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Class 1-C
Rebecca "Becky" Miyamoto
Voiced by: Chiwa Saitō (JP) and Hilary Haag (EN)
The eleven-year-old advisor of Class 1-C and the school's mathematics teacher.
- Adorably Precocious Child: Becky is the adorable homeroom teacher of Class 1-C, who somehow graduated from the Massachusetts Institute of Technology at the age of 10 and somehow received a job at Japanese high school soon after.
- Beautiful Tears: Whenever Becky gets scared or upset, she turns into a chibi character and hides behind a curtain as she sobs. The others often note how adorable it is and Himeko even calls this "the Hau-Hau".
- But Not Too Foreign: Becky was born to an American father and a Japanese mother.
- Butt-Monkey: Her class sure love making fun of her.
- Cosplay Otaku Girl: Besides her labcoat over blousers and skirts attire, she is also seen in other attires, such as an Elegant Gothic Lolita or on nekomimi-themed pajamas.
- Grade Skipper: Extra exaggerated with Becky already being a MIT graduate and a teacher at age eleven.
- Idiot Hair: In Episode 3, Becky briefly gets one, and she gets so frustrated with hers that she rips Himeko's right out of her head.
- In-Series Nickname: She's nicknamed "Becky".
- Improbable Age: She's a MIT graduate and mathematics teacher at age eleven.
- Innocent Blue Eyes: She has big, blue eyes to emphasize her young age and childishness despite her being a genius.
- Innocent Prodigy: She's a genius who became a teacher at eleven years old, but she's still a kid and acts her age for the most part.
- Labcoat of Science and Medicine: She often teaches her students in a lab coat that goes all the way to her ankles.
- Little Miss Snarker: She's eleven and likes to snark at the antics of her students.
- Master of Disguise: She once managed to flawlessly impersonate Mesousa, a Giant Salamander and Sayaka for a whole episode.
- Not So Stoic: She's often cool and collected, but in scary or uncomfortable situations, she acts like a kid her age — immature, spoiled, and quick to hide behind a curtain and cry like the little kid she is at the first sign of trouble.
- Only Sane Woman: She's often the levelheaded teacher in a class full of quirky students.
- Sensei-chan: Exaggerated, since she tends to act childish because she's actually younger than her students, being only eleven years old.
- Super-Deformed: Sometimes, usually whenever she cries.
- Token Mini-Moe: She's the only child in a cast full of teenage girls.
- Unlimited Wardrobe: She wears a notable variety of costumes throughout the anime.
Himeko Katagiri
Voiced by: Fumiko Orikasa (JP) and Brittney Karbowski (EN)
An incredibly energetic girl with an Idiot Hair and a taste for crabs. Her antics often annoy her classmates.
- Butt-Monkey: She's a frequent victim of slapstick.
- Cloudcuckoolander: She frequently annoys her classmates with her antics and her inability to carry a straight train of thought.
- The Ditz: She's the dumbest girl in the class.
- Genki Girl: She almost never stays still for more than one second.
- Idiot Hair: Hers even moves around of its own accord and apparently is the source of her hyperactiveness (when Becky took it from her, she lost all her drive and much of her strength. She use two chopsticks stuck into her hair as a replacement, before she got it back).
- Large Ham: She just loves being loud and hammy. The English dub even pushes it further.
- Motor Mouth: She has a tendency to talk a lot and fast, which is more pronounced in the English dub.
- Trademark Favorite Food: Anything that tastes like crab. Although she has only eaten imitation crab.
- Verbal Tic: She says "Maho" a lot. She also often attaches "Omega" to the beginning of things.
- Wingding Eyes: She gets a perpetual case of starburst-eyes when she's possessed by the mushroom alien.
Rei Tachibana
Voiced by: Satsuki Yukino (JP) and Carlee Gabrisch (EN)
The cool-headed, calculating think-tank of Class 1-C.
- Anime Chinese Girl: Although she isn't actually Chinese, Rei does work at a Chinese restaurant and is seen wearing a qipao on occasion. She also wears her hair in odango buns sometimes.
- Book Smart: Rei has the second highest GPA in the entire school.
- The Glasses Gotta Go: While she already looks attractive with her glasses, her beauty is even more pronounced when she takes them off and puts on a qipao.
- Jerk with a Heart of Gold: She frequently threatens bodily harm to anyone in order to enforce order. She's often the first to try to put Becky in her place should she go too far, but is also the first to try to lure her out should she end up crying.
- Paper-Thin Disguise: When working, all Rei does is putting on a qipao and taking off her glasses, but her own friends and acquaintances can't even recognize her.
- Sexy Slit Dress: When working at a Chinese restaurant, she wears a qipao with slits to show off one of her legs.
- Stoic Spectacles: Her glasses emphasize her mature and coolheaded character.
Miyako Uehara
Voiced by: Yui Horie (JP) and Natalie Nassar (EN)
A student in Becky's class obsessed with studying. The most down to earth of 1-C, and often blames the other characters for her failure to study.
- Berserk Button: She gets annoyed when others call her a "bookworm".
- Curtains Match the Window: Her hair and eyes are both orange.
- Fiery Redhead: She has orange hair and will often get mad if she is unable to study due to her classmates' crazy antics.
- Forehead of Doom: Miyako's noticeable, shiny forehead has shown to do the following over the course of the series:
- Reflect the sunlight and focus it into beams of energy that set things on fire like a Kill Sat.
- Give instant suntans.
- May require sunglasses to view directly.
- Can act as a police spotlight when chasing after a criminal at night.
- Can easily get wedged and stuck in tight spaces.
- Himeko thinks that it's able to use the shine to kill germs, although it actually didn't work.
- It gets used as a grooming mirror by Himeko. That's just the tip of the iceberg too.
- Hard Work Hardly Works: For all her efforts, Miyako still ends up over average. She's often quick to blame her classmates for her subpar performance.
- Informed Ability: According to her Boss Subtitles she has them, one of which was launching beams from her forehead.
- Not So Above It All: She tries to be the normal and no-nonsense girl in the class, with less than optimal results since her short temper and Forehead of Doom often make her join he weirdness anyway.
- Smart People Wear Glasses: Subverted. She wears glasses and is often seen studying, but she isn't a particularly good student and her grades are mediocre.
Sayaka Suzuki/"No. 6"
Voiced by: Kayo Sakata (JP) and Monica Rial (EN)
A kind-hearted (to the point of naivete) girl in Becky's class.
- Catchphrase: In the anime, she has a catchphrase where she calls someone or something "the ~~ of the year", for example, "Miss Miyamoto, you're the teacher of the year", or "Miss Miyamoto, you're the walking encyclopedia of the year".
- Curtains Match the Window: She has blue hair and eyes.
- Extreme Doormat: Her classmates often send her on errands and menial tasks because she's such a good girl that she does not mind others taking advantage of her kindness.
- In-Series Nickname: Sometimes Becky refers to Sayaka as "ribbon-head" due to her hair ribbons.
- Mistaken for Gay: She likes Igarashi-sensei, and the girls of Class 1-C initially assumed she was in love. Turns out her feelings were more about admiration. Then Episode 15 shows a brief moment with Himeko, and Episode 17 shows her handcuffing Miyako so they won't get separated, although some of her classmates suspect something else.
- Nice Girl: She's by far the most polite and pleasant of Becky's students.
- Not So Above It All: On occasion she can join the gang's antics, and is also shown to snark once in a while.
- Verbal Tic: Sayaka's gimmick in the anime is saying that something is "the ~~ of the year".
- You Are Number 6: Igarashi explains that Sayaka is the sixth girl with the surname "Suzuki" to attend the school, hence she's nicknamed "No. 6".
Kurumi Momose
Voiced by: Kana Ueda (JP) and Melissa Davis (EN)
An average-looking girl who doesn't like being called "ordinary."
- Butt-Monkey: Her Running Gag is getting depressed when people call her out on being The Generic Girl. She can even fade almost completely out of existence altogether when she gets called plain/boring or ignored too much.
- Curtains Match the Window: She has light brown hair and eyes.
- Expository Hair Change: In the second half of the show Kurumi's hair is noticeably longer
- The Generic Girl: Her only outstanding trait is looking generic and boring. Rebecca even calls her "boring girl" when she can't remember her name.
- Genki Girl: Definately has signs of this, as she's seen only trailing Himeko in being quite happy.
- Meido: She works at a Maid Cafe... whose sales aren't doing well because of presence fails to attract customers.
- Misery Trigger: Call her "plain" and she'll crawl into the corner of the rabbit hutch gloomily singing "ra-ra-ru..." She's also known to turn invisible whenever a rabbit hutch isn't readily available.
- Only Sane Woman: Similar to Miyako and Becky, she also takes the Sanity Ball.
Ichijou
Voiced by: Ai Nonaka (JP) and Maggie Flecknoe (EN)
The Class Representative of Class 1-C.
- Ambiguously Evil: She has a body count for starters.
- Character Catchphrase: "My name is Ichijou, the Class Representative."
- Chaotic Stupid: What she does may seem evil, or less often good, but often determining what drives her is impossible, especially when some of her actions obviously do not benefit her.
- Class Representative: She's the representative of the main cast's class.
- Cloudcuckoolander: She's prone to erratic, weird behavior.
- Curtains Match the Window: Her hair and eyes are brown.
- Hammerspace: She sometimes pulls her little sister out of her shirt.
- Interspecies Romance: With the Alien Captain.
- Murder Is the Best Solution: In the first and second episode, she repeatedly tries to poison Becky, insisting that this will solve everything. Rei, being Rei, picks up on this immediately and decides to have Ichijou taken out of the episode. She ends up killing Mesousa at the end of the first episode instead. In another episode, it's also implied that she killed Hibiki when the latter was spying on Becky.
- No Full Name Given: We never learn her first name; the other characters only call her "Ichijou" out of respect for her position as Class Representative. It's hinted at one point that her given name might be "Honey", though.
- Reflectionless Useless Eyes: It's as if her flat brown eyes let nothing in or out; she is always calm about everything happening around her, and we don't get to see what's happening inside her mind.
- The Stoic: She's calm in every situation.
- Weirdness Coupon: Most of her bizarre behavior is dismissed as "It's just Ichijou."
Mesousa
Voiced by: Vanilla Yamazaki (JP) and Christine Auten (EN)
Becky's pet rabbit.
- The Chew Toy: Mesousa serves as the slapstick of the series, being blown up in one episode and having his legs broken in another, all without complaint.
- The Eeyore: He always looks gloomy and depressed.
- Series Mascot: Mesousa is often featured in anime promotional art as a near equivalent to the title.
Class 1-A
Miyuki Igarashi
Voiced by: Sayaka Ohara (JP) and Shelley Calene-Black (EN)
Homeroom teacher of Class 1-A.
- The Alcoholic: She is a heavy drinker who often comes hung over to class.
- Apathetic Teacher: When not suffering from a hangover mid-class, she's often staring through the windows.
- Hard-Drinking Party Girl: She even appears drunken in the middle of her class.
- Hot Teacher: Even if she rarely tidies herself up, she still looks nice when teaching class.
- Unkempt Beauty: She's notorious among her students for never wearing make-up nor never dressing properly, but she still manages to look kinda cute.
Yuma and Yuna Kashiwagi
Voiced by: Sawa Ishige (JP) and Serena Varghese (EN)
A pair of identical twins from Class 1-A. Yuma is the elder and Yuna is the younger.
- Berserk Button: They both get annoyed when their teacher Igarashi calls on either of them as "Kashiwagi twins" as if they are one person, though it's Yuma who voices their dismay.
- Curtains Match the Window: Their hair and eyes are light purple.
- Energetic and Soft-Spoken Duo: Yuma is energetic in sharp contrast to her soft-spoken twin sister Yuna.
- The Fashionista: They're interested in fashion and dressing up.
- Identical Twin ID Tag: Because they're identical twins, they're only distinguishable from each other by their side ponytails as well as the colors of their hair ribbons and socks. Yuma ties her hair on the left side of her head with a blue ribbon and wears knee socks of the same color, while Yuna ties her hair on the right side of her head with a red ribbon and wears stockings of the same color.
- Polar Opposite Twins: Yuma is energetic and outgoing, in contrast to the introverted and reserved Yuna.
- Theme Twin Naming: The twins' names, Yuma and Yuna, are almost the same except for one letter.
Shu Momose
Voiced by: Takahiro Sakurai (JP) and Brandon Hearnsberger (EN)
Kurumi's older twin brother. A laid-back character and a skilled chef.
- Butt-Monkey: Not as severe as his younger sister, but on occasion he still gets treated like a servant.
- Supreme Chef: He's a good cook.
- Team Dad: In the event Igarashi-sensei is too drunken to handle the class.
Yuzuko Kurusu
Voiced by: Asuka Nakase (JP) and Kim-Ly Nguyen (EN)
A bumbling girl and member of the Intelligence Department and the Film club.
- Enemy Mine: A friend of Akane. She doesn't know that she's in the drama club, who are the Film club's mortal enemies.
Class 1-B
Saotome
Voiced by: Eiji Hanawa (JP) and John Gremillion (EN)
The advisor for Class 1-B and PE Teacher.
- Covert Pervert: Becky once claimed he only became PE teacher to bask at the sight of girls in bloomers.
- Hot-Blooded: He's highly energetic and enthusiastic.
- Large Ham: He often makes a scene in front of his students.
- Limited Wardrobe: He's rarely (if ever) seen without his trademark tracksuit.
- No Full Name Given: His given name is unknown.
Suzune Shiratori
Voiced by: Ryō Hirohashi (JP) and Kira Vincent-Davis (EN)
A tall, athletic girl from Class 1-B.
- Huge Schoolgirl: She never misses a chance to use this tauntingly against her friend Otome.
Otome Akiyama
Voiced by: Tsugumi Higasayama (JP) and Cynthia Martinez (EN)
A stature-challenged girl who often hangs out with the tall Suzune.
- Butt-Monkey: Frequent prank of height jokes from Suzune, who even holds her and presses a Pressure Point on her head in order for her to stop growing. But Suzune always touches the one that induces diarrhea instead.
Hibiki Watanuki
Voiced by: Chieko Higuchi (JP) and Lesley Tesh (EN)
Leader of the Intelligence Club.
- Intrepid Reporter: Especially tries to cover "scoops" regarding Becky and her own class.
- The Rival: Considers Rei to be her rival.
- They Killed Kenny Again: Sometimes her reports end with her "death", only to come back alive and well each time.
Yankee
Voiced by: Eiji Hanawa (JP) and Andrew Love (EN)
The only known male in Class 1-B.
- Gonk: He's cartoonishly ugly, being fat and having swollen lips.
- Verbal Tic: Ends his sentences with "dot-com".
Zula
Voiced by: Mugihito (JP) and Eve Jones (EN)
A masculine-looking female.
- Brawn Hilda: She's a woman who looks like a muscular dark-skinned man.
Class 1-D
Old Geezer
Voiced by: Hiroshi Otake (JP) and Andy McAvin (EN)
The elderly advisor of Class 1-D and literature teacher.
- Big Ol' Eyebrows: His eyebrows are so thick and hairy that they completely conceal his eyes.
- Couch Gag: The armband on his left arm shows a different text in every episode.
- Cut His Heart Out with a Spoon: In episode 1 he threatens his own class with haunting them should they leave class to see Becky, who has just arrived at that time.
- Drives Like Crazy: In Episode 11, he gets his first chance in 40 years to drive when he borrows Igarashi's convertible, dressing like a fighter pilot for the occasion. Becky is his passenger; the drive literally scares her stiff.
- No Name Given: He's the only teacher whose name isn't mentioned.
- Only Sane ManOld Geezer: "Aren't there any sane person in this class?"Tsurugi: "Look who's talking."
Akane Serizawa
Voiced by: Miyuki Sawashiro (JP) and Luci Christian (EN)
A cosplay-obsessed girl and a member of the Drama club.
- Anime Hair: She's got two parts of hair that stick up like cat ears.
- Enemy Mine: Best friends with Kurusu, unaware that she's a member of the Film club, the Drama club's mortal enemy.
- Master of Disguise: At one point, she even posed as Becky herself.
Behoimi
Voiced by: Mai Kadowaki (JP) and Rozie Curtis (EN)
A "magical girl" from Class 1-D.
- Chronic Hero Syndrome: Becky even asks her to ask herself if she really believes herself to be a Magical Girl or just wants to help others.
- Chuunibyou: Behoimi describes herself as a healing or soothing-type Magical Girl, and wears an eye-grabbing pink cosplay to prove it. She eventually grows out of it.
- Girlish Pigtails: She changes her hairstyle to low pigtails after she stops cosplaying. Ironically, she was much more jovial and girlish before changing to this hairstyle.
- Opaque Nerd Glasses: After dropping her Magical Girl act, she wears large glasses with opaque lenses that hide her eyes.
- Rose-Haired Sweetie: She has dark pink hair, is cheerful and wishes to help others. After she drops her Magical Girl act, her hair changes to black and she loses her cheerfulness too.
- Shout-Out: Her name is the same as the healing spell from the Dragon Quest series.
- Significant Wardrobe Shift: After coming to terms that she cannot continue with her Magical Girl persona, she completely changes her appearance by donning glasses, dying her hair black, tying it in pigtails, and dressing normally. Also, her personality becomes much more reserved and serious.
Media
Voiced by: Miyu Matsuki (JP) and Kara Greenberg (EN)
A mysterious girl sent to Momotsuki High to keep an eye on Becky.
- Eyes Always Shut: She keeps her eyes closed constantly.
- Meido: She dresses in a maid outfit.
- Mysterious Past: She and Behoimi have a past together that they vaguely allude to but never explain fully.
- Shout-Out: Her name is the same as the healing spell from the Shin Megami Tensei series.
Misao Nanjo
Voiced by: Hitomi Nabatame (JP) and Sasha Paysinger (EN)
An animal-loving blonde student.
- Animal Lover: She loves animals and regularly brings them to school.
- Giver of Lame Names: Her idiosyncrasy is giving her pets bland names, frequently simple wordplays on the pet's natural name.
- Tsundere: She usually doesn't get along with Tsurugi and can't understand his cavalier behavior towards her menagerie of pets, but always asks for his help in finding any lost pet.
Tsurugi Inugami
Voiced by: Hiroshi Kamiya (JP) and Chris Patton (EN)
A white-haired, serious student.
- But Not Too Foreign: Has a German grandfather.
- Friend to All Children: Lampshaded in his introduction. Highlighted when he helped Nozomi find Ichijou.
- Jerk with a Heart of Gold: He frequently criticizes Misao's strange menagerie of pets, but is nevertheless willing to help her find lost pets.
- Stoic Spectacles: He's a cool and collected guy with glasses.
- Sugar-and-Ice Personality: Despite his cool exterior, he's a calm, gentle boy who loves little children.
Akira Miyata
Voiced by: Ryōko Shintani (JP) and Jessica Boone (EN)
A clumsy student of Class 1-D and member of the Intelligence Club.
- Cute Clumsy Girl: Akira has a reputation for being clumsy because she frequently trips and falls.
- In-Series Nickname: Due to her clumsiness, Inugami calls her "dojikko".
Supporting Characters
Lord Cat
Voiced by: Hiroshi Kamiya (JP) and Tommy Drake (EN)
A mysterious feline entity whose residence is the school's vending machines. No relation to the Internet Reviewer of the same name.
- Cloudcuckoolander: Besides thinking he's God, he hides in vending machines to warm sodas with his body heat.
- Verbal Tic: In the Japanese version, he often says "desu nya" at the ends of sentences. "Nya" is Japanese onomatopoeia for the sound cats make; accordingly, in the English dub he says "Meow" instead.
Ichijou's Younger Sister
Voiced by: Ai Nonaka (JP) and Kira Vincent-Davis (EN)
Ichijou's infant younger sister.
- Black Bead Eyes: Her eyes are drawn as white dots surrounded by a black circle.
- No Full Name Given: Like her older sister, her given name is never mentioned in neither the anime and manga.
- Pint-Sized Kid: She's drawn in Super-Deformed style and looks diminutive next to the teenage characters.
Nozomi Ichijou
The middle sibling out of the Ichijou family who is around the same age as Becky. She is only seen in the manga.
Alien Captain
Voiced by: Mugihito (JP) and Mike MacRae (EN)
The leader of a group of aliens that observe Becky and the students of Momotsuki Academy.
- Actor Allusion: Appears as Captain Picard in the last couple of episodes. Mugihito voiced Picard in the Japanese dub of Star Trek: The Next Generation
- Aliens Speaking English: Speaks fluent Japanese despite being an alien.
- Everyone Calls Him "Barkeep": He is only known as "Captain".
- No Need for Names: Has absolutely no idea what his subordinate's names are.
Alien Subordinate
Voiced by: Tomokazu Sugita (JP) and Rob Mungle (EN)
A... subordinate of the Alien Captain who often snarks on their situation.
