as People: Wants to be seen as cool and fun to her daughter and her friends but this led to having an angry daughter who has no productive outlet for her energy and uses it to mistreat people.
- Pink Is Feminine: She is first introduced in a soft pink tracksuit.