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Yuuko "Yukko" Aioi
Voiced by: Mariko HondaOne of the five "main" characters of the series, "Yukko" is an ordinary student with a propensity for forgetting her homework. She is also locked in a perpetual "Boke and Tsukkomi" gag with Mai.
"I should be glad nothing perishable landed on me!"
- Berserk Button: She can only take being called stupid so much before she snaps.
- Book Dumb: Not as substantial as other cases, but she does have to borrow homework from Mio on a regular basis.
- Breath Weapon/Wave Motion Gun: When in enough pain, her screams let out these. One of them even pierced through all the planets of the solar system (And Pluto)!
- Butt Monkey: The entire universe is apparently out to get her.
- Cannot Tell a Joke: She's Giftedly Bad at it.
- Cool Big Sis: Earns this right with the Professor. The Professor adores her and, in a manga chapter, Yukko proves capable of resisting the Professor's tantrums, even if only by being more nonsensical. In a Time Skip chapter, an adolescent Professor becomes ecstatic upon hearing Yukko's coming back to Japan.
- Easily Impressed:
- She's dazzled out of her wits when she learns that Nano is actually a robot and becomes enraptured by everything Professor makes her do as if she were a little kid. Even the simple act of pouring a cup of tea out of Nano's removable wrist.
- In the manga, she's incredibly impressed when she learns Sakamoto can talk. Being Yuuko, she then decides that the best thing to do is to... ask him to shake her hand with his paw. Every time Sakamoto says something, Yuuko is incredibly impressed.
- Face Palm: One evening, as she just got better from a cold, she remembers that she has two exams the next day. She tries to focus on English, but gets lost in her thoughts and ends up writing a poem. She promptly face palms after she realizes it.
- Genki Girl: Although she is certainly genki, she also plays it up sometimes to hide embarrassment.
- Goal in Life: Has twice now been shown to have no decided goal yet.
- Global Ignorance: In a series of flashbacks in the manga detailing how Mai and Yukko first met, we find out that Mai actually moved to Japan a little over a year ago, and is actually from Alaska. Mai sits down next to Yukko, who asks Mai which part of Japan Alaska is in.
- Gratuitous English: A serial offender."SUPER-ULTRA-GREAT-DELICIOUS-WONDERFUL [adjective]!"
- Hidden Depths: She's a damn good poet. Mogami River...
- Imagine Spot: Frequently daydreams in class about far-fetched scenariosnote explaining how Mio got her hair-ties, her twin tails, and her very person.
- The Jinx: Inverted, if Episode 26 is any indication. She's apparently sort of a karma sink. She herself is jinxed, but spreads good fortune to everyone around her.
- Minor Injury Overreaction: See Breath Weapon above.
- Motif: Watermelons. Her favourite kind of soda is melon flavoured, she attempts to reinvent her image by wearing a pair of watermelon clip-ons in her hair, and one segment involved her eating melon bread, realising that she ate the expiration date, and then nervously chewing.
- Oh, Crap!: When she realises that she may have pissed off Mio.
- Pungeon Master: She tries, anyway.
- Standing in the Hall: Often
- Straight Man: Occasionally, if Mio is acting up or playing sports, or if Mai is in "Boke" mode.
- Terrible Artist: In contrast with Mio, much to the latter's dismay.
Voiced by: Mai AizawaAnother of the five "main" characters, Mio is the most normal of the cast, but that isn't saying much. She usually plays the straight man to Yukko's antics.
"If she sees that drawing, she'll never think of me the same way again!"
- Badass Adorable: This adorable, very nice young girl is more than capable of kicking your ass seven ways to Sunday if you accidentally piss her off too much. She even gets scouted as a boxer at one point.
- Berserk Button: She's normally very nice, but if you ever mess with her food, even by accident or if you expose her Yaoi drawings, get the fuck out of there and head for the hills!
- Beware the Nice Ones: See above.
- Breath Weapon: When in enough pain, her screams let out these.
- Covert Pervert: To the extent that she beat up Yukko, a police officer, an old man, and a goat all in the name of preventing people from finding out she draws Yaoi.
- Cute Bruiser: See Badass Adorable. She's cute as a button, but pretty damn strong.
- Everything Is Better With Spinning: Hit Yoshino with a corkscrew and attacked Yukko and Sasahara's goat with a Dragon Screw.
- Flash Step:
- Girlish Pigtails: Held together by wooden cubes which, according to Yukko's daydreams, are magical artefacts that fell on her head from a zeppelin.
- Gretzky Has the Ball: An in-universe example, she can't play sports to save her life. She used to practice Kendo and is quite adept in shadow-boxing and wrestling apparently, implying her problem is with non-combat sports.
- Hair Decorations: Wears two wooden cubes in her hair. And aside from being kind of an odd choice for hair decorations, they're completely ordinary. Or are they?
- Hair-Trigger Temper: Around Yukko and Yoshino (though granted, the former is a bit of an idiot, and the latter is The Gadfly).
- Imagine Spot: At one point created an entire romantic scenario between Nano & Sasahara when Yuuko convinced her they were a couple.
- Iwo Jima Pose: Making small talk with Sasahara is momentous enough to merit a pose of a whole bunch of Mios raising a Sasahara flag!
- Laughing Mad: When she, Yuuko and Mai are stuck in an elevator. After Mio says "Eggplant", she and Yuuko break down into mad laughter over this, the fact that they're not getting any help any time soon, and the fact that Mai appears to have died. Laughing mad indeed.
- Lost Food Grievance: Don't mess with her food or bad things will happen.
- Love Hurts: After seeing Misato "escorting" Sasahara, she goes into Heroic B.S.O.D..
- My Life Flashed Before My Eyes: When she tastes her sister's kusaya (salted, sun-dried mackerel) jam the second time.
- Power Palms: During her fight against the green mooks.
- Serious Business: Her food and her Yaoi.
- Straight Man: Most frequently of the cast.
- Wrestler in All of Us: Her preferred method of knocking out people is wrestling moves, like the Dragon Screw.
- Yaoi Fangirl: Has a not-so-secret hobby of drawing yaoi doujinshi. And for your own safety, YOU BETTER. NOT. FUCKING. READ. IT.
- You Gotta Have Blue Hair: And nobody seems to care for it.
Voiced by: Misuzu TogashiRounding off the Power Trio with Yukko and Mio is Mai, a quiet bespectacled girl with a fondness for screwing with people just to see how they'll respond. Makes up the "Boke" side of her relationship with Yukko. Also has a thing for whittled Buddha statues.
"I was joking."
- Adjusting Your Glasses: Variant 3: In Episode 10, while she's forcing her friends to stand still for an obnoxiously long time in a game of "Red Light Green Light".
- Alliterative Name: Mai Minakami.
- Coming-Out Story: Subverted. When she "comes out" to Yukko, it turns out that she was just messing her. As usual.
- Cute Bookworm: Whenever she isn't interacting with the other characters, she's usually reading something.
- Cuteness Proximity: To the Professor, in something of an Out-of-Character Moment.
- Emotionless Girl: Subverted. She appears emotionless, but is in fact quite a prankster.
- Everyone Has Standards: Mai won't (intentionally) troll the Professor.
- The Gadfly:
- Meganekko: Though her glasses double as Stoic Spectacles.
- Mind Screw: At one point she takes off her hair revealing it to be a wig. She later revealed her baldness to be a wig (a bald cap) as well.
- Of course, it may have just been Yukko's imagination.
- Pet the Dog:
- The Quiet One: Rarely speaks a word unless spoken to.
- Serial Escalation: Her pranks get progressively more ridiculous.
- Uncatty Resemblance: Her dogs are as bad as she is.
- When She Smiles: She's normally pretty cute already, but she's even cuter when she smiles, like when Mio and Yuuko made up after a heated argument.
Voiced by: Shizuka FuruyaA Ridiculously Human Robot who wishes she were a real girl more than anything, even if it means things like being able to get dental cavities. She struggles to keep the fact that she's a robot a secret. A struggle not at all helped by the obvious wind-up key in her back which her creator absolutely refuses to remove.
- Arm Cannon: Except it's equipped with tiny, harmless pellets instead of bullets.
- Berserk Button: Her many new inventions that the Professor secretly installs on her.
- Crash-Into Hello: Subverted. When she crashes into a boy from school, it results in an Earth-Shattering Kaboom instead, followed by both parties landing on separate rooftops
- Do-Anything Robot: Except she can't play music.
- Everybody Knew Already: She thinks she has convinced people that she isn't a robot. She hasn't.
- Face Fault: A built in feature, thanks to the Professor.
- Fear of Thunder: She's scared of lightning, which makes sense, considering she's a robot.
- I Just Want to Have Friends: Her main reason for wanting to be more human-like.
- Ms. Fanservice: Not much of it, but at least compared to the other characters. One segment telling you about the animation studio and musicians has her in a swimsuit, and she's the only character to have visible breasts.
- Nice Girl: Probably the nicest character in the show, alongside Sakurai-sensei.
- Parental Substitute: The Professor's parents are never seen or mentioned, and Nano basically acts as a parental figure to her own creator.
- Pinocchio Syndrome: She wants to look as normal as possible, because she fears what could happen if people found out she was a robot.
- Ridiculously Human Robot: Her screw is the only clue (or rather, dead giveaway) that she's a robot. Take it off, and nobody would guess. (Hell, even with it, Mio wasn't convinced Nano was a robot right away).
- Robot Girl: A robot with the appearance of a young girl.
- Rocket Punch: One of her functions. Unfortunately for her, it tends to fly off whenever it wants.
- Super-Powered Robot Meter Maids: In addition to her pellet guns, Chapter 178 reveals she also possesses Super Strength, Rocket Feet, Super Hearing and some kind of Energy Shield.
- Swiss Army Appendage: Both of her arms.
- Why Did It Have to Be Snakes?: She's afraid of cockroaches.
- Willfully Weak: Chooses to not utilize even her less extreme functions, like speed-reading, for the sake of seeming that much more normal.
- Wind-Up Key: Much to her dismay, as it's a dead giveaway to the fact that she's a robot. The fact that its only purpose is to launch her toe like a rocket doesn't help either (that and the Professor thinks it's cute). She eventually realizes that this key is part of makes her who she is, and decides to keep it.
- Wise Beyond Their Years: She's only one year old and has the body and mind of a teenage girl, but she's a lot wiser than her age would imply.
- Younger Than They Look: She's one year old at the start of the series.
Voiced by: Hiromi KonnoNano's eight-year-old creator. Aside from her ability to build incredibly advanced machines, she's a completely normal kid. Likes sharks.
- Attention Deficit... Ooh, Shiny!: Especially when Nano asks her about her gadgets, much to the robot girl's dismay.
- Beer Gasm: She does this with milk in the anime's first opening.
- Berserk Button: Do NOT insinuate that robots are not cute in her presence.
- Big Eater: Can eat a month's supply of snacks and still have room for strawberry juice.
- Bratty Half-Pint: She has her moments of being this, mainly by causing trouble for Nano in some way or making Sakamoto's life difficult.
- Cheerful Child: She's generally a pretty happy, upbeat kid.
- Does Not Like Shoes: Almost always shown barefoot. Justified in that she's almost always seen indoors, where she has no reason to wear shoes.
- Everyone Calls Him "Barkeep": She's always referred to as Professor. We at least know her family name, but her given name is never mentioned.
- Fear of Thunder: Not surprising at all, considering she's only eight.
- For the Funnyz: Much of her antics fall under this.
- Genius Sweet Tooth: Much like most other children, she loves sweets. Unlike other children, she's capable of creating robots so advanced that it counts more like creating life itself.
- Hoist By Her Own Petard: Is often a victim of Nano's bean cannon.
- Innocent Prodigy: A typical eight-year-old girl who just happens to be able to make a highly advanced artificial intelligence.
- Kid With The Remote Control: Parodied like anything.
- Never My Fault: Played for Laughs. She'll always blame Sakamoto for something that she screwed up.
- "Silly Me" Gesture: She'll often do this when questioned by Nano about the latest weird function Nano has been given.
- Smart People Build Robots: Nothing quite proves how smart you are than building a Ridiculously Human Robot.
- Third-Person Person: Justified because of her age, as speaking in the third person is considered child-like in Japanese.
- Trademark Favorite Food: She loves omelet rice and strawberry juice.
- Why Did It Have to Be Snakes?: She's terrified of dogs, especially Mai's two dogs.
Voiced by: Minoru ShiraishiA black cat living with Nano and the Professor. He is able to talk due to a scarf the Professor created. He was originally Nakamura-sensei's cat, named Taisho.
- Accessory-Wearing Cartoon Animal: His scarf. It was made by the professor to allow him to speak.
- Attention Deficit... Ooh, Shiny!: When his cat nature takes over.
- Berserk Button: Call him "Sakamoto" without the "-san" enough times—something that Professor and Nano seem to have great trouble understanding—and he'll flip his shit. Why the official dubs declined to translate the honorific is unknown.
- The Chew Toy:
- Formally Named Pet: With Nano, at Sakamoto's insistance; he would prefer that the Professor do this, too, but she refuses to listen.
- Head Pet: In the 2nd opening.
- Hey, You!: He always calls the Professor 'kid/brat' and Nano 'girl'.
- Line-of-Sight Name: It was written on the box he was found in. His real name is Taisho.
- No Good Deed Goes Unpunished: Once in a while he'll let himself fall for one of the Professor's pranks only for said prank to be more than he bargained for.
- Not So Above It All: He tries to avoid succumbing to feline Animal Stereotypes. Badly.
- Parental Substitute: Since he is technically older than both Nano and the Professor, he feels he needs to be this and be respected as such. It doesn't work to say the least.
- Talking Animal: His bandanna affords him speech.
- Why Did It Have to Be Snakes?: He's afraid of dogs. Well, he is a cat.
Voiced by: Yoshihisa KawaharaA spacy student who wears an ascot at all times and rides a goat to school. He puts on pretensions of being the eldest son of a wealthy family. However, it's quickly revealed he's the eldest son of a family of farmers (hence the goat). He tends to irritate his classmate Misato Tachibana with his oblivious nature, causing her to frequently shoot at him. Don't worry, he can take it.
- Berserk Button: Don't tell him he can't bring his goat to school.
- Catch Phrase: "Well said!"
- Classy Cravat: Which he only seems to wear to make himself look classy.
- Contemplate Our Navels: The inspiration for his poetry often comes from rather absurd non-sequiturs involving anything nearby that happens to be occurring at that moment.*Nano's disembodied hand rockets past.*
Oh! 'Perhaps it is my right hand, trailing clouds across the blue sky. Sasahara." Not bad!
- Extreme Omni Goat: His goat, Kojirou.
- Full-Name Basis: How he addresses Misato Tachibana.
- Hot-Blooded: During his introductory scene. His goat is really important to him.
- The Load: Seems to be this in his duties for the festival committee. Which is, naturally, a source of frustration for Misato.
- Made of Iron: Kojiro can take anything Misato throws at him, and not even flinch.
- Mock Millionaire: He's actually not that rich, he simply acts like it.
- Oblivious to Love: He doesn't ever seem to have a reaction to Misato's aggressive behavior other than polite thanks for when she does stuff for him.
- Purely Aesthetic Glasses: "Just for show" as he says.
- Shirtless Scene: Derisashu~. It happens during the Josei segment in which Mio believes Nano and Sasahara are dating.
- Upper-Class Twit: Subverted. He's actually from a family of farmers and only acts like he's upper class, though he's still very much a twit.
- We Named the Monkey "Jack": Named his goat after himself.
Voiced by: Chika HorikawaA high school girl who frequently finds herself angered by the oblivious carefree actions of Sasahara. She expresses her frustration by unleashing an escalating arsenal of weapons ranging from revolvers to missile launchers. There are subtle hints that these outbursts may be the result of feelings for Sasahara on Misato's part.
- Backpack Cannon: Uses one in episode 25.
- Badass Adorable: Not quite on Mio's level, but she still counts.
- Berserk Button: Mention her relationship with Kojiro, and you'll be lucky if she doesn't hit you. Say that she should admit her feelings to him, and not even blood relations will protect you from her bazooka. In fact, Kojiro's very existence is a HUGE one.
- Cry Cute: In one shot in Episode 25, you can see tears in the corners of her eyes.
- Family-Friendly Firearms: Double subverted. Her weapons do look realistic and are more than capable of damaging the scenery, but the characters she does shoot with them are so Made of Iron that they still come across as this.
- Fiery Redhead: Fire when ready.
- Gatling Good: Gatling goooood.
- Gun And Sword: Practices Kendo.
- The Gunslinger: She carries several different types of firearm with her at all times. Where she keeps them is unknown.
- Hyperspace Arsenal: The girl can pull out guns, grenades, bazookas, and freaking cannons out of nowhere.
- I Was Just Passing Through: Takes this to ridiculous extremes with Kojiro.
- Luminescent Blush: Any time she vehemently denies her affections for Kojiro.
- More Dakka: Her firepower seems to be directly proportional to her embarrassment level.
- Small Girl, Big Gun: More like Small Girl, Several Different Types of Big Gun.
- Suspiciously Specific Denial/Twisting the Words: Aside from the usual denials of her affections for Kojiro, she either tends to assume a lot of what her friends expect to become of their relationship, or else spills her personal fantasies in her denials.Fe-chan: "[How's] your relationship with Sasahara-kun?"
Misato: "Why do I have to marry him?!"
Fe-chan: "I didn't say that!"
Misato: "Why does it have to be a daughter and then a son?!"
- Tsundere: Taken to a parodic extremes.
Voiced by: Kazutomi YamamotoA boy whose most prominent feature is a naturally growing mohawk. When not at school, he is a skeptic and seeks to debunk supernatural phenomena. Despite his mohawk making him look like a delinquent, he actually is a fairly nice guy.
- Black Bead Eyes: One of the few characters to have those eyes consistently.
- Beady-Eyed Loser: Become more prominent after he loses his hair
- Butt Monkey: He tends to be on the wrong end of many of Nakamura's Nano-traps.
- Delinquent Hair: Subverted; despite having a mohawk, he's not a delinquent at all and is very down-to-earth (though Weboshi thinks he is a delinquent and likes him because of it). In fact, he didn't even style his hair that way; it grew like that naturally. Later on, he loses his hair.
- Face of a Thug: His mohawk makes him look like a delinquent and a bad guy (In fact, it's the main reason Weboshi likes him), but he's actually a very Nice Guy.
- Heir to the Dojo: And he wants no part of it.
- Magic Versus Science: His lifegoal is to prove that the supernatural doesn't exist.
Voiced by: Kaori SadoharaA girl noted for her very large red ribbon that she wears in her hair. She's fond of trying out new places that she reads about, but tends to find the experiences more confusing than enlightening.
- Animal Motifs: Rabbits. Her hair ribbon gives the appearance of rabbit ears and most of her character song is her saying "pyon" (an onomatopoeia for a rabbit jumping).
- Big "WHAT?!": See Catch Phrase.
- Catch Phrase:
- Expy: Looks very similar to Tsukasa Hiiragi, to the point that her animation model may just be Tsukasa's model tweaked to fit the series' art style (both Lucky Star and Nichijou were both animated by Kyoto Animation, so this isn't far-fetched).
- Hair Decorations: Her Oversized ribbon.
- Only Sane Man: The humor in her sketches comes from her reactions to the insanity that unfolds around her.
Voiced by: Ryouta YoshizakiSon of the C.E.O. of the Daiku Corporation, which runs chains of restaurants and cafes among other things. Created the "Go-Soccer" Club on a whim and has since come to regret it since encountering people actually familiar with the game.
- Club Stub: With Sekiguchi, at least until it turned out there actually was such a thing as Go-Soccer.
- Didn't Think This Through: Daiku didn't know there was actually a sport called "Go-Soccer" when he invented the club.
- Only Sane Man: In comparison to most of the cast, especially in comparison to 3/5ths of the Go-Soccer Club.
- Spoiled Sweet: Rich and spoiled though he may be, he's a Nice Guy.
Voiced by: Ai Hirosaka
For a while she was the only member of the Go-Soccer Club alongside Daiku. However, she shows little interest in anything beyond reading the latest volumes of Helvetica Standard.
- Black Bead Eyes: To emphasize her detachment from her surroundings.
- Cannot Spit It Out: To Daiku.
- Club Stub: With Daiku, at least until it turned out there was such a thing as Go-Soccer.
- Emotionless Girl: Not to Mai's extent, as she's slightly more prone to showing expressions, but she's still emotionless most of the time.
- Not So Stoic: While watching the Go-Soccer match she has Blank White Eyes and has her jaw dropped. Most of the time, however, she keeps her cool.
Voiced by: Takahiro HikamiThe younger brother of teacher Izumi Sakurai. He was surprised to learn his school had an Go-Soccer club and eagerly joined. To Daiku's shock, however, Makoto takes his Go-Soccer ''very'' seriously.
- Eyes Always Shut: Even when shocked, his eyes remain shut.
- Wrestler in All of Us: Performs a German Suplex on himself, if that makes sense.
Voiced by: Kouta YamaguchiA student with an afro. Appears more often in the background than as a speaking character.
- Funny Afro: His defining trait
- Hammerspace Hair: In one gag he is seen pulling out numerous things from his Afro including Sakurai-sensei's favourite treat.
Voiced by: Youko TamaokiOne of Misato's friends. She is attracted to Nakanojou.
- All Girls Want Bad Boys: She likes Tsuyoshi because she thinks he's a delinquent.
- Last Name Basis: Manga chapter 142 introduces the Sakurais' writer father and his editor, also referred to as Weboshi, suggesting that it actually is their last name or both have the same nickname.
- Only Known by Their Nickname: Like Fecchan, her real name is never mentioned.
Voiced by: Yumi HiguchiOne of Misato's best friends. A bit of a ditz.
- Butt Monkey: Not quite on Yuuko and Sakamoto's level, but still.
- Genki Girl: Not to the extent of other examples of the trope, but she is nonetheless energetic.
- Only Known by Their Nickname: Neither her first name or her given name are mentioned at any point.
- The Pollyanna: Attempted to be one in one episode. A combination of bad luck and clumsiness quickly put an end to that.
Voiced by: Manami HondaMisato's younger sister. She's in middle school and is a member of the kendo club. Her response to the absurdities that surround her is barely contained laughter. She's fully aware of Misato's feelings for Sasahara.
- Bratty Half-Pint: She can barely contain laughter when someone embarasses themselves, and likes to tease her sister every now and then about her feelings for Sasahara.
- The Resenter: Towards 'that damned genius' Yoshino Naganohara regarding her kendo skill.
Voiced by: Ryouta TakeuchiA member of the Go-Soccer club, and one of the few people who are actually familiar with the rules of the game.
Voiced by: Mami KosugeA timid teacher who became a guidance counselor as much to improve herself as her students. She tends to get flustered very easily, and has a hard time actually disciplining students. The elder sister of Makoto Sakurai.
- Adorkable: Mainly due to being a Shrinking Violet.
- Apologizes a Lot: She's so shy that she will often apologize for no reason when talking to people.
- Covert Pervert:
- Played with in Episode 23: after she discovers a porn magazine in her brother's room, she decides to take a peek to see if it is, and blushes even more than usual.
- She also enjoyed one of Mio's drawings when the girl presented it as something "cool", enough that she put it on a test.
- Girlish Pigtails: On her day off in Episode 21.
- Nice Girl: She and Nano are quite possibly the nicest characters in the manga.
- Sensei-chan: She's quite easy to mistake for a student before she is formally introduced.
- Shrinking Violet: Unless she's around her younger brother.
- Tears of Joy: She wipes at her eyes when Yuuko says that she wants to be a teacher just like her in episode 23.
- Terrible Artist: Her drawings tend to look more like cute and childish versions of whatever they're supposed to represent. And much to Mio's dismay, she also tends to consider Yuuko's drawings "cool".
Voiced by: Tetsu InadaA teacher at the high school. Frequently on Yuuko's case regarding her inability to do her homework. He harbors a crush on Izumi Sakurai. His imagination tends to run wild when he's speaking to her. He's also sponsor for the Go-Soccer Club, blackmailed by Makoto.
- Big "WHAT?!": Occasionally goes back and forth in an "Eeeehhhh?!" exchange with Annaka.
- Cannot Spit It Out: To Izumi. Everytime he tries to even talk to her, he quickly turns into a stuttering mess.
- Freudian Slip: When trying to act cool with Izumi he flat out asks her if she has a boyfriend. When he later tries to talk to Makoto, Izumi's younger brother, he asks him the same thing. Both instances end predictably.
- Gratuitous English: Prone to bursting into it when he messes up.
- I'm a Man; I Can't Help It: Why he allows himself to be bribednote into being the Go-Soccer Club's advisor.
- Imagine Spot: Often, and always involving Izumi.
- Large Ham: Especially when Izumi is the subject matter.
- Mr. Imagination: Keeps getting caught up in Imagine Spots involving one Izumi Sakurai.
- Not So Above It All: Comes off as a normal teacher at first.
Voiced by: Kaoru MizuharaA science teacher who managed to figure out that Nano's a robot. Confused about why Nano would be enrolled in school instead of announced to the world, she has made it a point to capture Nano and study her. Her schemes always end up backfiring.
- Accent Upon The Wrong Syllable: Tends to happen when she gets excited.
- And Call Him "George"!: Has no idea how to care for cats.
- Butt Monkey: Again, not quite on Yuuko or Sakamoto's level, but she still qualifies.
- Chekhov's Gunman: In Episode 3, she was looking for her cat Taisho. note
- Epic Fail: She is the Epic Fail personified. Few people ever fall for their own Poisoned Chalice Switcheroo twice.
- Gratuitous English: During her visit to the Shinonome household."SHOULDER BLOCK!"
- Heel–Face Turn: Going by chapter 172 of the manga, by the time the Professor is in high school, Nakamura stops trying to kidnap Nano and instead takes up residence in the Shinonome household itself to learn from the Professor directly.
- Hoist By Her Own Petard: Her attempts at the Poisoned Chalice Switcheroo both failed because she drank the coffee she herself drugged.
- Innocent Innuendo: "I've come to learn more about you, Shinonome"!
- Kindhearted Cat Lover: Played with. She likes Taisho, but has absolutely no idea how to treat him.
- Mad Scientist: It's not really known whether she is in other aspects (though she is implied to have tried to drug students before), but she is so obsessed with kidnapping Nano to figure out how she works that she easily qualifies.
- Not Again: People's reactions when they learn she's passed out. Implying she's either incredibly careless, or has tried to drug students before.
- Pit Trap: Another of her schemes to catch Nano. Predictably it fails.
- Poisoned Chalice Switcheroo: She inflicts this on herself in Episode 15. Twice and no one was there the second time.
- Serious Business: Everything, especially if it involves Nano.
- Stalker Without A Crush: To Nano.
- Tsundere: Maybe since she gets flustered every time someone calls her cute.
- In the later manga chapters, she's specifically tsundere for Takasaki, thanks to multiple random events leading her to think he has a crush on her.
- You Gotta Have Blue Hair
Voiced by: Yuichi Nagashima (a.k.a. Cho)The school principal who often tells old jokes that no one gets. He has also suplexed a deer.
- Cannot Tell a Joke: Though unlike Yuuko's which are plain terrible, his jokes are simply way outdated.
- Crazy-Prepared: Wore a bullet-proof vest when trying to catch a deer.
- Dodgy Toupee: It's more prone to wobbling around to and fro (and sometimes fall off altogether) than staying in place. Also, despite what you might initially expect, that's it he's wearing there in the picture to the right! It covers only the sides and back of his head while still leaving the top bald.
- Epic Fail: He tries to moonsault during his "fight" with a deer. He fails miserably and lands face first on the ground.
- No Name Given: Initially. According to the Vice-Principal in Episode 26, his surname is Shinonome.
- Wrestler in All of Us: He took out a deer with a German Suplex.
Voiced by: Hiroshi NakaThe Vice Principal of the high school. His sad life is brightened by visits from his little grandson Micchan... until Micchan does something that leaves him sadder than before. Seems to dislike the Principal.
Voiced by: Motoko KobayashiMio's elder sister. An immature young woman fond of playing pranks on people she comes across, especially her sister. She attends college and is skilled at kendo.
- Big Sister Bully: To Mio, who responds with violence.
- The Gadfly: Especially, though not exclusively, towards her sister.
- Genius Ditz: In kendo, at least, as Misato and Mihoshi think. According to the latter, Yoshino claims training in kendo makes her weaker.
TamamuraA girl who works at the Daiku Cafe. She's very timid and has a hard time explaining things when her customers are angry or flustered.
- Shrinking Violet: Almost on Sakurai-sensei's level.
Nakanojou, Sr., the Daifuku Guy
Voiced by: Hirokazu HiramatsuRuns a daifuku stall on the streets of town. He takes selling Daifuku very seriously, and insists on model behavior from the people he hires to be his daifuku mascots. Like his son, he has a natural mohawk. Though his has grown long enough that he can fake a normal hairstyle with it.
- Serious Business: Selling daifuku.
Voiced by: Kaoru MizuharaThe Vice Principal's grandson. The Vice Principal anticipates his visits, but Micchan always ends up doing something to horrify his grandpa, such as trying to get him to eat mudpies.
- Chekhov's Gunman: You can see him making said mudpies in the background of the nagashi somen scene.
Voiced by: Daisuke OnoA random crow that the Professor brings home. She puts Sakamoto's scarf on it so it can speak.
- The Charmer: Instantly wins over Nano and Professor.
- Crows And Ravens: Guess which. Then again, he's cone-shaped, so it's harder to tell.
- Non-Standard Character Design: Most birds are either realistically drawn or look a bit like marshmallow peeps. This one is cone-shaped.
Voiced by: Etsuko KozakuraA robot made by the Professor. He runs on biscuits. An improvement over Biscuit #1, whose head flew off.
- The Unfavorite: He was only made to impress Nano, so he gets neglected often.
BuddyA dog who has sometimes appeared before Yuuko to offer a comforting paw when things are especially rough on the girl. Is sometimes accompanied by a puppy, Kobuddy.
- Throw the Humans a Bone: Buddy performs this service for Yuuko.
Hajime SakuraiIzumi and Makoto's dad. He's a respected writer, but very sleepy all the time. His editor attributes this to Hajime losing his wife at a younger age, and thus having to deal with writing and housework at the same time. As he first appeared in chapter 142, he doesn't get to make an appearance in the anime.
The Fey Kingdom
A king, princess, and their soldiers who fly high above the world in a zeppelin. Their adventures are really just elaborate dreams on Yuuko's part. Or are they?
Voiced by: Tamio OhkiRuler of the Fey Kingdom. He decided to take a trip around the world on a zeppelin, providing Dolph the chance he needed to grab power. He carries one of the two wood cubes which can be used to resurrect an ancient weapon.
- Pointy Ears: Naturally, given his elfin background.
Voiced by: Noriko HidakaPrincess of the Fey Kingdom. She holds the second wood cube needed to resurrect an ancient weapon. She manages to keep it hidden from Dolph until his rebellion fails. She holds the Mooks' turning on her and her father against them.
- Pointy Ears: Same as her father.
- Trap Door: She has the Mooks try to entertain her in one sketch. This is the penalty when they fail.
- Trash Talk: Dolph describes her speech as vulgar, contradictory to her appearance.
- You Have Failed To Entertain Me: Drops her henchmen via Trap Door when they fail to entertain her.
Voiced by: Takaya HashiAn officer in the Fey Kingdom's army, adopted and raised by King Albert. Despite his grand plans, his attempt at rebellion ultimately fails due to his own clumsiness.
- Death by Falling Over: "His attempt at rebellion ultimately fails due to his own clumsiness" is not an exaggeration.
- Blown Across The Corridor: In Episode 21, Number 8 gets blasted so hard that he ricochets against the walls until he goes full turn and hits Mio in the back.
- Death as Comedy: Their individual deaths tend to be Played for Laughs more often than not.
- Elite Mook: Number 8 is always the one that inadvertently snaps Yuuko into reality.
- Also, every mook who doesn't have a number on their cap. In theory.
- Epic Fail: Word of advice: if you find yourself in possession of the two artifacts that might make you king of the land, don't put them on the sill of a window of a moving airship.
- Face Framed in Shadow: Even if the viewer can see beneath their green caps, their eyes are never visible.
- Mass "Oh, Crap!": After Dolph accidentally killed himself.
- No Name Given: Some of them are given nicknames, the rest are given numbers as names, but neither of them have actual names.
- Redshirt Army: Well, Green Jacket, that is.
- You Are Number 6: The only way to distinguish individual mooks is by the number on their hats or, in the case of ranked or nicknamed members, the kanji. They refer to themselves by their numbers, too.
A manga often seen being read by characters, as well as an actual manga by Keiichi Arawi. Some episodes have Helvetica Standard segments of their own.With the exception of Pino, none of these names are "official", merely descriptive. Character entries are reserved for characters who have appeared in more than one Helvetica Standard sketch.
The Clueless ShinigamiA Shinigami who doesn't understand how to read the atmosphere of a situation. Once had his scythe stolen by the Poverty-Stricken Tengu.
- I Do Not Speak Non Verbal: The first Helvetica Standard skit has him asking what "KY"note refers to. His captain answers "You."
- Shinigami: Though he more closely resembles The Grim Reaper.