The youngest and cutest of the girls, with a high-pitched voice that makes ears bleed. A ten-year-old child prodigy who transfers to Yukari's class and always seems to get the highest scores and is the go-to person for questions but is (almost) bottom in sports. She comes from a rich family, with a large house in town and a summer house by the beach, but her (human) parents are never seen. Rather than being spoiled, some characters think she turned out to be the perfect child (from a parent's perspective) as she is extremely intelligent and responsible, making her own breakfast and lunch, waking up her parents, taking care of her dog, etc.
Innocent Prodigy: She has the best test scores in the school, but most teenage issues go way over her head.
Just a Kid: Chiyo hates the fact that no one takes her seriously, wishing she was older and more intimidating like Sakaki. Which in it self is hilarious considering the fact that Sakaki wants to be just like her.
Oh Crap: Examples include that time Yukari said the class trip was cancelled, and when Chiyo found out Iriomote cats can eat animals as large as her dog.
The quiet, tall girl who sits in the back of the class. At first, people think she's mean because of her looks, but nothing could be further from the truth. Has extreme Cuteness Proximity bordering on Osaka-level daydreaming, especially with animals (and especiallykittens) and Chiyo. Too bad her mother is allergic to cats. Exceptionally athletic (all the sports clubs want her to join), she wins her sports festival events by talent and determination rather than training. Also gets good grades. These last two seem unfair to Kagura.
Animals Hate Her: At one point, she looks at her scarred hand and comments that she "might not get off so lightly" if she encounters a wild cat, instead of the domestic variety.
Buxom Is Better: A subversion, as Sakaki dislikes the large amount of attention her bigger size draws. Life's tough when your less endowed friends talk about them all the time.
Character Development: She appears to open up more and more to her friends as the series progresses, mostly to Chiyo and Kagura.
Cloudcuckoolander: Not on an Osaka level, but between her shyness and her strange daydreams, when Sakaki does say things they can be rather...odd. Chiyo-Dad, below? She's the one who sees him most often, and she seems to be thoroughly convinced that he really is Chiyo's father.
Sakaki's intimidating appearance is clearer in the manga, where in her first scene with Chiyo she's drawn with a hostile-looking expression, making it clear why Chiyo would be quite afraid of her. She's drawn with a softer expression in the anime. This may prompt anime viewers to wonder what Chiyo is so afraid of. However, both the anime and manga mention Sakaki's bandages from Kamineko's bite being mistaken for an injury from a fight, so you can see where the other students get their impression of the character.
Hot Chick in a Badass Suit: Her gakuran costume during the third athletics festival is enough to reduce Kaorin to yelling "HOORAY!" over and over again.
Let's Get Dangerous: In a way. Everyone knows she's good at sports. Old news. Tease Chiyo because she can't run? She takes that personally and will proceed to demolish the competition in response. Also acts as an awesome bodyguard for Chiyo during the snowball fight.
Luminescent Blush: Ouite often, mostly in response to seeing kitty cats!
The extremely-energetic member of Yukari's class who likes to make everything into a competition. Failing that, her default behavior is to annoy others or cause a commotion, though not out of malice (well, not more than any other teenager). Is best friends with Yomi, though it's unclear how the two of them manage to stand each other.
A-Cup Angst: She's nowhere near the flattest character on the show, but Yomi's always mocking her breast size anyway. She does start quite a number of perverted jokes though (more in the manga). A few of them are about Sakaki's, Kagura's, and Yomi's breasts. Maybe she's envious? She jokes that she'd do better in sports like the aforementioned if she had Kagura's figure.
Tomo's definitely jealous, particularly of Sakaki's size, as she laments being in the same "group" as Osaka, and is ecstatic whenever her own size increases. She's also obsessed with Kagura's large bust.
In the dream episode, you can quite clearly see that in her dreams, she's a lot bustier than normal.
Baka: Is at times the recipient of this insult, except, in one amusing case, where she is the one screaming it with glee in response to one of Yomi's annoyed remarks.
Berserker Tears: When Yomi manages to eat curry noodles without splattering it all over herself, Tomo is pushed over the top and goes on a rampage in the lunchroom with tears in her eyes until she accidentally hits Yukari. Yukari's subsequent reaction must be seen to be believed.
Big Bra to Fill: Discussed in regards to her desire to be like Fujiko Mine. Tomo believes the only thing lacking is her chest size...
Brilliant, but Lazy: Normally low-scoring and rarely saying anything intelligent, when she applies herself she can pass exams — and even maxed out her mark in a health exam when she specifically studied for it. She seems to pick and choose what she studies for. Tomo also seems to act bone-headed as much as actually being stupid.
Cosplay: As a giraffe, much to the annoyance of Yomi and Minamo.
Image Song: Sora wa Tobikiri Paradaisu and Poi Poi Peace. Also shares one with Yomi, and another with Kagura and Osaka.
Important Haircut: They mean nothing, and Yomi cracks up at the prospect, since the most common reason for this in Real Life Japan is getting a new boyfriend.
It Amused Me: This seems to be the motivation for her behavior, given that she decided to study hard for a test with no other reason than to spite Yomi.
Another noteworthy moment was when her teasing actually managed to get under Kagura's skin and hurt her feelings, and Tomo's reaction makes it clear that it was unintentional. Tomo being Tomo, she decides to cheer Kagura up by annyoing her so much that she quickly forgets to be upset by a little teasing.
The Rival: She tries to antagonize and compete with everyone, just for the hell of it — especially Chiyo and Sakaki. She was also Osaka's Unknown Rival on Osaka's first day.
Too Dumb to Fool: Of all people, Osaka finds this out in her one attempt to prevent the "Osaka" nickname from spreading. She points out how little time she's lived in Osaka as a reason to not call her that. A smart person would note that all of the locales listed are just suburbs of Osaka. Tomo just gets too confused by all the places and sticks with the one she can remember.
The most normal member of Yukari's class, and also the most focused. Best friends with Tomo, and has a surprisingly-high tolerance level for her shenanigans. Often plays the Straight Man and becomes stern or angry when others cross the line. Enjoys food and, as a result, always seems to be on a diet.
Image Song: Sorezore no Oneway and Oishii Kimi-Tachi.
Irony as She Is Cast: Yomi can't sing, despite Rie Tanaka having a great singing voice. It's even more ironic when Yomi's image songs are sung beautifully.
Jack-of-All-Stats: Not quite as fast as Sakaki, Not quite as strong as Kagura and not quite as smart as Chiyo. Heck, it's even reflected in her bust size: Big, but not the biggest. Tomo mocks her for her JOAS status in the Tsukurimashou image song.
Shoryuken: Delivers a few to Tomo when she gets sick of her antics. They knock Tomo out cold.
Sick Episode: She misses out on the girls' trip to Magical Land because of a fever. She gets another one after playing in the snow by the end of the episode. Poor Yomi...
As her (forced) nickname suggests, Ayumu Kasuga is a transfer student from Osaka. It's not actually her real name and she lived there for only one year, but she was no match for Tomo's enthusiasm and thick-headedness. Sometimes lapses into non-sequiturs when speaking, and often gets lost daydreaming. Isn't the sharpest crayon in the box and is even beaten by Chiyo at sports, but has a knack for puns and riddles and pun-based riddles. Without question, one of the most popular characters in the show.
A-Cup Angst: Could you imagine that she felt like Chiyo betrayed her when Yomi pointed out that Chiyo was only flat because of her age, and that she might become as well-endowed as Sakaki when she get older?
Bird Run: Subverted; Osaka tries this during a relay race, but it only slows her down. Then again, Osaka isn't a very good runner to start with; she even loses to Chiyo.
Everyone Calls Her Osaka: Her name is Ayumu Kasuga, but everyone starts calling her "Osaka" by the start of Second Year. In the anime, she's Osaka within moments of her first appearance once Tomo decides to nickname her. It's bad enough that the school (or at least Yukari) can't remember her real name, either.
One hilarious moment from the manga shows her looking at the class lists one year, she was looking for "Ayumu Kasuga", but wasn't there, leading her to believe she wasn't in a class with any of her friends. Turns out she got listed as "Osaka".
Only Known By Her Nickname: Starting in Second Year, even the official school roster calls her "Osaka". In the anime, she's known as Osaka from her first day.
Petite Pride: Weakly claimed that "being Japanese is fine." Ten seconds later, she's yelling at Chiyo, because she might actually get boobs.
A tanned girl who joins the core class in Second Year (because Yukari wanted to win the Sports Fest). Like Sakaki, she's very athletically inclined. She is the only main character not in the Go Home Club, spending a lot of time training for the swim team (which makes Kurosawa her coach). She becomes very good friends with Sakaki. Sideburns never looked so cute.
The girls' homeroom teacher throughout all three years of their high school career and also teaches English. She tries to act as a teacher and "best friend" to them. Not the most responsible of teachers, she is often late because she wanted to buy a video game or wanted to sleep in, and has been known to cancel class to do P.E. instead. Is fiercely competitive with phys-ed teacher and long-time friend Minamo Kurosawa. She is an absolute terror behind the wheel, and has traumatized more than one student with her crazy driving (Tomo is th eonly one, whoe approves of her style of driving... Due to her being three fries short of a happy meal, too).
Blah Blah Blah: Yukari tries speaking to a foreigner in English, which the viewer isn't supposed to understand anyway. In the English dub, this turns into French.
Conspicuous Consumption: To the point where she'll aggressively attack anyone fortunate enough to have experienced them before her.
Drives Like Crazy: The "Yukarimobile" is a force to be reckoned with, and far more beat up than any less-than-seven-years-old car has the right to be. Her still being the Trope picture, even after it's been changed, should say something.
Image Song: Otona wo Yasunde Dekakeyou and Tenshoku Equal Kaikan no Housoku, both of which are shared with Nyamo, with the latter also featuring Kimura.
Keep It Foreign: In the English dub, Yukari changes from being an English teacher to a foreign language and grammar teacher. It's similar for the first issue of the translated manga; the second issue got a new localization team and switched to her being an English teacher, though some other English-language gags are inexplicably changed to French and German.
Red Eyes, Take Warning: Tomo tries to smack Yomi in the face with a dinner tray, complete with a slow-motion jumping attack, but misses, and whacks Yukari in the face. Cue scary music and a slow-motion reveal of Yukari's glowing red eyes, then cutting to her whapping the living hell out of Tomo with two trays.
The school's phys-ed teacher and swim team coach. A very diligent and caring teacher (especially in contrast to Yukari), and many students look up to her. She's been friends with Yukari since at least college (high school in the manga). Given Yukari's personality, one wonders how they stayed friends so long.
Berserk Button: Don't mock her being single and unmarried.
Book Dumb: Though not quite as bad as Tomo, Osaka or Kagura, it's still implied (see Corner of Woe below).
Corner of Woe: During the third beach episode, she is unable to help the students with studying and is even shown up by Yukari.
Heroic BSOD: Nyamo has a massive one the morning after she got totally drunk and gave some extracurricular education to the girls, and again when Yukari one-ups her with her mad Gratuitous English skills.
Image Song: Otona wo Yasunde Dekakeyou and Tenshoku Equal Kaikan no Housoku, both of which are shared with Yukari, with the latter also featuring Kimura.
In Vino Veritas: During the second beach episode, she drinks all the alcohol to avoid the disaster if Yukari gets drunk instead. She winds up giving the girls The Talk and then some.
The only male teacher on the campus who appears most of the time. Wears short-rimmed glasses and almost always has an open-mouthed stare. Has a thing for HIGH SCHOOL GIRLS! (Especially Kaorin.) Has a beautiful, loving waifu, a cute daughter, gives to charity, picks up garbage, and loves peeping.
Cloudcuckoolander: Is shown to occasionally have moments that call his clarity into question.
Dirty Old Man: And we repeat, he became a teacher CUZ HE LIKES HIGH SCHOOL GIRLS AND STUFF.
Ephebophile: Not lolicon...most of the time. See below.
Evil Laugh: If he's not evil, then he sounds freaking maniacal.
Jerk With A Heart Of Jerk: One of his lines can be paraphrased as "Well, now that I donated $100 to the orphanage, let's go for some peeping!".
Lolicon: "High school is high school." In other words, Kimura's joshikosei garb fetish ignores any and all age restrictions. In the manga, there's a point where the teachers wear high school uniforms for a costume race and Kimura hands Yukari a love letter ("Senpai, read this.").
Nice Guy: If you can look past his crazy love of high school girls, you'll see he is a kind man.
No Accounting for Taste: His wife loves him unconditionally and finds him quite handsome. No, really. To be fair, as noted above Kimura really is a nice guy for all his perversion. He apparently donates to charity frequently, and is shown using his New Year's wish on world peace (with a 10,000-Yen note).
The One Guy: Technically, there are two or three other recurring guys. However, they don't have names. He's also the only male character who appears in the opening, besides Chiyo's dad.
A giant floating orange-yellow cat...thing that sometimes pops up in Osaka's and Sakaki's dreams. Believed to be Chiyo's father, but it's hard to understand why he's never at the house.
Berserk Button: "Are you suggesting that I am not a real cat?!"
Osaka: You look like Mori, the previous Prime Minister!
(cue Chiyo-chichi shaking with rage)
Don't show anything red around him. Don't tell him you have a "Cat's Tongue" either, or he'll rip it out.
Mind Screw: We really have no idea who or what Chiyo-chichi is supposed to be, but Sakaki and Osaka have seen him independent of each other's description. Furthermore, plush toys exist of him in-universe (much to Sakaki's surprise the first time it's brought out), and Sakaki's smaller one proceeded to glow when she stopped paying attention to it...
One-Scene Wonder: Shows up in maybe five skits total. Everyone that knows this show will remember him without fail.
Slasher Smile: The smile(?) on his face never changes, even when he's angry.
Kamineko
A grey cat that Sakaki often tries to pet, only for him to run away or, more often, end with her hand clenched in his bear trap teeth. Eventually, he goes out of his way to make Sakaki's life a living hell.
Achilles Heel: Mayaa is the one other cat that manages to scare him off. He was even about to bite Tomo's hand, but she had just been scratched by Mayaa, he smells it, and runs off.
Cowardly Lion: He works entirely on intimidation. If you manage to scare him like Mayaa, or even just hit him on the head like Kagura, he'll run off.
Fragile Speedster: He shows how fast he is when Sakaki just tries to take a photo of him. He literally bounces off of the walls in an ally in order to ruin her photography attempts. He can't take a hit to the head before being scared off, though. Played straight in the fan-made fighting game.
Gang Up on the Human: Kamineko's biggest jerkass moment is when he assembles a gang of all the other neighborhood cats to attack Sakaki, and possibly Chiyo by association. Luckily, Mayaa was able to put a stop to it.
Jerkass: Probably the biggest in the show. Not that it stops Sakaki.
During the last episode, Sakaki walks up and apologizes to him for trying to pet him when he didn't want her to. She walks off and he follows her. She notices him following her, and it looks like he'll finally let her pet him. CHOMP!
Short for "That One Dude". You know, that onemale student that shows up, sometimes in the background? He's fixed Yukari's bike and is seemingly thrown into the series whenever they need a male student? Don't blink, or you might miss him!
Demoted to Extra: In the version of the bike-stealing scene that appears in the manga released to commemorate the 10-year anniversary of the original release, Tod is replaced with a random female student.
The youngest and cutest of the girls, with a high-pitched voice that makes ears bleed. A ten-year-old child prodigy who transfers to Yukari's class and always seems to get the highest scores and is the go-to person for questions but is (almost) bottom in sports. She comes from a rich family, with a large house in town and a summer house by the beach, but her (human) parents are never seen. Rather than being spoiled, some characters think she turned out to be the perfect child (from a parent's perspective) as she is extremely intelligent and responsible, making her own breakfast and lunch, waking up her parents, taking care of her dog, etc.
The extremely-energetic member of Yukari's class who likes to make everything into a competition. Failing that, her default behavior is to annoy others or cause a commotion, though not out of malice (well, not more than any other teenager). Is best friends with Yomi, though it's unclear how the two of them manage to stand each other.
As her (forced) nickname suggests, Ayumu Kasuga is a transfer student from Osaka. It's not actually her real name and she lived there for only one year, but she was no match for Tomo's enthusiasm and thick-headedness. Sometimes lapses into non-sequiturs when speaking, and often gets lost daydreaming. Isn't the sharpest crayon in the box and is even beaten by Chiyo at sports, but has a knack for puns and riddles and pun-based riddles. Without question, one of the most popular characters in the show.
The girls' homeroom teacher throughout all three years of their high school career and also teaches English. She tries to act as a teacher and "best friend" to them. Not the most responsible of teachers, she is often late because she wanted to buy a video game or wanted to sleep in, and has been known to cancel class to do P.E. instead. Is fiercely competitive with phys-ed teacher and long-time friend Minamo Kurosawa. She is an absolute terror behind the wheel, and has traumatized more than one student with her crazy driving (Tomo is th eonly one, whoe approves of her style of driving... Due to her being three fries short of a happy meal, too).
The only male teacher on the campus who appears most of the time. Wears short-rimmed glasses and almost always has an open-mouthed stare. Has a thing for HIGH SCHOOL GIRLS! (Especially Kaorin.) Has a beautiful, loving waifu, a cute daughter, gives to charity, picks up garbage, and loves peeping.
Another girl who sits in the background most of the time. Kaorin's closest friend, and is embarrassed about having to get homework help from Chiyo.
Short for "That One Dude". You know, that one male student that shows up, sometimes in the background? He's fixed Yukari's bike and is seemingly thrown into the series whenever they need a male student? Don't blink, or you might miss him!
