A list of characters of Sakurasou no Pet na Kanojo, 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.
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.
Can't Catch Up: 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 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.
Not What It Looks Like: 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 Nanami) think he and Mashiro has done This and That.
Oblivious to Love: It takes him a great deal of effort to notice Mashiro's affections and never catchs on Nanami's.
Only Sane Man: 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.
Parental Abandonment: 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.
Performance Anxiety: 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.
The Resenter: 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.
The Sleepless: 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.
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.
Ambiguous Disorder: 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 High Functioning Autism.
Book Dumb: 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.
Clingy Jealous Girl: 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 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 — 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.
Defrosting Ice Queen: 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 Idiot Savant 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).
Emotionless Girl: She has a very flat affect and doesn't understand the concept of emotions too well.
Hey, You!: Due to lack of social skills, she never uses Japanese Honorifics. Partially justifiable by spending most of her youth in Britain.
Idiot Savant: 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.
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.
Instant Expert: 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.
Write What You Know: In-Universe 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.
Write Who You Know: In-Universe example. The characters in her serialized manga Nanohana-sou are based on everyone in Sakura Hall, but gender flipped.
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.
Animal Motif: 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 Toratarou.)
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 top of him in his room when Nanami goes to wake him up for school.
Covert Pervert: She owns some rather fancy underwear, and her usual reaction whenever confronted by a strange situation is to assume the most perverted possibility.
Heroic BSOD: 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.
Hopeless Suitor: Towards Sorata. She may have had a chance before Mashiro came into the scene, but...
I Want My Beloved to Be Happy: 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.
Romantic Runner-Up: Due largely to her being unable to confess her feelings for Sorata sooner, she falls into this trope. 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.
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.
Best Her to Bed Her: Misguidedly subscribes to this trope as something he must do before he can be with Misaki.
Can't Catch Up: 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.
Chivalrous Pervert: 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 Love Hotel. 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.
Commitment Issues: 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.
Crazy Jealous Guy: REALLY does not like the idea of Misaki being with another guy, even if it's just hypothetically suggested.
Fatal Flaw: 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). He eventually overcomes this though.
Insecure Love Interest: The reason he plays The Casanova. 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 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.
Ladykiller in Love: Towards Misaki. In a twist, his feelings for Misaki are the reason he's The Casanova in the first place, since it's his way to deal with his inferiority complex towards Misaki.
Sempai/Kohai: As Sorata's sempai, he often givens him advice on different people which often turns out of be accurate.
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.
The Ace: She is quite smart, and fairly good at everything she does, to the point that she even made a short anime single-handedly.
Animal Motif: Bears; she seems to be a fan of a nameless bear mascot.
Blush Sticker: She sports these occasionally, and during the opening credits.
Intelligence Equals Isolation: Like Mashiro, it's not intelligence per se, but it operates the same way. Her incredible talent and Bunny-Ears Lawyer behaviour made it hard for her to find any friends when she was younger and complicated her relationship with Jin.
I Will Wait for You: 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.
Large Ham: 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".
Love Hurts: Her love for Jin brings her much heartbreak, due to his womanizing ways and the fact that he always seems to brush off her advances.
Motor Mouth: She tends to sound this way at times when she's excited.
Otaku Surrogate: 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.
Perpetual Smiler: Her smile will only drop when her relationship with Jin is brought into question.
Sibling Triangle: 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 Replacement Goldfish and Jin would always love Misaki the most. Even now, Misaki mistakenly believes Jin favors her sister over her.
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.
Brutal Honesty: 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 "fake smile" and tells it like he sees it. It doesn't go very well with her.
Ineffectual Loner: He once had friends and was working on a game with them, but his Insufferable Genius 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.
Insufferable Genius: 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.
"The Reason You Suck" Speech: 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.
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.
Adaptation Dye-Job: Is clearly blonde in the light novels. She is strangely made red-haired in the anime, possibly to better contrast her from Mashiro.
Bunny-Ears Lawyer: Used to be an aspiring artist back when she was her tenants' age, but has since become a teacher instead.
Cat Smile: She displays one in Episode 2 when talking to Sorata at school.
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.
The Atoner: Comes to Japan to try to bring Mashiro back to England after regretting her decision to send her to Japan.
Cry Cute: 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.
Dark and Troubled Past: Failure to meet others' expectations, compounded by being constantly one-upped by Mashiro, forced her to stop painting. Ryuunosuke calls her out on it, noting how she failed to consider what she really wanted to do.
Genre Savvy: 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 Nanami and Mashiro would attempt to spy on them, and greets the two girls at the entrance.
Green-Eyed Monster: 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.
Love at First Punch: Finds herself strangely attracted to Ryuunosuke after the latter saw through her "fake smile" and then called her out on her Freudian Excuse for stopping her artistic career. Alas, Ryuunosuke is gynophobic.
Sorata's younger sister and a third-year junior high school girl who looks too young for her age. She enters Suiko and stays in the Sakura Hall in the seventh book of the novels.
A-Cup Angst: She goes through this while groping Mashiro and Nanami in Episode 7. Jin tries to cheer her up by yelling that she'll get bigger come high school.
Annoying Younger Sibling: 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.
Clingy Jealous Girl: 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.
Clingy Jealous Girl: When Rita started showing affection for her creator Ryuunosuke, the latter, 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 Flame War with her.
Grew Beyond Their Programming: 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.