!Main Characters

!!William "Will" [=McKenzie=]

-->Played by: Simon Bird

* {{Adorkable}}: When he's not being pompous, he has his moments.
* AmbiguouslyBrown: Comes up exactly once, when [[FrenchJerk Patrice]] mistakes him for an Arab.
* BerserkButton: Repeatedly being denied alcohol when everyone else is underage, too.
* BlindWithoutEm
* BringMyBrownPants: As a result of nerves and too many energy drinks, he shits himself during an exam.
* ButtMonkey
* CoolLoser: Zigzagged. When he actually picks up (or at least is close at picking up) girls, it's usually because they fall for his peculiar humor or pertinent sarcasm. But most of the time, these traits just make people consider him to be a pompous/awkward freak.
* CunningLinguist: Is the only member of the group that has any knowledge of any language other than English (as shown by his conversation in French with Patrice). Downplayed, though, as he doesn't find himself in any other situations where other languages are needed (if he knows any) and justified in that he's probably studying French for his A levels.
* DeadpanSnarker: Particularly in the narrations. In fact, it's what women find most attractive in him.
* DiggingYourselfDeeper: Has a tendency to keep going off on tirades long after he should have stopped, most notably in his rebuffing of Kerri.
* DoggedNiceGuy: He gets very annoyed when OneshotCharacter Lauren prefers Simon over him.
* EmbarrassingNickname: "Briefcase" (or some variation thereof) until the time he [[BringMyBrownPants shits himself]].
* TheHero
* HeterosexualLifePartners: Due to being the most reasonable members of the group, Will and Simon bond relatively quickly
* KavorkaMan
* LargeHam: At times.
* LikeFatherLikeSon: TheMovie reveals that hot women are attracted to Will's dad as well.
* LoonyFriendsImproveYourPersonality
* TheNarrator
* NeatFreak: Problematic, since his other three friends are GuysAreSlobs.
* {{Nerd}}
* NerdsAreVirgins
* NeverLiveItDown: In universe, [[BringMyBrownPants shitting himself in an exam.]]
* NotSoAboveItAll: While he generally attempts to behave more grounded and rationally minded than most of his friends and is clearly more responsible in the majority of situations, there are several incidents that prove he is effectively capable of the same level of thoughtlessness and ineptitude. Most evident when he's left home alone, he eventually joins in with the lads in destroying daffodils after a few cans.
* ObsessedAreTheListmakers: He makes a study plan that takes several days to make.
* OfCourseImNotAVirgin
* OnlySaneMan
* ParentalAbandonment: His Dad.
* TheSmartGuy: Somewhat subverted in that he's while he's academically bright and smarter than the other three, he often reveals his limited amount of social skills and general impulsiveness in particular situations.
* SociallyAwkwardHero: He could be interpreted as this as he has undertaken some misguided deeds that express his ultimate lack of understanding certain societal norms. Such as:
** Vocally complaining when a group of people were seated at the front of a ride he and his friends had specifically queued for, only to find out said people were obliged to take this space in the ride as they were disabled.
*** Somewhat justified, in that he had no knowledge of their disability, having never previously seen these people, and he also showed extreme remorse for these actions.
** Impulsively placing a wig within his underwear during a date with an older woman, after a prank lead to his own pubic hair being removed, causing further embarrassment for him.
** Attempting to amiably break off an effectively one-sided relationship with a girl he was never attracted to, only to create a scene during his friend's birthday party.
*** This was partly the girl's fault; she had manipulatively claimed that Will attempted to have sex with her, prior to breaking off the "relationship".
** Becoming the subject of abuse after making several pretentious, patronising but ultimately not malicious claims towards a group of garage workers he would be employed by during his work experience.
** Claiming to have engaged in several sexual encounters in order to secure his relationship with a slightly older, promiscuous girl, only to face more severe humiliation when his lack of sexual experience is evidenced.
** Making wild claims of said girl's opinion of him and an extreme exaggeration of their "relationship" to avoid being further abused by the afore mentioned group of mechanics.
* SophisticatedAsHell: He has a more advanced vocabulary than pretty much anyone else in the show, but he's not about a ClusterFBomb when he gets angry.
* SurroundedByIdiots: He is academically more knowledgeable than his three friends and usually more grounded uptight and sensible than them (other than possibly Simon, as the voice of relative sanity alternates between the two characters depending on the situation)while he has his own moments of tactlessness, he is generally among the most rationally minded and logical of characters in the series.

!!Simon Cooper

-->Played by Joe Thomas

* {{Adorkable}}: Sometimes.
* AnguishedDeclarationOfLove: He ''tries'' to give one to Carli, but something always goes wrong.
* BerserkButton: Much as he complains about it, he goes mental when Jay and Neil accidentally let his car crash into the river.
* [[BrattyTeenageDaughter Bratty Teenage Son]]: Probably the biggest offender of the four, and his little brother is a BrattyHalfPint. Granted, he also has AmazinglyEmbarrassingParents, but still.
* ButtMonkey
* CannotSpitItOut: Most notably at the prom, when he has everything set up for a romantic declaration of love to Carli and he chokes. Fortunately, Neil [[HotForTeacher manages to take]] [[RagingStiffie the heat away from him]].
* DeadpanSnarker: Not to the same degree as Will, but his OnlySaneMan status makes him have his moments. Like Will, he especially loves saying "brilliant".
* DoggedNiceGuy: To ridiculous levels with Carli.
* TheDriver: For the first two seasons is the only one with a car, so drives the rest of the lads everywhere. [[TheAllegedCar Granted, it's not a good car, but still.]]
* EmbarrassingNickname: [[RagingStiffie "Boner"]] for the entire first series.
* HopelessSuitor: To ridiculous levels with Carli. He's pined for her since he was eight years old and doesn't get anywhere with her until the end of series 2, and even then, she doesn't really care about him.
* ItsAllAboutMe: When his father tells him that the family will need to move to Swansea so he can keep his job, Simon goes mad, claiming that his life is ruined as a result.
* TheLancer
* LoveMakesYouDumb
* NakedPeopleAreFunny: While all the lads fall victim to this at some point, it's a recurring theme with Simon. He ends up naked at least OnceASeason PlayedForLaughs.
* OnlySaneMan
* RagingStiffie: Gets one in the very first episode when Carli leans into him.
* TheReasonYouSuckSpeech: Gives Will, Neil and Jay one in the final episode after they let his car crash into the river.

!!Jay Cartwright

-->Played by James Buckley

* AbusiveParents: His Dad belittles him in almost every conversation he has in the series and his mother just sits there and lets him.
* AttentionWhore
* AllMenArePerverts
* BerserkButton: "FOOTBALL FRIEND! FUCKING FOOTBALL FRIEND!"
* BlatantLies: Just about everything he says.
* BigBrotherInstinct: He gets unusually annoyed when Will makes a joke about his sister and demands Will takes it back. Will does, then switches to a YourMom joke. Jay ignores it.
* CasanovaWannabe
* ChivalrousPervert: Surprisingly, but when he actually does get a girlfriend in-series, he's actually quite respectful towards her. He also becomes this in the movie with [[BigBeautifulWoman Jane]].
* TheDanza: Sort of.
* DirtyCoward: Often; He immediately tells [[CrazyJealousGuy Donovan]] that Will is upstairs with Charlotte, mocks Simon after some guys threaten to beat him up over something ''Jay'' did, ditches his friends when some chav pre-teen girls get their brother to chase them with a baseball bat...
* DrivesLikeCrazy: In contrast to Simon, who drives like an old woman, Jay is extremely reckless behind the wheel of his mother's car.
* FreudianExcuse: The way his Dad treats him explains a lot of Jay's behaviour.
* HaveIMentionedIAmSexuallyActiveToday
* HiddenDepths: When he actually does have a girlfriend, he's a pretty attentive and caring boyfriend. He's also a pretty good DJ and is NotSoDifferent from Big John.
* JerkAss
** JerkAssFacade: In the series 1 finale, he lets slip to Big John that he only acts the way he does to get attention.
** JerkWithAHeartOfGold: Especially in the movie. In the series, while he ''is'' shown to have some (rather well-hidden) redeeming traits, he is more often portrayed as a JerkWithAHeartOfJerk. But that may be due to the cynical nature of the series, while the movie, comparatively, has more heart-warming and ThrowTheDogABone moments.
* KnowNothingKnowItAll
* LargeHam: Can slip into this at times.
* LovableSexManiac: He wishes.
* MenDontCry: Averted- Jay ends up crying after his first serious girlfriend dumps him. [[JerkassWoobie It actually makes you feel sorry for him.]]
* MyGodWhatHaveIDone: This happens to Jay when his lie ends up getting his dog put down.
* TheNicknamer: Almost never calls Will by name in the first two series, but instead some variation of "briefcase". In the third series, when Will becomes more known for shitting himself at an exam than carrying around a briefcase, Jay starts calling him by name, though still lets slip a briefcase insult/joke once in a while.
* TheObiWannabe: When it comes to love advice.
* SirSwearsALot: Probably has the filthiest mouth out of the lads, although they have their moments too.
* TokenEvilTeammate: Evil is a strong word, but most of the time, Jay isn't actually nicer than school bully Donovan - the main difference simply is that Jay is too big of a coward to use violence. His jerkassery is [[PlayedForLaughs played more for laughs]] than Donovan's, though, but except for his very few PetTheDog moments, he only seems to be part of the group by virtue of having known Simon since early childhood and being admired by Neil who is stupid enough to believe in his lies.
** There's also the fact the lads are clearly aware of Jay's FreudianExcuse- Simon even accuses Jay of be being scared of his Dad in the movie. Donovan on the other hand mostly seems to act like a dick ForTheLulz.
* UnsympatheticComedyProtagonist
* WhatYouAreInTheDark: When he talks alone with Big John in the sixth episode, he shows a surprisingly nice side of himself and even seems to find John sympathetic. However, when others are around, he doesn't miss one chance to gravely insult John, especially about his weight - because the general consensus is that John is a loser.
* WellDoneSonGuy: A lot of his lies are to impress his Dad, but his Dad is GenreSavvy enough that he doesn't fall for it. Unfortunately, he then tends to respond to Jay's attention seeking by belittling him.

!!Neil Sutherland

-->Played by Blake Harrison

* AnythingThatMoves: He's not fussy about who he winds up with, which is probably why he's the first of the lads to lose his virginity.
* TheBigGuy
* CloudCuckooLander: Particularly when he goes on about how many things are drugs, starting with relatively sane things such as cigarettes and alcohol and moving on to stuff like trainers and clingfilm.
* CompletelyMissingThePoint: All the time.
* DancingWithMyself: Does this at a Caravan Club party. Will admits that he's actually quite good.
* TheDitz: Bordering on TooDumbToLive
* EmbarrassingMiddleName: [[GenderBlenderName Lyndsey]].
* FoolishSiblingResponsibleSibling: Foolish to Katie's Responsible. Not that being more responsible than [[TheDitz Neil]] is hard.
* {{Gasshole}}
* GoingCommando: Under his monkey costume at Thorpe Park, much to the disgust of the others. Neil counters that the monkey isn't naked- "he has a vest on!"
* HotForTeacher: Has a crush on Miss Timms and makes a move on her at the end of the first series.
* KavorkaMan
* LikesOlderWomen: Not only Miss Timms but also the older women around Malia in TheMovie.
* NiceGuy: Neil can be annoying due to his stupidity, but he has almost no actual {{Jerkass}} moments compared to the other lads. He is also generally polite and is quick to comfort his friends in the "arm around the shoulder and kind words" way that the others would probably deem as too "bent" or girly.
* StupidGood

!Recurring Characters

!!Mr Gilbert

-->Played by Greg Davies

* ActorAllusion: Greg Davies really was a teacher before taking up acting.
* ChildHater: He really seems like one at times.
* CoolOldGuy: On holidays at least.
* DeadpanSnarker: Probably the biggest in the show.
* DeanBitterman
* [[DoNotCallMePaul Do Not Call Me Phil]]
* {{Jerkass}}
** JerkWithAHeartOfJerk: Will thinks he's a good enough guy to help Neil out once (he thinks) he got a girl pregnant. He's wrong.
*** He does at least stop Mr. Kennedy from trying to molest Neil several times, so at least there's that.
* NotSoDifferent: Despite hating Will with passion most of the time, he genuinely agrees with him when Will argues that a fashion show is a stupid, unethical way to collect money for charity since only good-looking people are able to take part. However, he is still enough of an asshole to force Will to take care of the charity money anyways.
* PetTheDog: Neil mentions Gilbert takes him making a move on Ms. Timms after one too many beers quite well.
* SadistTeacher / ApatheticTeacher: The former against students who have managed to personally annoy or insult him, especially Will. The latter against students in general.

!!Carli D'Amato

-->Played by Emily Head

* AlphaBitch
* BitchInSheepsClothing
* GirlNextDoor
* LoveInterest: For Simon. It's pretty much one sided though.
* SatelliteCharacter: Most of her characterisation revolves around Simon pining over her.
* TheTease: When Simon stops paying attention to her and starts getting interested in Lauren, all Carli has to do is compliment him and he instantly forgets all about Lauren.

!!Charlotte Hinchcliffe

-->Played by Emily Atack

* AllGirlsWantBadBoys: Was in a relationship with Donovan, and it's implied she's not totally over him.
* BuxomIsBetter
* DefrostingIceQueen
* EveryoneLovesBlondes
* MemeticSexGod: In universe, according to Jay.
* MsFanservice: Will notes he would do anything Charlotte asked him to- including participating in the Fashion Show after deriding it repeatedly as shallow and ridiculous.
* ReallyGetsAround

!!Mark Donovan

-->Played by Henry Lloyd-Hughes

* AxeCrazy: Will refers to him as "the school psycho." Hash seems to make him "spread butter like a maniac."
* TheBully
* TheCharmer: Gets away with his bullying because he's very polite and pleasant towards adults. (And girls.)
* CrazyJealousGuy: He's threatened Will for being with Charlotte and is implied to have beaten Patrice to a pulp for sleeping with her.
* {{Jerkass}}
** JerkWithAHeartOfGold: Though if you tell anyone that, he will kill you.
* KarmaHoudini: None of the protagonists are physically inclined, so Donovan can pretty much get away with screwing with them without retaliation.
* KickTheSonOfABitch: Beats up [[FrenchJerk Patrice]] for sleeping with Charlotte.
* MrFanservice

!!Big John

-->Played by John Seaward

* ButtMonkey
* TheDanza
* FatIdiot
* KavorkaMan: Is seen at a house party with his hand on a girl's breast.
* ThePigPen
* StrawLoser: He often appears when the four main characters seem to be complete losers to point out that they are actually not at the bottom of the hierarchy (there ''is'' a reason they're called "inbetweeners" - they're not really losers, at least not if they pull themselves together, but they are surely not popular either), because guys like John are much worse off.
** However, it's inverted in the episode "Will's Birthday" where the fact that even ''John'' is invited to a party shows how uncool the four main characters are.
*** Although, when confronted, the girl in question says the only reason she didn't invite the lads simply because she didn't know them that well.

!!Polly [=McKenzie=]

--> Played by Belinda Stewart-Wilson

* AmazinglyEmbarrassingParents
* BuxomIsBetter
* DeadpanSnarker: Has her moments.
* GenreSavvy: Knows perfectly well the text she got from Will's phone sent by Neil wasn't written by Will, so she simply tells him she's happy he got there safely.
* RunningGag: Whenever Will goes anywhere with his mates, she goes off to get him a jumper.
* StacysMom: Everybody, from the school psycho to the head of sixth form, has a thing for her. The lads always make comments about her, much to Will's chagrin.
* ThatCameOutWrong: Her attempts to comfort Will usually have her accidentally insulting him, but she does try.

!!Kevin Sutherland

-->Played by Alex [=McQueen=]

* AmbiguouslyGay: Though he strenuously denies it.
* FanDisservice: Those shorts!
* HaveIMentionedIAmHeterosexualToday

!!Alan Cooper

-->Played by Martin Trenaman

* AmazinglyEmbarrassingParents: Will not shut up about his sex life.
* TheComicallySerious: Or [[CringeComedy The Cringe Comically Serious]] if you want. Whenever he goes into unnecessary details about his sex life, he often has a completely deadpan face as if he thinks mentioning his sex life is just like discussing politics. This tends to embarrass Simon even more.
* ReasonableAuthorityFigure: He waits to hear Simon's side of the story when Simon accidentally climbs into Carli's little brother's room and professes love to him.

!!Terry Cartwright

-->Played by David Schaal

* AmazinglyEmbarrassingParents: Berates Jay constantly
* FatBastard
* {{Gasshole}}
* {{Jerkass}}

!!John "Paedo" Kennedy

-->Played by Waen Shepherd

* BunnyEarsLawyer
* CreepyMonotone
* MemeticMolester: In universe. Hence the nickname.
* NamesTheSame: [[CaptainObvious Well, duh.]]
* UltimateJobSecurity: Lampshaded