All-Loving Hero: Even though he has his jerk moments, Ned Bigby does not hate anybody, and plus he always gives advice to those in trouble, whether he or she is a student or a teacher. He hates letting people down so much that his bad habit in Guide to: Bad Habits was saying yes to everyone. This trope is Averted at times like when he was the Revenger in one episode, but at end of that same episode, he realizes that revenge is wrong.
Attention Deficit... Ooh, Shiny!: Has trouble concentrating, which does get him in trouble sometimes (okay, a lot!) This is also why he had trouble focusing on his project in Guide to: Procrastination until three days before it was due.
Borrowed Catchphrase: In "Guide to: Elections", Ned says "D'oh!" after Suzie Crabgrass offers him a free candy bar which says "Ned is a TOTAL LOSER / VOTE SUZIE!" (on the wrapper) and he gullibly accepts.note (The "/" indicates the first line being on top of the second.)
The Everyman: He's a fairly average middle school student. He's not exceptional at anything (unlike Cookie, who excels at academics, and Moze, who excels at everything), and gets average to low grades.
The Big Girl: Moze is easily the strongest of the trio and, before Cookie hit his growth spurt, was the tallest as well. She's beaten Ned and Cookie up many times, shoved Ned against a locker during her "anger" phase of the Five Stages of Grief when she lost her backpack, beat Loomer up after he gave Ned a huge wedgie in the third grade and, more recently, flipped him in Guide to: Gym, was able to send Loomer and his posse running just by threatening to beat them up, and was able to beat all the boys on Polk's wrestling team in wrestling practice without breaking a sweat.
Brainy Brunette: She has the most common sense of the group, and her grades are definitely not shabby, what with her being a straight A student.
Height Angst: She has a whole subplot dedicated to her being much taller than the other girls at school. This becomes meaningless later on in the series when the other characters get older.
Heroic BSOD: Happens when she thought she hurt Coconut Head during a game of dodge ball. She didn't
Huge Schoolgirl: Lampshaded in Guide to: Your Body, which dealt with her self-consciousness about her height. According to Lindsey Shaw's IMDb page in December 2007 she was 5'7" (170cm), two years after the episode was made.
Jerk with a Heart of Gold: Moze is short-tempered, aggressive, and sarcastic, and she frequently insults Ned and Cookie, but she does care about them and is usually willing to help in whatever way she can.
One of the Boys: Her best friend is Ned, she hangs out mostly with Ned and Cookie, she doesn't have any actual female friends, hates skirts (and had to be dared to wear a flowery dress), likes sports, couldn't care less about many girly things, such as boy bands and gossip, trash-talks during volleyball games (according to Coach Dirga, Moze gives some of the best (and worst) trash-talks she's ever heard), can and does beat people up, and is aggressively athletic and very competitive.
One Steve Limit: In-Universe. Ned gave her the nickname of Moze in Kindergarten because there were three Jennifers in the class.
Only Known by Their Nickname: Subverted. While fans of the show always refer to her as Moze, all the characters in-universe, except Ned, Cookie and Gordy, usually call her Jennifer.
Tomboy with a Girly Streak: She may be tough-as-nails, aggressive, and One of the Boys, but she still has some girly interests, such as shopping and going to the spa. But in one episode where she is dared to wear a dress for the whole day, she calls it "pure torture."
Beware the Nice Ones: When he lost his temper in Guide to: Dodgeball after Loomer's dodgeball damaged his videocamera helmet, he threw the dodgeball so hard it knocked Crony out. This, unfortunately, also allows Loomer to be able to turn him to the "dark side."
Cookie: I'm sorry! I guess I just...lost my temper.
In Touch with His Feminine Side: He likes braiding hair, desperately wants to be a cheerleader, loves girly books, likes getting his nails done, got so attached to the baby doll he and Ned had to take care of in life science class that he took it home for the holidays so that it wouldn't feel lonely, and has worn skirts more often than Moze (though this is in part because Moze hates skirts).
Large Ham: At times, but it is a kid's show and he is only marginally worse than the others.
Nerd Glasses: Though he doesn't seem to need them to see, since he's been able to spend large parts of certain episodes without them with no adverse effects. He has them because they have an operating system inside, so he can use them as a computer.
The Nicknamer: For one episode, "Guide to: Nicknames." He creates a nicknaming program that creates nicknames based on characteristics entered into it. Unfortunately, the nicknames the program creates are pretty hurtful...
The Smart Guy: Though lacking in the common sense department, he is definitely very intelligent, having the highest grades in school and inventing many interesting gadgets. In terms of book-smarts, he is the smartest of the trio.
A nerdy girl with a crush on Cookie that he generally ignored for seasons 1 and 2. Eventually had her braces removed and got contacts, getting the attention of a considerable amount of boys, including Cookie.
Sickly Neurotic Geek: She started off with braces, Nerd Glasses, and a perpetually stuffy nose. Subverted, however, because a season or two later she comes back looking less nerdy and on a new allergy medication. One episode has her temporarily revert to this, as she had allergies again and had to wear hypoallergenic clothing and glasses. This time without the curly hair and braces, though.
Clingy Jealous Girl: To an extreme degree. In addition to giving us the page quote, she scares off any female except Moze who get's remotely close to Ned until he fakes dating Moze just to drive her off.
Ned: Missy, I've found someone else.
Missy: You're so cute when you say things that will get you and whoever you're talking about severely injured.
Bunny-Ears Lawyer: Subverted/inverted in "The New Kid," where another janitor competes for Gordy's position. Gordy keeps the job... not because of his competence (the other janitor was in fact a lot better), but because he was shown to care more about the students than his competition did.
Jerkass/Jerk with a Heart of Gold: He's often boorish and rude, sometimes unreasonably so, but at the end of the day he does genuinely care about the students and sometimes even gives good advice to them.
A teacher who uses a computer to teach math from home.
Noodle Incident: She is terrified of people and no one knows why. She does imply that part of her isolation was a result of overloading her schedule and losing herself to stress. Whatever happened to her was so traumatic that she no longer leaves home. The most she does is communicate with people through a webcam.
Sadist Teacher: At first, but it turns out it was a sort of Jerkass Fašade so she wouldn't be scared of her students from that year on. Ironically, it had the opposite effect until she loosened up.
Jim J. Bullock
The flamboyant Life Science and Health teacher, as well as editor of the school newspaper.
Alpha Bitch: Admits that he used to be a male version in his younger years in "Guide to: Bullies". As you can see, it didn't stick.
Mr. Monroe: I ruled the hallways with my biting wit and vicious sarcasm!