The central protagonist and Straight Man to the constant shenanigans surrounding her, Carly is a relatively normal highschooler. At least, as normal as you can be when you're an Internet celebrity in a Dan Schneider TV series.
A-Cup Angst: Early on but she's gotten curvier every day
Butt Monkey: She gets this treatment from time to time, especially Spencer. In Carly's case, it's dealing with stuff such as trying to promote a crappy shoe line and suffering through a bitchy teacher taking her heartbreak-induced rage out on her students. It's enough to make Carly a woobie.
Claustrophobia: Her time in the space program has made her develop this. She literally starts freaking out when she realizes that she, Sam, and Sam's mother were in a small room.
Dude Magnet: It seems almost all the guys want Carly. Almost.
Establishing Character Moment: Taking the blame for Sam to keep her from being expelled, then showing that she is the only person who can control Sam.
Even the Girls Want Her: Missy, Sam and Shelby have all shown signs of being attracted to her in more than a "just friends" way
Flanderization: As of Season 5, she has started randomly insulting people, telling off Spencer and being mean spirited.
Also she has become dumber. While she was never Lisa Simpson, she was a good student at the very least, She complained about not getting a well-deserved A in a class. As well as being generally pretty smart, she also worked hard on her schooling to get her first ever straight a's. She was also much more book smart than Sam to the point where she was accepted into a private school that even Freddie wasn't. But now she seems but now she seems just barely smart enough to live. This didn't happen all at once, but gradually over time, coming to a head in season 5. Like in the space episode, she can't pronounce claustrophobic, even though she is claustrophobic. In iQ she has to fake/cheat being intelligent to try and impress a guy when the old Carly would've have been able to at least hold the conversation easily.
Good Is Not Dumb: In general, but averted in iStill Psycho where her acceptance to go back in the Dershlits' house made the gang their prisoners once more, and then again when she believed Mr. Dershlit was even sane enough to let them go.
The Kirk: The 'choose between the McCoy and Spock' aspect of this trope comes directly into play in iDate Sam & Freddie where Carly is constantly put in the middle of Sam and Freddie's fights, until it overwhelms her and she tells them they shouldn't be dating unless they can fix their problems themselves.
Ms. Fanservice: Her dancing dress in iDream of Dance, being clad a bikini in the skit of iHatch Chicks, being in a sports bra and boxing shorts in iFight Shelby Marx, being bound and gagged by Sam in iSpeed Date, wearing a sleeveless blouse and skimpy shorts in iBeat the Heat... Much moreso with how she dresses during her dates and being stranded in a bathtub for most of an episode.
What the Hell, Hero?: Carly does this to Sam in iKiss, when she explains to Sam how her exposing Freddie's secret has utterly ruined his reputation and made it impossible for him to leave his house without people making fun of him. Sam, at first, shrugs this off, until Carly makes her realize that she went too far, even for her.
Carly's best friend and petite blonde co-host of the iCarly webshow. In this Power Trio, Sam very definitely takes on the "Brawn" side: she's aggressive, violent and eats everything. She has a very tenuous relationship with her mom, who was S He Who Must Not Be Seen until finally introduced in Season 4, played by none other than Jane Lynch
Ambiguously Gay: Sam seems to enjoy being masculine a lot and the show has it's own Ho Yay page dominated by Sam/Carly subtext. Sam also appear to lose interest in boys quickly. One has to wonder if she's into boys at all.
Bully Hunter: If Carly is threatened she is willing to attack other bullies.
Character Development: The writers and Jennette Mc Curdy herself knew that if Sam was going to end up being the lead in the Sam & Cat spin-off that Sam's behaviour needed to be 'toned down' in the last season to make it believable.
Cross-Cast Role: As the "Cowboy with a Mustache" with a deep, gruff voice, fake mustache and complete western attire.
Cute Bruiser: She's widely acknowledged as the toughest kid in school, took down a bully twice her size and ripped the chain lock off the door when chasing Freddie in iKiss. She only failed to catch him because she was towing Gibby and didn't seem winded by it.
Disappeared Dad: iParty With Victorious finally tells us her dad walked out on her, Melanie, and her mom.
Disproportionate Retribution: In retaliation for Freddie handcuffing her to Gibby, which was in turn all for the endless abuse she had given him, Sam reveals Freddie's embarassing secret, that he's never kissed a girl, to the world on the webshow.
At some point offscreen, Sam asks Freddie what time it is and he didn't know. Sam's response? To take his NERD camp application and make it look like Freddie's a dirty whore, which gets him rejected. Plus, Carly begs him not to dump Sam over that because it was before they started dating.
Even Bullies Have Standards: She is shown to be hostile to other bullies and when a friend of hers hit a nerd, just for being a nerd, she calls her out saying she only attacks people who deserves it i.e. annoying people.
Evil Twin: Compared to her polite and mild mannered twin sister Melanie.
Femininity Failure: In iMake Sam Girlier she did this to get a guy's attention, with Carly giving her help to embrace her "inner daffodil". She ends up fighting with another girl by the end of the episode. As it turns out, the guy was impressed and said he didn't want to date "some daffodil."
Flanderization: Her tomboyish vibes from Season 1 evolved into various examples of extreme bullying, anti-social and sociopathic behaviour, like her running a child labour sweatshop in Season 4. After that season the writers knew they were going to have her continue in the Sam & CatSpin-Off, and attempted to de-flanderize her. YMMV on how much that worked, but they have definitely toned her down for the actual Sam & Cat show.
Her antagonism and fighting with Freddie was blown up in both iDate Sam & Freddie and iCan't Take It. While she has screwed with Freddie in the past, in iCan't Take It, she sabotages Freddie's science camp simply because he didn't know what time it was when she asked him.
Hypocrite: Openly reprimands Gibby for bringing a few fatcakes from Canada to U.S.A. (which is deemed illegal) wherein she has several belts hidden under her jacket strapped with several kilos of fatcakes.
Informed Ability: The tie-in blogs of other characters (usually Freddie) have Sam 'hack' them and make reference to Sam's ability with technology.
Irony: Her attempt to intentionally smuggle fatcakes from Canada caused her to hide in a mistaken trolley bag, unintentionally causing her to be smuggled into Asia instead.
Stun Guns: She uses a shock pen in "iStill Psycho".
Suppressed Mammaries: Started around Season 2. In Season 3 it was in full effect, with obvious strapping down and buried under multiple layers of Tomboyish clothes. In Season 4 they gave up and now Sam occasional wears clothes that show off her figure.
Third-Person Person: Sometimes refers to herself as "Mama", especially when she's feeling angry or competitive — more than usual.
The cameraman and general tech-support guy for iCarly, as well as Carly's other best friend. He is an all-around nice guy, along with growing up under the wing of his overbearing mother Marissa Benson.
Butt Monkey: He has a hopelessly unrequited crush on Carly, which she exploits for all it's worth in order to get him to do things he doesn't agree with. The first time he actually goes against what Carly wants (to do something he really likes), she insults him then tells his mother about it. The main source of his buttmonkeyness lies in Sam who endlessly insults, harasses, physically abuses him, humiliates him in front of other people at school and on the webcast, breaks his possessions and causes him constant problems. And then there's his monstrously overprotective mother.
Pilot episode: Freddie doesn't have a single appearance in the episode that doesn't involve Sam insulting him, Freddie being reminded that Carly doesn't love him back (by both girls, Sam does this especially harshly) and being physically abused by Sam for making a simple mistake. Carly convinces Freddie to keep helping the girls, not by getting Sam to stop insulting him, but by manipulating Freddie through his crush on her. It doesn't get better.
Chick Magnet: Girls have been hitting on him in various episodes. He's even the focus of a blooming best friend Love Triangle.
Childhood Friend Romance: Carly says in that episode that Freddie wanted Carly to be his girlfriend since the first time they met. That's probably anywhere near sixth grade (depending on when they first met). He was about 16 years old when he finally managed to get Carly, for a week before he Anchored Ship because he wasn't sure if it was real. She finally reciprocates in the final episode.
The Chew Toy: Seriously, the amount of shit everyone gives toward him is tremendous.
Ensemble Dark Horse: In-Universe, when the trio go to Webicon, he's clearly far more popular than either girl. He gets mobbed by fangirls. Carly and Sam don't get anywhere near that level of attention, and most of the fan questions revolve around which of them is or should be dating Freddie.
Oddly, when he's not the subject of shipping, everyone looks down on him.
Flanderization: As of Season 5, he has started dismissing Carly, ignoring her, blowing her off and generally treating her like shit.
Gratuitous Spanish: Starting from the second season, it gets to the point where it's annoying with the random phrases.
He Is All Grown Up: Remember when Nathan Kress was scrawny and had a high voice? Where it was completely acceptable to think that in iPilot Freddie was 2 or 3 years younger than Carly? Yeah, those days are incredibly over.
Hollywood Dateless: Averts both sides of the trope, by attracting regular girls on several occasions, but not being thought of by people (except Sam) as being completely inept. Valerie, Shannon, Rona, Leslie, Melanie, Carly, Magic Malika, Sabrina, the fangirls at Webicon, Patrice and Sam all show varying levels of interest in Freddie over the course of the series. He then dated Carly in iSaved Your Life and was in a temporary (four episode arc) relationship with Sam.
Even lampshaded in-universe when he parodied the angsty vampire FredwardCullen.
They're really kicking up the Mr. Fanservice vibe by constantly having him in the short sleeve shirts that would immediately mark him as a nerd - if it wasn't obvious that he's been spending some decent time on the free weights.
Will They or Won't They?: Has been a focus on the character, having dated both his female best friends throughout the show's run. Teased in the finale with Sam, but ultimately he ends up with his childhood crush Carly.
Carly's quirky older brother and legal guardian, as their parents are off doing Godknowswhat (Mr. Shay is explicitly in the armed forces, but that's all that's been said). He is a sculptor of some sort, but easily out-wacky-hijinxes the younger characters despite his more-advanced age.
Big Brother Instinct: Despite his rather aloof personality, he shows potential of being Carly's guardian, especially in "iWanna Stay With Spencer", when Carly and Spencer's grandfather claimed Spencer was an unfit guardian, and tries to take Carly. Upon leaving, Spencer stops them to give them Carly's inhaler, despite she's never had one in years, stating that asthma is tricky. This convinces their grandfather to let Carly stay with Spencer.
In "iLook-a-Like", Spencer is shown in a much more mature demeanor, actually saying no to Carly for once when she asked to do iCarly at an MMA fight. When Carly demanded when Spencer become 'uncool', Spencer coldly retaliated by calling her out on 'acting a baby whenever she doesn't get what she wants'. In fact, he became highly pissed off when he discovered she actually sneaked out to see the fight.
Bunny-Ears Lawyer: Despite all his weirdness, he was able to pick up enough during his three days at law school (and the book on law he kept) to help the gang out of any legal mishap they get themselves in very effectively. It was even given quite a Shout-Out in iPromote Techfoots when he acted as the gang's lawyer and wore a bizarre necktie.
Epic Fail: His Running Gag is that the mundane objects he fixes, sculpts, or (at the very least) touches become extremely prone to bursting into flames, bypassing any form of scientific logic. He even lampshades the more outlandish ones.
This trait of his was Deconstructed by being Played for Drama in iGot A Hot Room when a lamp that Spencer gives to Carly bursts into flames, destroying her room.
iChristmas did the same from, but from Carly's perspective.
Man Child: He is a sculptor for a living, often making whimsical and sometimes weird sculptures that usually end up catching on fire or exploding before being perfected. He loves light-up socks, has a pet goldfish (that he often forgets to feed, resulting in another pet goldfish), and once went to law school for three days.
He even poses as Pam Puckett in iLost My Mind to break Sam out of the mental hospital.
Orenthal Cornelius "Gibby" Gibson
Portrayed by: Noah Munck
Appearing as a minor character when the series began, Gibby is among the main trio's friend and schoolmate and a frequent Butt Monkey guest in the webshow. As the show progressed, he was slowly developed to be one of the gang's most loyal friends and a usual sidekick to Carly's eccentric big brother Spencer.
Let's Get Dangerous: When he confirms that Nora had captured his best friends, his action is to go from Cloudcuckoolander to busting down her locked door and engaging her in a brawl throughout her house.
Just when it looks like Nora's defeated Gibby, he takes off his shirt. Cue triumphant music.
Promoted Fanboy: Is a huge fan of the British boy band One Direction and got to sing with them as a ploy to get their lead singer to stop pretending to be sick so he could keep staying at Carly's and be nursed by her.
Running Gag: Alternates from being shirtless or slow-witted during the first few seasons. When he became a main character, his shirtless scenes are ditched in favor of being unable to decipher a joke or a pun (which he averts by solving the gang's coded message by himself in iPsycho).
Cut Lex Luthor a Check: Despite being very young, he's obviously a pretty good computer tech or hacker or designer and such, and could probably make more money making websites if he didn't bother trying to shut down iCarly.com with various wacky schemes.
Disproportionate Retribution: Carly refused to kiss him and stuck some food in his face. Therefore, he swore Carly would rue this day and he embarked on a campaign of revenge, which included fraud and cyberterrorism.
One episode showed a video of him picking up the last jar of a particular brand of pickle in a store. As he's about to put it in his car, a little girl accidentally runs into him with a cart, causing him to drop the jar, which falls on the floor and breaks. He flips, screaming at the little girl and taking a lollipop she had out of her cart, then throws it on the ground, taunting her and screaming at her more as she's crying. The little SOB calls her mother an idiot. The numerous hateful comments the video receives about Nevel are well-deserved.
Hacker Cave: As Carly and Sam put it, Nevel's 'Nerd Cave'.
Heel-Face Revolving Door: In iPity the Nevel he has a Heel Realization. Although he goes back to his old ways at the end of the episode, showing even if he tries to redeem himself, he is always going to be like this.
Sympathy for the Devil: After hitting rock bottom on a viral video that disgraced himself, the iCarly gang of all people is the one he approached to ask help in restoring his good name. It doesn't last long though.
What Could Have Been: If Spencer was born normal, he and Carly would be boyfriend and girlfriend, much to Carly's horror.
Stalker with a Crush: He was victim of one. He even had to jump off of a boat, swim ashore, and change his name just to get away from her. Needless to say, he was stressed out to the extreme when the iCarly trio invited her.
Portrayed by: Mary Ann Springer
Brother Chuck: Vanishes in season 3, after her appearance in iFight Shelby Marx, the last episode of Season 2.
Kick the Dog: He has a lot of them to count but torturing Gibby is by far the worst, despite Gibby knowing kickboxing.
Your Cheating Heart: In “iHave My Principal”, he mentions that he has a wife but in “iTwins” Sam explains he’s in a relationship with Ms. Briggs. Same also brought the fact his wife hates him in “iGot Detention”.
Big Brother Instinct: Inverted with his little brother Chip, who decides to take revenge on Spencer by screwing with him and screwing with Carly as a form of poetic justice: since Chuck messed with Spencer, as Chuck's younger sibling Chip will screw with Spencer's younger sibling Carly.
Devil in Plain Sight: Although when his father does realize he's acting like a sociopath he promptly grounds him for it.
Disproportionate Retribution: He was breaking a building rule by playing raquetball in the lobby, and Spencer couldn't get him to stop, so he told Chuck's dad, who grounded him for 2 days. Chuck got revenge... By keeping Spencer locked up in a storage cage in the basement (and squirting him with a "suspicious liquid"). And then he's perfectly willing to beat the crap out of Spencer. All for a 2-day grounding over something he wasn't supposed to be doing in the first place.
Ax-Crazy: Lampshaded in-universe. She is completely insane, and at one point is wielding an ax.
As shocking as it sounds, she's worse in iStill Psycho.
Batman Gambit: In iStill Psycho especially. Her plan depended on so many things- the iCarlys forgiving her and agreeing to go to her house, the judge paroling her, Spencer picking them up and needing to use the bathroom, etc.
Comically Missing the Point: She fails to realize any metaphor of insanity directed at her. But she's well aware of her insanity in iStill Psycho, she just doesn't care.
Dark Action Girl: While she's not all that attractive, she's no slouch when it comes to fighting and engages Gibby in a rather brutal fight and holds her own.
Freudian Excuse: She has no friends, her parents left her alone on her birthday (apparently something she's used to happening), and she's had a pretty horrible life. Though this isn't nearly enough to justify her actions in iStill Psycho and it turns out her family is just as psychotic as she is.
I Just Want to Have Friends: Is a lonely girl with only her chicken to talk to... so she decides to kidnap the iCarly crew under the delusion that they're her friends.
Insistent Terminology: Nora despises any other words to describe her insanity. She prefers being called a "disturbed, lonely sociopath".
I Will Punish Your Friend for Your Failure: Kidnaps Spenser and traps him in her basement on a giant wheel, spinning him if the iCarly gang does anything she doesn't agree with. She even threatens to kill him if they go too far.
Knight of Cerebus: Unlike most villains in the show, she's treated as a dangerous lunatic In-Universe and whenever she shows up, there's little doubt the iCarly gang are going to be in serious danger.
Loony Fan: Her obsession with iCarly makes Mandy look sane by compairson.
Manipulative Bitch: In both of her appearences, she plays up her Freudian Excuse to trick the iCarly gang to do as she wants them to, not revealing her true motivations until they're already in her trap.
Never My Fault: Blames the iCarly gang for "ruining" her birthday party, when it was her own fault for kidnapping them in the first place.
Too Dumb to Live: The woman drove her car after getting eyedrops that distorted her vision, causing her to crash through a wall. This action was a nod to Drake & Josh, where Josh's boss, Helen, does the same thing. Sam and Melanie were born on a bus because she took one while having labor pains instead of calling a cab.
The Unseen: Spent 3 and a bit seasons as one, before being revealed in the episode iSam's Mom.