A list of characters of ''LightNovel/SakurasouNoPetNaKanojo'', most of which reside in the titular Sakura Hall, a wooden two-storey house harboring some of the quirkiest students of Suimei University of the Arts High School ("Suiko" in local parlance). Some spoilers for the light novels are left unmarked, so read at your own risk.

!!Sorata Kanda
->'''Voiced by:''' Creator/YoshitsuguMatsuoka
The male protagonist, a insecure second-year high school boy who chose to move to Sakura Hall rather than throw away a stray cat he had found. In there, however, being surrounded by talented yet quirky peers has taken a toll on his ordinary life, more so when he meets Mashiro, who indirectly inspires him to carry on with his dream of developing video games. He lives in Room 101.
* AccidentalPervert: Mostly towards Mashiro, [[InnocentFanserviceGirl who doesn't mind]].
* CantCatchUp: Towards Mashiro, who he feels is leagues above him in a lot of things. A pretty brutal example of this happens in episode 21, when [[spoiler: his game pitch fails again, and then the game company that rejected his proposal sends Mashiro an offer to create characters for their games, without her even trying to do it.]]
* CloudcuckoolandersMinder: What his "Mashiro duty" entails.
* CrazyJealousGuy: Was this when Mashiro and Jin looked like they were on a date.
* DesperatelyLookingForAPurposeInLife: Sorata is continuously awed by people who are sure of what they want.
* DullEyesOfUnhappiness: Briefly in episode 21 after hearing that [[spoiler: his game didn't make it through the final review.]]
* HeroicSelfDeprecation: He already has self-esteem issues, one which isn't helped by landing at a house filled with some of the brightest yet also quirkiest boys and girls in Suiko.
* IJustWantToBeNormal: In the beginning. That's why he wants to leave Sakura Hall ASAP in the first three episodes. Eventually, however...
* IJustWantToBeSpecial: By episode 8 he resolves to be more on this.
* KindHeartedCatLover: By the time he meets Mashiro, he already has ''seven'' cats running around his room.
* LargeHam: Whenever necessary he can be yelling in a very hammy way.
* LoonyFriendsImproveYourPersonality
* NiceGuy
* NotWhatItLooksLike: He is in a lot of these thanks to Mashiro. Often in those situations she will also say things either out of context and/or order, making others (especially [[CovertPervert Nanami]]) think he and Mashiro has done ThisAndThat.
* ObliviousToLove: It takes him a great deal of effort to notice Mashiro's affections and ''never'' catchs on Nanami's.
* OnlySaneMan: Poor guy has to deal with the crazies in his new dorm (including the landlady, no less). The only reason he's even in the Sakura Hall is because the regular dorms won't let him keep a cat. Then, as it turns out, he is also this to his own family. While he does have the traits of this trope, in Sakura Hall, he's not actually the only sane one as there is also Jin and Nanami.
* OrdinaryHighSchoolStudent: He is a pretty average guy who was sent to a QuirkyHousehold for keeping a cat, then had the responsibility of looking after an IdiotSavant dumped on him...
* ParentalAbandonment: He originally lived in the neighborhood with his family, but stays behind in a dorm after his father found a job in Fukuoka, then moved there with both his mother and his little sister Yuuko.
* PerformanceAnxiety: Suffers this in Episode 8 during his presentation for his video game idea. Naturally, this doesn't go very well for him. Subverted come Episode 10, where he performs just fine.
* TheResenter: Occasionally becomes close to this in terms of resenting Mashiro for her talent while his hard work fails him. He ended up lashing out at her a few times, but he managed to prevent himself from becoming this and stayed close friends with her.
* SecondYearProtagonist
* TheSleepless: He suffers from this trope occasionally due to Mashiro sleeping in his room, and especially during the school festival where he was working long hours to ensure his project for it would be done in time.
* StraightMan

!!Mashiro Shiina
->'''Voiced by:''' Creator/AiKayano
The female protagonist, a gifted yet somewhat strange second-year transferee to Suiko after living for many years in England to learn how to draw manga. Early on, she exhibits a total lack of knowledge in any other skill than drawing, including basic hygiene and social skills. For this reason Sorata was assigned as her caretaker. She lives in Room 202.
%%Mashiro should not be assumed to be autistic when troping as that is not canon. The canonical trope IdiotSavant can be used as appropriate.
* {{Adorkable}}: [[LampshadeHanging Lampshaded]] in the opening.
* AmbiguousDisorder: Despite her behavior, it's never outright stated that she has a mental disorder. The closest thing her dormmates did to name her a disorder was for Sorata to call her "special", having been fed up with her antics earlier that day. For nearly all western viewers she has textbook-accurate UsefulNotes/HighFunctioningAutism.
* AnimalMotifs: Cat.
* AnimalsHateHer: While Mashiro seems to like cats, the feeling is not mutual.
* AttentionDeficitOohShiny
* BettyAndVeronica: The Veronica to Nanami's Betty.
* BookDumb: She gets very poor grades, but only because she's unable to pay attention in class. She can easily pass the make-up exams by remembering all of the answers.
* ClingyJealousGirl: Not in an aggresive way, but she doesn't like to see Sorata getting along with other girls such as Nanami, Rita and his sister.
** In Episode 8, Mashiro decides to stay in his room after he says Nanami would get upset seeing her in there. Later, she seems annoyed that Sorata compliments Nanami's bikini, but won't do the same for hers.
** In Episode 9, when Mashiro saw Rita [[BedmateReveal lying on top of Sorata]], her only interactions with him for the next few hours was calling him "idiot" each time they pass each other. Later, after clearing things up, she invites Rita [[spoiler:-- whom she previously kicked out the dorm --]] to sleep in her room to prevent a repeat of said incident.
** In episode 18, while walking with Sorata and Nanami to see if Yuuko passed her entrance exam for their school, she has an inkling that Sorata and Nanami like each other, and changes the tone of her voice enough that both of them notice she's upset.
* {{Cloudcuckoolander}}: Her train of thoughts and behaviour are very off, to say the least. Thus Chihiro-sensei assigns Sorata as her CloudcuckoolandersMinder.
* DefrostingIceQueen: Sorata's influence makes her way more socially adept and helps her understand emotions more. However, when her editor talks to Sorata about Mashiro changing and starting to become more "normal", Sorata says he actually liked Mashiro better back when she was just an IdiotSavant who only thought about drawing her manga, since he sees her sudden interesting in things like cooking as her "slacking off" (not realizing she's doing it for him).
* EmotionlessGirl: She has a very flat affect and doesn't understand the concept of emotions too well.
* FirstNameBasis: Demands that her friends call her by her given name.
* HairOfGoldHeartOfGold
* HeyYou: Due to lack of social skills, she ''never'' uses JapaneseHonorifics. Partially justifiable by spending most of her youth in Britain.
* IdiotSavant: One of the very few Japanese examples that does not involve martial arts. She doesn't seem to know how to clothe herself decently on her own, nor does she have much common sense, such as when she opens a snack and eats it in the store ''before paying for it''. However, she is an extremely talented artist and devotes heavily to that field of study.
* InnocentCohabitation: Plans to live with Sorata after graduation.
* InnocentFanserviceGirl: Seems to lack the sense of dressing herself up properly, ''especially'' regarding underwear.
* InnocentInnuendo: Very common as well, ''also'' due to her complete lack of social skills.
** Episode 2: Sorata's been her first... male friend.
** Episode 5: She pretty much implied she has been doing ThisAndThat with Sorata all night--''in front of Nanami''--while that "this and that" was merely playing video games.
* InnocentlyInsensitive:
** Tends to speak embarrassing and/or insulting things to other characters in a matter-of-fact tone, without considering how would they feel. Sorata is currently helping her become more socially adept.
** In a more dramatic way, Mashiro hardly realizes how her talent hurts others. Rita revealed in Episode 10 that as her talent was far ahead of her peers that every one of them except Rita quit in shame. Of course, Mashiro is totally oblivious of that and was shocked of how much Rita resented her.
* InstantExpert: In Episode 5, she completely flops all her tests, including English, much to Sorata's consternation, considering the fact that she spent most of her childhood in Britain. Later she was given some study sheets, and instantly remembers all the information on it, which Sorata briefly tests her on. She later aces all her retests.
* IntelligenceEqualsIsolation: It's not ''intelligence'' per se, but it operates the same way. This trope still applies as of now, as Sorata {{lampshaded}}.
* LiteralMinded: When asked what she was thinking, Mashiro answers instead with ''exactly'' what is she thinking at the moment (such as [[NonSequitur "Of the Earth"]]).
* LonelyAtTheTop
* {{Mangaka}}
* MeaningfulName: "Mashiro" means "pure white". Not only does she have a fairer skin than the rest of the cast, it is pretty clear that Sorata even thought she is "pure to a fault".
* NewTransferStudent
* NoSocialSkills: She knows nothing but drawing and cannot live on her own at all.
* PhotographicMemory: She's awful in verbal memory, but she can remember practically anything if she see it ''visually''. See InstantExpert, above, for an extreme example.
* ReiAyanamiExpy: She is a strange girl, with virtually NoSocialSkills, [[EmotionlessGirl doesn't understand the concept of emotions too well]] and has light hair, fairer skin than the rest of the cast and reddish eyes.
* SecondYearProtagonist
* TheSleepless: Because of her tendency to work heavily on her art into the night, so she goes to bed very late and usually has to be woken up by Sorata.
* SugarAndIcePersonality: She's a sweet and loving girl, just quite emotionally distant and odd.
* ThereAreNoTherapists: People may know she needs help, but nobody thinks she needs to be evaluated.
* ThroughHisStomach: She wants to learn to cook so she can give Sorata a bento. Sorata fails to realize this and thinks she's just slacking off from her work as a mangaka.
* TrademarkFavoriteFood: Baumkuchen.
* TrashOfTheTitans: What Sorata found in her room after her first night there. And continues to be so by episode 5; Sorata used this to show Nanami that he is merely her minder.
* TsurimeEyes
* WhatIsThisThingYouCallLove
* WriteWhatYouKnow: InUniverse example. While Mashiro's manga art is impeccable, her storytelling is below par. Her editor Ayano recommended her to do this, and her serialized manga Nanohana-sou is practically what happened in the Sakura Hall at the moment.
* WriteWhoYouKnow: InUniverse example. The characters in her serialized manga Nanohana-sou are based on everyone in Sakura Hall, but gender flipped.

!!Nanami Aoyama
->'''Voiced by:''' MarikoNakatsu
Sorata's classmate, who later transfers to Sakura Hall, another second-year high school girl, and an aspiring voice actress. Because her parents disapprove of her chosen career, she runs away from home, forcing her to work in multiple part-time jobs to earn money so she could transfer to a voice acting school. She lives in Room 203.
* AccentRelapse
* AnimalMotif: Tiger, demonstrated from her stuffed tiger Torajirou and tiger-striped panties. (Interestingly, in Mashiro's manga ''Nanohana-sou''--a replica of what happens in the Sakura Hall--Mashiro's male stand-in is called Tora''ta''rou.)
* BettyAndVeronica: The Betty to Mashiro's Veronica.
* BunnyEarsLawyer: Slightly downplayed compared to the others, but she's strict about everything.
* CannotSpitItOut: She simply can't bring herself to tell Sorata how she feels about him.
* ClingyJealousGirl
** Refuses to talk to Sorata during the first half of Episode 2 due to some out-of-context dialogue regarding Sorata being Mashiro's "first", at least until Mashiro clears it up.
** Again in Episode 5, upon moving to Sakura Hall because she wanted to see what kind of relationship Mashiro and Sorata had, after Mashiro discussed said relationship in a way that made it sound like "dating".
** In episode 9, both her and Mashiro seem a bit upset at Sorata when they see Rita on [[BedmateReveal top of him]] in his room when Nanami goes to wake him up for school.
* CovertPervert: She owns some rather fancy underwear, and her usual reaction whenever confronted by a strange situation is to assume the most perverted possibility.
* HeroicBSOD: [[spoiler:Gets a delayed one of these after finding out she failed her audition. At first, she seemed well-adjusted to the bad news. This was disproved in the next episode when she emotionally broke down in the middle of school.]]
* HopelessSuitor: Towards Sorata. She may have had a chance before Mashiro came into the scene, but...
* IWantMyBelovedToBeHappy: Once she realizes that she doesn't have a chance with Sorata, she lets go of her feelings for him so he can be with Mashiro.
* KansaiRegionalAccent: She [[AccentRelapse slips into it whenever she is angry or flustered]].
* OnlySaneWoman: She feels like she's the only real levelheaded one in Sakura Hall.
* ParentalAbandonment: Inverted -- her parents [[FantasyForbiddingFather object to her aspirations as a voice actress]], and refused to help her pay her way through this. So she ended up moving out, working various jobs to support herself while she attended voice acting school.
* PerpetualPoverty: Due to her self-exile (see ParentalAbandonment, above), she has to pay for all her own bills. By episode 5 she was pretty much in such a state.
* RomanticRunnerUp: Due largely to her being [[CannotSpitItOut unable to confess her feelings]] for Sorata sooner, she falls into this trope. [[spoiler:In episode 22 she essentially gives him a speech that ends up "friend-zoning" herself towards him, but she likely did it because even if she did confess by that point, he'd reject it and would make their friendship awkward.]]
* SecondYearProtagonist
* TheSleepless: Because she's overworking herself by studying and working several jobs. This catches up with her in Episode 6, when she fell ill before her first audition.
* TenderTears
* TomboyishPonytail
* {{Tsundere}}: Type B for Sorata.
* WhyDoYouKeepChangingJobs: She is seen working at several places (at least in one convenience store and one ice cream stall) to earn money for her voice acting career.
* {{Workaholic}}: Best seen in episode 5, when she took up Sorata's "Mashiro Duty" despite all the voice acting training and all the jobs she has.

!!Jin Mitaka
->'''Voiced by:''' Creator/TakahiroSakurai
A third-year student and Misaki's childhood friend. Despite his genuine feelings for Misaki, he feels she is too talented for someone like him, a struggling playwright, so he instead becomes a playboy. He lives in Room 103.
* BestHerToBedHer: Misguidedly subscribes to this trope as something he must do before he can be with Misaki.
* BunnyEarsLawyer
* CantActPervertedTowardALoveInterest: The main reason why he won't do anything sexual to Misaki.
* CantCatchUp: Towards Misaki, who feels his scripts aren't on par with the level of talent Misaki shows in her creations. This is another reason why he constantly brushes off her advances, as he feels he's not good enough for her and would just weigh her down.
* TheCasanova
* ChildhoodFriendRomance: With Misaki.
* ChivalrousPervert: In Episode 3, Sorata tells Jin to return to the dorm to comfort a heartbroken Misaki, who saw him and Mashiro in front of a LoveHotel. He declines, saying he'd be tempted to do perverted things to Misaki were he to see her like that, which he doesn't want.
* CommitmentIssues: He loves Misaki a lot, but the mere thought of a serious relationship, especially with someone so talented like her, is far too scary for him.
* CrazyJealousGuy: REALLY does not like the idea of Misaki being with another guy, even if it's just hypothetically suggested.
* FatalFlaw: Is smart, mature, and cool. But is deeply afraid and insecure about a potential romance with Misaki, which causes quite a bit of pain for both of them (and their friends). [[spoiler: He eventually overcomes this though.]]
* HandsomeLech
* IgnoreTheFanservice: He blatantly ignores Misaki's advances.
* InsecureLoveInterest: The reason he plays TheCasanova. While he ''does'' have feelings for Misaki and remains loyal to her, he feels he's not good enough to be with her, due to her talents, such as in animation, and feels he would just [[TheLoad weigh her down]] if he tried to have a serious relationship with her. This despite the obvious signs that Misaki really wants to be with him.
* LadykillerInLove: Towards Misaki. In a twist, his feelings for Misaki are the ''reason'' he's TheCasanova in the first place, since it's his way to deal with his inferiority complex towards Misaki.
* SempaiKohai: As Sorata's sempai, he often givens him advice on different people which often turns out of be accurate.
* SettleForSibling: He dated Misaki's sister Fuuka because he didn't consider himself good enough for Misaki. They broke up because Fuuka was tired of being his ReplacementGoldfish.
* ShipperOnDeck: He's constantly trying to encourage Nanami to confess her feelings to Sorata, even when it becomes obvious that the latter is interested in Mashiro.
* StoicSpectacles: He sports a pair of those.
* TallDarkAndHandsome

!!Misaki Kamiigusa
->'''Voiced by:''' NatsumiTakamori
A third-year student, Jin's childhood friend, and a hyperactive artist, whose obsession with anime and manga forced Suiko's higher-ups to send her over to Sakura Hall. She is openly in love with Jin, despite the latter's womanizing habits. She lives in Room 201.
* TheAce: She is quite smart, and fairly good at everything she does, to the point that she even made a short anime single-handedly.
* AnimalMotif: Bears; she seems to be a fan of a nameless bear mascot.
* BlushSticker: She sports these occasionally, and during the opening credits.
* BunnyEarsLawyer
* BuxomIsBetter
* ChildhoodFriendRomance: With Jin.
* ClingyJealousGirl: When she sees Jin and Mashiro standing in front of a love hotel. She invokes this trope again in episode 9 when Jin openly hits on Rita, despite Rita turning him down.
* {{Cloudcuckoolander}}: Her {{otaku}} and GenkiGirl tendencies make her one.
* CryCute: Breaks down crying when seeing Jin and Mashiro in front of a love hotel.
* DoggedNiceGirl: To Jin. She's been openly in love with him for years and his [[TheCasanova Casanova]] front clearly does not change her opinion of him a bit. Her advances can be overly aggressive sometimes, though.
* DrivesLikeCrazy: In Episode 7. Becomes a crucial skill in episode 12 when they attempt to make their way to the airport after hearing Mashiro is leaving.
* FastRoping: She installs a rope from her window, from which dangles a makeshift lift which she uses to drop into Sorata's room.
* FriendToAllChildren: She's popular with the kids and invited many kids to Sakura Hall's {{Tanabata}} event. Chihiro suspects that's because she's just like them mentally.
* GamerChick: She frequently goes to Sorata's room to play video games with him.
* GenkiGirl: Her general attitude when not involving the subject of Jin in the topic.
* GreenEyedEpiphany: She apparently didn't realize she was in love with Jin until he began dating her sister.
* HotBlooded
* IdiotHair
* InnocentlyInsensitive
* IntelligenceEqualsIsolation: Like Mashiro, it's not ''intelligence'' per se, but it operates the same way. Her incredible talent and BunnyEarsLawyer behaviour made it hard for her to find any friends when she was younger and complicated her relationship with Jin.
* IWillWaitForYou: Subverted. Jin gave her a marriage certificate with his signature on it as a promise to come back to her so they could go to city hall together, but she doesn't hesitate to sign it and turn it into city hall shortly after he leaves for college, making them officially married.
* LargeHam: She tends to do this when she gets excited, such as when she was taking the driving test in episode 7, and constantly calls her instructor "Nancy".
* LoveHurts: Her love for Jin brings her much heartbreak, due to his [[TheCasanova womanizing ways]] and the fact that he always seems to brush off her advances.
* MotorMouth: She tends to sound this way at times when she's excited.
* OtakuSurrogate: She is famous for her incredible artistic talent, but is also notorious for her obsession with anime and manga, thus the reason she gets transferred into Sakura Hall.
* PerpetualSmiler: Her smile will only drop when her relationship with Jin is brought into question.
* ShamelessFanserviceGirl: Is not afraid to show herself off to Jin, despite his apparent lack of interest.
* SiblingTriangle: She and her older sister Fuuka both liked Jin. Due to Jin's inferiority complex towards Misaki and Misaki not realizing her feelings for him back then, Jin started dating Fuuka, but they eventually broke up since Fuuka knew she was just his ReplacementGoldfish and Jin would always love Misaki the most. Even now, Misaki mistakenly believes Jin favors her sister over her.
* UncannyFamilyResemblance: Her and her sister are practically identical despite being a few years apart.

!!Ryuunosuke Akasaka
->'''Voiced by:''' Creator/YuiHorie
An second-year boy (yes, that's a he) and a talented computer programmer... who just happens to be a shut-in, communicating only with his dormmates through "Maid", an AI program he developed (and whose avatar Misaki created). Eventually he comes out of his room and starts attending Suiko. He lives in Room 102.
* AllergicToLove
* BelligerentSexualTension: With Rita.
* BrutalHonesty: He did not hide why he comes out to attend classes (to obtain enough attendance points to go to college), and, of course, towards Rita in episode 10, when he sees right through her "[[StepfordSmiler fake smile]]" and tells it like he sees it. It doesn't [[BerserkButton go very well with her.]]
* BunnyEarsLawyer
* CrossdressingVoices: And a rare one for Creator/YuiHorie, too.
* DeadpanSnarker
* DraggedIntoDrag: He's once forced into a maid outfit.
* DudeLooksLikeALady: Due to his long hair, which he doesn't bother to cut.
* GadgeteerGenius: He develops most of Suiko's gadgets, including "Maid".
* HatesBeingTouched: By women, that is. In fact, he doesn't even like being within close proximity of them.
* HeManWomanHater: Poor guy suffers from gynophobia. Which makes it all the more dire for him when Rita falls in love with him.
* HeWhoMustNotBeSeen: Until his formal introduction in Episode 9, his only interaction with his dormmates are through "Maid".
* {{Hikikomori}}: Is objectively aware of this fact.
* HimeCut
* IneffectualLoner: [[spoiler:He once had friends and was working on a game with them, but his InsufferableGenius tendencies and the fact he was more skilled than any of them could hope to be eventually caused them to gradually step away from him, until he was left alone.]]
* InsufferableGenius: When he finally shows up in Suiko after five months, Ryuunosuke doesn't even bother listening to the teacher's lecture. He also eats tomatoes loudly in class, which the teacher finds irritating.
* IntelligenceEqualsIsolation: The reason behind his attitude.
* JerkWithAHeartOfGold
* LongHairedPrettyBoy
* MeaningfulName: "Ryu" means "dragon", his InSeriesNickname.
* NoGuyWantsToBeChased: He clearly doesn't appreciate Rita hitting on him. Justified due to his gynophobia.
* PostKissCatatonia
* RapunzelHair
* SecondYearProtagonist
* TheReasonYouSuckSpeech: In Episode 10, after Rita explains how she failed to meet expectations due to being overshadowed by Mashiro, Ryuunosuke calls her out on trying to appease others' expectations of her more than following her true desire.
* TrademarkFavoriteFood: Tomatoes
* {{Tsundere}}: He clearly has a thing for Rita, but he absolutely refuses to admit it and treats her as an annoyance.
* TsurimeEyes

!!Chihiro Sengoku
->'''Voiced by:''' Creator/MegumiToyoguchi
Mashiro's cousin, landlady of Sakura Hall, and an art teacher at Suiko. Despite that, she's more interested in drinking and dating. She's also irresponsible towards her special cousin, forcing Sorata to become her caretaker, and even then she'd give him improper, irrational advice.
* AdaptationDyeJob: Is clearly blonde in the light novels. She is strangely made red-haired in the anime, possibly to better contrast her from Mashiro.
* BunnyEarsLawyer: Used to be an aspiring artist back when she was her tenants' age, but has since become a teacher instead.
* CatSmile: She displays one in Episode 2 when talking to Sorata at school.
* ChristmasCake
* HardDrinkingPartyGirl
* HotTeacher: Even Jin can't resist feeling her up.
-->'''Jin:''' "[[BlatantLies Sorry, they happen to be there to latch on to.]]"
* {{Landlady}}
* LazyBum
* ParentalNeglect: She just dumps Mashiro on Sorata even knowing she needs professional help 24/7.
* {{Sensei-chan}}

!!Rita Ainsworth
->'''Voiced by:''' AyakoKawasumi
Mashiro's former handler during her stay in England. She was also an aspiring artist, but, driven by envy over Mashiro's superior talent, Rita "encourages" her to transfer to Japan to draw manga. Soon she regrets her decision, so she travels to Japan to persuade Mashiro to return with her, all to no avail. She eventually returns home, but not before making a most curious acquaintance in the form of Ryuunosuke.
* TheAtoner: Comes to Japan to try to bring Mashiro back to England after regretting her decision to send her to Japan.
* BelligerentSexualTension: With Ryuunosuke.
* BrokenBird: She always felt inferior to Mashiro's talent in art, and came to despise it as a result.
* CantCatchUp: The reason she is envious of Mashiro, and actually warned Sorata of the same thing.
* CloudcuckoolandersMinder: Towards Mashiro during the latter's time in England.
* CryCute: Breaks down in tears in Mashiro's arms in Episode 10 after the latter allays her fears of being unneeded by confessing that she feels complete when painting with Rita.
* DarkAndTroubledPast: Failure to meet others' expectations, compounded by being constantly one-upped by Mashiro, forced her to stop painting. Ryuunosuke [[WhatTheHellHero calls her out on it]], noting how she failed to consider what she ''really'' wanted to do.
* ForcefulKiss
* GenreSavvy: She knew Sorata would come outside looking for her when she first visits Sakura Hall. Later she tells Sorata to go to a hotel with her, knowing full well that [[ClingyJealousGirl Nanami and Mashiro]] would attempt to [[DatePeepers spy on them,]] and greets the two girls at the entrance.
* GreenEyedMonster: In Episode 9, she tells Sorata about how she used to paint, until constant overshadowing by Mashiro forced her to stop. She also delivered that message in a tone that implies she still harbors some resentment against Mashiro.
* ILoveYouBecauseICantControlYou
* LoveAtFirstPunch: Finds herself strangely attracted to Ryuunosuke after the latter saw through her "fake smile" and then called her out on her FreudianExcuse for stopping her artistic career. Alas, Ryuunosuke is gynophobic.
* PhenotypeStereotype
* RejectionAffection
* TheResenter: To this day, she admits she still feels some resentment towards Mashiro and her talents.
* ShamelessFanserviceGirl: Has absolutely no problem with showing off her body in front of Ryuunosuke, or sending him a suggestive picture of her by mail.
* StepfordSmiler
* TheTease: Towards Sorata and Ryuunosuke (mostly the latter).

!!Yuuko Kanda
->'''Voiced by:''' YuiOgura
Sorata's younger sister and a third-year junior high school girl who looks too young for her age. [[spoiler:She enters Suiko and stays in the Sakura Hall in the seventh book of the novels.]]
* ACupAngst: She goes through this while [[SkinshipGrope groping]] Mashiro and Nanami in Episode 7. Jin tries to cheer her up by yelling that she'll get bigger come high school.
* AnnoyingYoungerSibling: Visited Sorata at a most inopportune time (just when he was waiting for the results of his video game thesis) to pester him with questions regarding school life after some out-of-context conversation with their mother over Sorata's relationship with Mashiro.
* BigBrotherAttraction: Towards Sorata.
* ClingyJealousGirl: Almost instantly disliked Mashiro and Nanami for taking up most of her brother's time, though she eventually softens up to Mashiro after she comes to understand the latter's condition.
* TheDitz
* {{Fangirl}}: Of Mashiro, after finding out that the blonde is the author of her favorite manga (''Nanohana-sou'').
* GenkiGirl
* IllGirl: She ''was'' one, and her BigBrotherAttraction came from the fact that Sorata looked after her a lot at the time.
* OlderThanSheLooks: She's a ninth grader--two years behind Sorata--meaning she's actually around 13-14 years old. She looks no older than a grade-school kid.
* TokenMiniMoe: Stands out as the smallest character of the principal cast.

->'''Voiced by:''' Creator/YuiHorie (Credited as "???")
Ryuunosuke's AI program and automated mail filtering system, with an avatar created by Misaki. As time passed Ryuunosuke constantly upgrades her abilities, including giving her partial autonomy.
* ArtificialIntelligence
* [[BecomeARealBoy Become a Real Girl]]: Ryuunosuke's long-term goal for her is to turn her into a RidiculouslyHumanRobot.
* BlushSticker
* ClingyJealousGirl: When Rita started showing affection for her creator Ryuunosuke, the latter, [[NoGuyWantsToBeChased ever the gynophobic]], chooses to spare himself the inconvenience of having to directly communicate with Rita by having "Maid" filter all her messages and love letters... who proceeds to start an online FlameWar with her.
* GrewBeyondTheirProgramming: Thanks to Ryuunosuke's updates, her auto-filtering ability soon expanded into autonomous filtering, rapid word-learning, facial expression recognition, virus creation, and even hacking.
* MulticoloredHair: Sports red hair which turns dark brown on the ends.
* RobotMaid: Her avatar, complete with a tail-like appendage ending with a USB plug.

!Daichi Miyahara
->Voiced by: Taishi Murata

Sorata and Nanami friend and classmate. He has a crush on Nanami.

* HopelessSuitor
* IWantMyBelovedToBeHappy: Upon learning Nanami has feelings for Sorata, he completely surrenders.
* MistakenForGay: With Sorata in episode 9. All of the girls immediately assume HoYay between them.

!Souichirou Tatebayashi
->Voiced by: Creator/SatoshiHino

The StudentCouncilPresident of Suimei High. Has some history with Jin

* StoicSpectacles
* StudentCouncilPresident
* VitriolicBestBuds: Has this type of relationship with Jin. Though most of the hostility comes from him, in which Jin blatantly ignores.

!Kazuki Fujisawa
->Voiced by: ShintaroAsanuma

A game designer and a [[spoiler:former tenant of Sakurasou. Has a crush on Chihiro]]

* {{Megane}}
* MentorArchetype: Becomes one towards Sorata for a brief time.

%%!Sorata's mother
%%->Voiced by: SatomiArai