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.
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?
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.
A 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.
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.
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.
A 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.
The lengths she'll go to in order to deny her love for Koji—*boom*
Voiced by: Chika Horikawa
A 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.
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.
More Dakka: Her firepower seems to be directly proportional to her embarrassment level.
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.
A 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.
Son 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 untill it turned out there was such a thing as Go-Soccer.
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.
Voiced by: Yumi Higuchi
One of Misato's best friends. A bit of a ditz.
Butt Monkey: Not quite on Yuuko and Sakamoto's level, but still.
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 Honda
Misato'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 Takeuchi
A member of the Go-Soccer club, and one of the few people who are actually familiar with the rules of the game.
A 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.
A 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.
Cannot Spit It Out: To Izumi. Everytime he tries to even talk to her, he quickly turns into a stuttering mess.
A 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.
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 tried to drug students before.
Pit Trap: Another of her schemes to catch Nano. Predictably it fails.
The Vice Principal of the high school. He 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.
Runs 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.
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 Ohki
Ruler 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.
Princess 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.
The men who serve the king and princess on the Fey Kingdom Zeppelin. They wear identical uniforms of slacks with green jackets and caps, and are distinguished by the numbers on their hats. Number Eight is usually the centerpiece in skits featuring the zeppelin.
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.
Mauve Shirt: Number 8. Case in point, he's the only mook to take on Mio and live.
You Are Number Six: 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. Some episodes have Helvetica Standard segments of their own.With the exception of Chirashizushi, 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 Shinigami
A 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 "Kuuki Yomenai", the inability to read social situations, translated as Clueless in some fansubs refers to. His captain answers "You."
An angel. Tries to help others when she can and owns a very powerful toaster.
A kind landlady who isn't so kind to tenants who are behind on rent.
A Tengu who has sometimes resorted to theft to get enough money to eat.