Yuno is a soft-spoken, friendly girl from Room 201 who tries to get along with anybody she meets. Initially painfully shy, she slowly breaks out of her shell thanks to Miyako, with whom she soon forms a deep friendship. She does not have much confidence in her skills as an artist, even though she manages to do very well at Yamabuki High (and she might be somewhat forgiven considering her friend's intellect). She loves drawing and painting the most and considers those her main skills. She constantly worries about being considered an adult, which isn't helped by her comparatively short stature. Her trademark accessory is her X-shaped hair clip, which she rarely takes off.
A-Cup Angst: Albeit not as self-conscious about it as Sae, mainly because she's more concerned about her height.
Character Development: This being Yuno's Coming of Age Story, she has to show some of this. Compare the sketchbook incident where she had a garbage pile of woe and her response towards her abysmal results in the sketching competition, and one would notice in the latter that she has been able to stop thinking negatively because it's going circular.
Cuteness Overload: Yuno's love for cute things is already listed in the character sketches, but this girl certainly has some weird reactions towards cute things, such as petting paint brushes after thinking about the animals their bristles came from.
Cuteness Proximity: "She likes cute things," comes right out of her bio at the start of each manga volume.
Yuno's best friend and next-door neighbor from Room 202, Miyako is bubbly and cheerful to the point of ditziness. Nevertheless, she's also thoughtful and considerate, especially toward Yuno. She takes life's happenings in stride and likes to drag the other girls along for the ride. She is the most talented member of the main cast and can easily come up with interesting works (or interpretations thereof), but is often plagued by lack of cash, so she always tries to save money, falling just short of mooching off the other girls. Her symbol is a cat's paw, in line with her independent personality.
Attention Deficit... Ooh, Shiny!: Subverted — her ADHD-esque behavior doesn't seem to affect her functionality; she appears to be the most talented among the Four Girl Ensemble, both artistically and academically. Yes, she has the attention deficit and hyperactivity, but not the dysfunction.
Book Dumb: Subverted — she may seem to be ADHD-afflicted, but her grades back in junior high were so exceptionally good she exempted the academic portion of Yamabuki's entrance exams. It's just that others believe her "I came in through the back door" joke. This subversion was lampshaded in character sketches:
"Surprisingly, she does good in school!"
Cry Cute: After Sae and Hiro move out, she enters Sae's empty apartment to eat some leftover food in the fridge, realizes they're really gone, and quietly breaks down.
Does Not Like Shoes: Miyako is shown walking barefoot, carrying her shoes and socks, on the cover of the OST. Also, in the sports day episode, she competes in her bare feet for no explored reason.
Genki Girl: While she's prone to sleeping in class and can sometimes sleep for twelve hours in one go, once she is awake, she's quite energetic. One episode shows her coming into Yuno's apartment, showing no signs of having awakened two minutes ago; another has Yuno pointing out that she's hyper even in the morning. "That was quick!" is a common reaction to her actions, whether she's eating or making (usually impromptu) art. But despite all her teasing, she's a likable person, a good friend... and surprisingly does well in school.
Idiots Cannot Catch Colds: She may be a Genius Ditz, but she is still invoked this once to herself, when Yuno fell ill, and even when she was in the admission interview of Yamabuki.
Lampshaded in the Fever Dream Episode (and the corresponding manga chapter), when all the eight classmates around Miyako were struck down with the flu.
Innocently Insensitive: At least some of the time, particularly with regard to Hiro's weight and eating habits.
The Nicknamer: Slightly. Mainly by way of using unusual or made-up honorifics and other suffixes; she almost invariably calls Yuno by "Yunocchi", and on at least one occasion used "Yuno-dono"; meanwhile, she settles on "Norippe" for Nori, except on the occasion that she uses "Norisuke".
Perpetual Poverty: She's generally low on cash, such that in one strip, since she didn't even have 300 yen for lunch, she decided to drink water instead. Her apartment has the lowest rent because of damages, including a leaky roof.
Hiro lives at Room 101 and is, together with Sae, Yuno and Miyako's senior at Yamabuki High. She is a gentle, warm girl and mother-figure to the other girls at Hidamari Apartments. She loves cooking and other girls often assemble at her room for some feast. Her extremely close relationship with Sae at times makes the other girls tease her for acting like Sae's "wife". She constantly worries about her weight and is often on a diet, even though that doesn't go well with her culinary hobby and love of sweets. Hiro's symbol is a silhouette of her fluffy hair.
Hiro's best friend and next-door neighbor from Room 102, as well as Yuno and Miyako's senior. She is a good writer and can often be found pulling all-nighters in an effort to meet yet another deadline. Luckily she can rely on Hiro to take care of her in such times of need. Since she's rather masculine, she often teasingly gets called Hiro's "husband", which embarrasses her highly. Sae's symbol is her pair of glasses, establishing her as the more intellectual of the girls.
A-Cup Angst: Most noticeable in her rant when she and her classmate baked cream puffs, as well as her response when Hiro and Yuno discuss her choice of '2D arts'.
Urban Legend Love Life: As a writer of romance novels, her co-tenants naturally question her love life. She claimed to have had eight boyfriends in junior high, needing to switch everyday, if not having wait lists. While the rest of the characters realize that it is a bit too ridiculous to be true, they are nice enough not to call her out on it.
Nori from Room 103 is one of the latest batch of newcomers at the Hidamari Apartments together with Nazuna, with whom she soon became best friends. She is energetic and outgoing, but also has a somewhat sarcastic streak. Her reputation as a computer whiz quickly garners her the respect from the other girls. Although she usually speaks "normal" Japanese, she also masters the Kansai regional accent, which becomes evident when she converses with a friend from her hometown. Her symbol is a computer mouse, since she is the only girl who knows how to deal with computers.
Crazy-Prepared: She knows more about Sae and Hiro's new apartment complex than they do. She also has a manual ready for running Matsuri's welcome party.
Flat "What.": She's the only cast member who ever really makes this kind of face, and almost every time involves Nazuna in some way. The lone exception so far involved the Landlady.
Incredibly Lame Pun: She almost has a freak out when creating some wordplay on "curtain" and realizing either no one would get it or it's not that good.
Innocently Insensitive: Often ends up snarking too much for the comfort of others, though she tries (and often fails) to rectify any problem that would arise.
Kansai Regional Accent: Exposes this when talking with a friend over her computer. This also shows up on her daily speech once a while, but otherwise she usually hides it pretty well.
Moment Killer: Though she doesn't have many quirks, she often tends to freely speak her mind on what she observes, sometimes unintentionally ruining the mood by saying one thing too many in conversations. Sometimes she catches herself after she does this and tries to rectify things, only to end up further killing the mood.
Only Sane Man: She can be said to be devoid of any personality quirks, especially compared to other tenants.
Together with Nori, Nazuna from Room 203 is among a new batch of tenants in the Hidamari Apartments. She's shy and withdrawn, to an even greater degree than Yuno, and often needs encouragement from other girls for daily activities. The fact that she was abandoned by her parents at the Apartments only makes things worse. She's very popular with the boys, but rarely seems to act upon it. She does not attend Yamabuki's art department, despite general interest in the other girls' activities. She has her hair bands as a symbol.
A-Cup Angst: Illustrated perfectly in the manga-only chapter where she's chosen as the female model for Yamabuki's school uniform and pads her top.
Parental Abandonment: Nazuna lives near Yamabuki, so why is she living in Hidamari now? Her father was transferred and her mother decided that her teenage daughter was better suited to living alone than her husband, a grown man. So she decided to go with him, and left Nazuna to fend for herself.
Miyako and Yuno's homeroom teacher. An exuberant young woman who often gets into hijinks which frequently provoke the Principal's scorn. She loves to dress up in self-made costumes and posing on holiday cards for her students, earning her a reputation for eccentricity. Still, she has her heart in the right place and is always very concerned about the wellbeing of her students. For instance, she has no qualms posing in front of her students to help them along with an assignment — naked, if needed.
Bunny-Ears Lawyer: The reason she is still in Yamabuki, despite the Principal's disdain for her childish antics, was because the latter acknowledges her great teaching talents.
Christmas Cake: Downplayed and implied, in episode 11 of Honeycomb. Yuno, Miyako and a few other classmates look at one of Yoshinoya's old school album and it says that she is the first to get marry. They immediately closed the book.
Cosplay Otaku Girl: She uses her cosplay tendencies for everything from modeling for her art class to making personalized greeting cards. She is very offended, however, at the suggestion that this is cosplay.
Ditzy Genius: She may be the most exaggerated airhead in the entire cast but she's a one-woman sweatshop.
Woman Child: She lives with her parents, has a younger brother who's already a husband and father, has outright declared she's always seventeen, and is freaked out at the prospect that Yuno might mature earlier than her.
Reasonable Authority Figure: While he's clearly disparaging of Yoshinoya's childish antics, he nevertheless tolerates out of respect for her passion with her job. He gives some pretty inspirational speeches as well, though the students (being students) never seem to catch on.