!!Tomoko Kuroki
->'''Voiced by:''' Creator/IzumiKitta (Japanese), Creator/MonicaRial (English)

The main character of the series, who struggles with becoming "popular", making friends and coping with adolescence. Unfortunately, this is not helped by her [[NoSocialSkills social ineptitude]] and [[{{Jerkass}} unpleasant]] [[TheEeyore personality]].

Despite being incredibly anti-social, she craves the companionship and attention of others. She suffers from a raging superiority complex, [[IndulgentFantasySegue vivid delusions of grandeur]], intense self-loathing, and social anxiety so severe that she can barely get out a sentence when talking to someone she is not intimately acquainted with.

The dark circles under her eyes are genetic (and shared by her brother).
* ACupAngst
* {{Adorkable}}: In spades, when her {{Jerkass}} tendencies aren't in play.
* AllGirlsWantBadBoys: Although she doesn't actually hook up with a "bad boy", she seems to be fond of BastardBoyfriend characters, as evidenced by her enjoyment of a drama CD about {{Yandere}} boys.
* AmbiguouslyBi: Has pretty obvious sexual lust for Yuu, as well as being shown enjoying the memory of a stranger's panties. That said, she is constantly trying to get with boys, including her own brother, and she enjoys {{Otome Game}}s as well as BastardBoyfriend characters. Amusingly, while thinking about what it would be like to be with another girl, Tomoko thinks that her harassment of Yuu is totally normal. It could be argued that Tomoko has been very confused by all those [[HGame H-Games]] she has played. In chapter 51 she sees the YuriGenre SchoolgirlLesbians RomanticTwoGirlFriendship with Yuu as something natural and normal, and so too the BrotherSisterIncest with Tomoki, but she doesn't actively think about getting with girls the way she does about getting a boyfriend, or see herself as a lesbian... until it's a chance to be popular.
* AnnoyingYoungerSibling: Acts like one for Tomoki despite actually being older. [[spoiler:According to the volume 5 omake it was her obnoxiousness that caused their once-loving relationship to turn sour. On the other hand, one WhatIf omake shows that he would end up disliking her even if she were to remain kind to him.]]
* ButtMonkey: Any of her attempts to become popular ''always'' come out wrong for her.
* CharacterDevelopment: Albeit slowly. By her second year, she's dialing down her schemes to become "popular" and noticed by everyone, just aiming to befriend and talk to people. She's also become more comfortable at cafés and other public places. [[spoiler:However, she's also reignited an old feud with a middle-school classmate who ended up in the same school as her.]]
* ChronicVillainy: She's never managed to break her bad habit of doing {{Jerkass}} things.
* ClassicalAntiHero: She doesn't do anything and often is just a jerkass to everyone for whatever reason she can come up with.
* ClingyJealousGirl: When it comes to Yuu or her brother, the latter of which she declared if he ever brought home a girl, she would take responsibility and ''[[{{Yandere}} kill her]]''.
* CosmicPlaything: She doesn't realize it, which might be a good thing as the truth might plunge her into the pit of despair or worse, since she can't realize why her attempts to make friends are massive failures.
* CovertPervert: Played with; since the viewers are always privy to her thoughts, it's easy for us to see that she's ''very'' perverted, but most other characters (aside from Tomoki) are unaware of how perverted she really is.
* DesperatelyCravesAffection: To the point of making BrotherSisterIncest overtures, with Tomoki none too pleased. Also part of why she's so attached to her only real friend Yuu, besides the HomoeroticSubtext.
* {{Determinator}}: Despite the universe doing [[CosmicPlaything everything it can]] to make her give up.
* DontYouDarePityMe: As shown in chapters 33 and 42, she does not like it when others take pity on her, as she feels patronized by this.
* EeriePaleSkinnedBrunette
* TheEeyore: She falls into bouts of self-loathing and has a lot of negative thoughts in social situations.
* ExhaustedEyeBags: Seems to be a family trait; however, Tomoko's habit of staying up late at night probably doesn't help, as she notes [[{{Meganekko}} before trying on glasses to hide them]].
* {{Expy}}[=/=]DistaffCounterpart: Downplayed ''very hard''. An {{otaku}} LoserProtagonist who's a master of {{Dating Sim}}s and has [[NoSocialSkills near-zero communication skills]]? Sounds a lot like a gender-flipped fusion of [[Manga/TheWorldGodOnlyKnows Keima Katsuragi]] and [[Anime/WelcomeToTheNHK Tatsuhiro Satou]]. But unlike Keima, who is a loner by choice and is perfectly capable of dating real girls in much the same way as fictional ones (given enough encouragement, or coercion for that matter), or Satou, who eventually outgrew his {{Hikikomori}} ways, Tomoko [[CringeComedy repeatedly fails at socializing in real life]].
* FailureHero[=/=]FailureIsTheOnlyOption: [[TropesAreNotBad Done rather well.]] She can't do ''anything'' right. Every time she has a goal it's bound to fail or backfire horribly.
** The few ThrowTheDogABone moments she gets are usually down to luck and the kindness of others, or when she's not actually trying so hard to become popular.
* FoolishSiblingResponsibleSibling: The Foolish to Tomoki's Responsible.
* FriendToAllChildren: She is fond of kids and enjoys their company. This is PlayedForDrama, since it serves as a reminder that she doesn't have any friends of her own age.
* GamerChick
* {{Gonk}}: Often, when emotional.
** There was also the time where she tried to change her appearance, which worked out well until she decided to mess with her face.
* GreenEyedMonster: She enjoys the misfortune of others and frequently wishes for horrible things to happen to people that she perceives as having happy carefree lives. She also does have big green eyes, and calls girls more socially successful than herself, including her best friend Yuu, "bitches", "sluts", etc.
--> '''Tomoko:''' ''"If you're not a worthless god, I'd like to see you try and make me happy... If you can't manage that, at least make everyone as unhappy as me. If you can't, it's fine I guess... But I'll despise you forever..."''
** Also why she couldn't get along with Kotomi in middle-school despite being much alike, as she wanted to keep Yuu to herself.
* HollywoodNerd: ''Mostly'' averted. She's an introverted shut-in, with the disheveled appearance and complete lack of social skills to highlight it. In a departure from the archetype, she's also not particularly accomplished academically.
* {{Hypocrite}}: She angrily denounces anyone more popular than her as shallow, vapid and selfish, and refers to any girls more sociable than her as "sluts". She's the real shallow and selfish one, who seeks popularity above all else, and proclaims: "Without doing anything, I can get into the pants of the boys for three years!" in the very first chapter.
* IJustWantToHaveFriends: ...and get laid, apparently.
** As the series progresses, there's a subtle development in that Tomoko's goal moves down from "getting popular" to just "making a friend", and at the very least "talking to people".
* IneffectualDeathThreat: Frequently wishes death and worse on her classmates for the smallest of offences, like someone apparently taking her umbrella.
* InferioritySuperiorityComplex: While she's rather self-centered and looks down on a lot of people for petty reasons, it's still clear that her self-esteem is actually very, very low.
* InnerMonologue: Keeps her thoughts to herself more often than actually speaking.
* InSeriesNickname: "Mokocchi"
* IronicName: Depending on what kanji you spell it with, the name "Tomoko" can mean "beautiful girl" or "wise child", among others. Needless to say, she's neither of these things.
* {{Jerkass}}: Downplayed. In the main series, she can come off as a condescending jackass who can occasionally show humility and self-esteem, although she most often keeps her negativity to herself. However, Tomoki and Komiyama tend to see and feel the more unpleasant side of Tomoko.
* LittleBigSister: She's considerably shorter than her younger brother. Not very unusual given he's only a year younger, but it still highlights her immaturity.
* LonersAreFreaks: Her mindset, which she desperately wants to avoid.
* LoserProtagonist
* ManipulativeBitch: She tries. Dear lord, she tries.
* MeaningfulName: "Kuroki" can literally mean "black mood". It sums up the character pretty well…
* NerdsAreVirgins: Several storylines are about Tomoko's lack of experience and sexual frustration.
* NeverMyFault: Zigzagged. She often derides herself and finds faults with her social skills and appearance, but never dwells on it and immediately finds something else to blame for her social failings.
* NoSocialSkills: Pretty much the entire conflict of the plot.
* {{Otaku}}: of Otome games. So much that she attempts to socialize in real life with tactics from the games. See the {{Expy}}/DistaffCounterpart entry for details.
* PeekABangs: Although both of her eyes can occasionally be seen, this trope is largely in play for her through much of the series.
* PersonAsVerb: In Chapter 39 she tries to stand out more in her class by performing a wacky introduction during the first day of second year. For her efforts, among her classmates her name becomes a synonym for [[EpicFail doing something exceptionally poorly.]] Fortunately it seems to have gone out of fashion by Chapter 42.
* PlayboyBunny: Dresses as one in a fantasy sequence (that's a ShoutOut To ''LightNovel/HaruhiSuzumiya''). She somehow manages to make it look ugly and unappealing.
* TheQuietOne: She once went a month and a half without talking to anyone outside her family -- her streak was broken when she managed to tell her teacher "goodbye". Ironically, her inner monologues are highly eloquent.
* ShesAllGrownUp: [[http://www.mangago.me/read-manga/watashi_ga_motenai_no_wa_dou_kangaete_mo_omaera_ga_warui_anthology/bt/207725/Ch6/4/ A page in the anthology]] [[ThrowTheDogABone reveals that she could grow up to be quite pretty.]]
* ShrinkingViolet: Combined with NoSocialSkills, this is the reason she can barely put together a full sentence with anyone she doesn't know.
* SiblingYinYang: With Tomoki.
* SitcomArchNemesis: With Komiyama, whom Tomoko dislikes because she feels that she has to compete with her over Yuu's attention, [[spoiler:later also because she convinced herself that Komiyama is sexually interested in Tomoki, causing Tomoko to be disgusted with her, and, as of chapter 47 of the main story, also because Komiyama admitted that she didn't like Tomoko back in middle school.]]
* SlasherSmile: Pretty much every attempt she makes at smiling ends up coming out as one. Combined with her permanent eye-bags the effect is really unsettling.
* TomatoInTheMirror: Chapter 1: After 5 months trying to convince herself that she is popular, Tomoko literally sees herself at the mirror and admits the horrible truth:
--> ''Now that I look in the mirror after a few years I see that I turned into some creepy entity!''
* UnsympatheticComedyProtagonist: Her portrayal switches between this, CosmicPlaything and some combination of both depending on the chapter. She can be very pitiable, but at the same time rather self-centered, condescending (especially to her classmates, though this is restricted to her {{Inner Monologue}}s and never expressed outwardly) and, in Chapter 33, is shown to be a devotee of [[ComedicSociopathy schadenfreude]]. In the spinoff she is portrayed much more unsympathetically than in the main story.
* WideEyesAndShrunkenIrises: She has this expression a lot.
* WrongGenreSavvy: One of the major factors behind her inability to adapt to society is the fact that she tends to "learn" social skills through anime and video games, and mistakes many character interactions therein (including those that are, from an objective viewpoint, downright outlandish) for actual practice, and tries to emulate them in real life, which more often than not only serves to further humiliate her.
* YouAreWhatYouHate: The reason she despises Kotomi. Both are antisocial and their OnlyFriend is Yuu. Each one of them believes the other is below her.

!!Tomoki Kuroki
->'''Voiced by:''' YuuichiNakamura (Japanese), Creator/DavidMatranga (English)

Tomoko's younger and more responsible brother. He is a fairly average and well-adjusted person for his age, and treats his sister with the usual level of sibling-related intolerance. Despite this, he ''does'' care for his sister and tries to support her when she needs it.
* AnnoyingYoungerSibling: Played with. He does tend to get on Tomoko's nerves, though not so much due to obnoxiousness as due to the fact that he's guilty of such "crimes" as staying home sick while Tomoko has to go to school, having friends who care enough to visit him while he's sick, or cleaning his own room and making his lunch himself (much to their mother's praise - and unlike his sister, and thus making her look bad in comparison). Also inverted, as Tomoki definitely sees Tomoko as his annoying ''older'' sibling.
* TheBeautifulGame: A player and fan of football/soccer.
* BigLittleBrother: He's considerably taller and more down-to-earth than his older sister.
* ChickMagnet: Appears somewhat popular with girls, among which is Komiyama, who's older than he is.
* DeadpanSnarker: In response to Tomoko's antics.
* ExhaustedEyeBags: Like his mother and sister, although their mother's are less pronounced.
* {{Expy}}: Of sorts to [[LightNovel/OreNoImoutoGaKonnaNiKawaiiWakeGaNai Kyousuke Kousaka]].
* FaceOfAThug: Interestingly, while he has this look, he's still fairly popular at his school, since he seems to have regular friends and two girls bring him the class printout when he gets sick.
* FacePalmOfDoom: When ticked off, he simply grips his sister's head really hard.
* FatherIWantToMarryMyBrother: In a home video their mom found in episode 7, he said as a little kid he wanted to marry Tomoko. He was notably disturbed when he saw this video (also because of how much more affectionate he was towards her).
* FoolishSiblingResponsibleSibling: The Responsible to Tomoko's Foolish.
* JerkWithAHeartOfGold: Tends to physically rein in his sister if needed. That said, deep down he is a generally good-natured guy.
* NotSoDifferent: [[spoiler:Subverted in Chapter 41. Tomoko visits him in his classroom and sees him sitting alone and by himself; this gives her the impression that he is a loner just like her. However, when she visits him later she finds out that he is actually very popular in class and has not only friends but also admirers. Tomoko doesn't take the revelation well.]]
* PerpetualFrowner: He's always wearing a grumpy expression of some sort, at least around his sister.
* PetTheDog: Sometimes he takes pity on Tomoko.
* SiblingYinYang: With Tomoko.
* StraightMan: Serves as this whenever he shares a scene with his sister.
* WouldHitAGirl: He's not above lashing out when Tomoko's getting on his nerves (giving her a kick, grabbing her face, etc.). He invoked [[WouldntHitAGirl the other trope]] one time Tomoko was annoying him. Then when her antics went too far, he had no choice but to strike her into calming down.

!!Yuu Naruse
->Voiced by: Creator/KanaHanazawa (Japanese), Creator/EmilyNeves (English)

Tomoko's best friend from middle school, who managed the transition to adolescence far more gracefully than Tomoko. She was originally very quiet and nerdy; however, after moving to high school she dyed her hair, improved her fashion sense and personal appearance, became more outgoing and eventually got a steady boyfriend. Despite changing so much, she remains a kind friend to Tomoko, though she remains blissfully oblivious to how different their social lives are and is unaware of the more unpleasant aspects of Tomoko's personality.

She is the protagonist of the spin-off manga ''It's Your Fault My Friend's Not Popular'', which details her middle-school life with Tomoko from her perspective.
* AttentionDeficitOohShiny: In the final episode of the anime, she starts to chase after a distraught Tomoko out of concern for her but ends up being distracted by a cat.
* BrainlessBeauty: Despite her beauty and kindness, she's oblivious to Tomoko's unsavory nature and has below average grades. In the second Christmas special Tomoko opines that even using Twitter or keeping a blog would be too complicated for Yuu to handle. She also remains oblivious to the animosity between Tomoko and Kotomi [[spoiler:until chapter 54 of the main story]].
* CoolPet: In chapter 64, while catching bugs with Tomoko and Kotomi, she manages to catch a [[https://en.wikipedia.org/wiki/Dynastinae rhinoceros beetle]]. Tomoko and Kotomi comment on its coolness and rarity, and Tomoko convinces Yuu to keep it as a pet.
* CovertPervert: One thing she ''isn't'' oblivious about is innuendo.
* DecoyProtagonist: In the spin-off she is set up as the protagonist at first, but the narrative focus eventually moves from her to Tomoko and Komiyama, and the story is mostly about the two's "[[SitcomArchNemesis friendship]]".
* DumbBlonde: Her hair is dyed, but otherwise applies.
* EroticDream: [[spoiler: Implied in chapter 7 of the spin-off. Tomoko and Kotomi are pretty delighted by it.]]
* EvenTheGirlsWantHer: Tomoko and Kotomi both have pretty obvious crushes on her in middle school and separate high schools have done little to ebb their lust.
* {{Foil}}: To Tomoko, also to Kotomi. She had been, initially, shy like her two friends but was able to overcome it and build a social life, unlike Tomoko. In middle school she already had a hidden natural beauty that drew attention. Most importantly, she has shown negative feelings towards other people the least, unlike her friends.
* TheGlassesGottaGo: After taking her glasses off, her popularity soared.
* [[spoiler: GreenEyedMonster: Surprisingly, in chapter 57! She deals with it in a completely different way than Tomoko, though.]]
* TheHeart: She is pretty much the only reason Tomoko and Kotomi even talk to each other, and also the only reason they are willing to be civil when they do talk. [[spoiler: In chapter 54 she takes an active role to the trope.]]
* InnocentlyInsensitive: Her casual remarks indicating that she has a much more fulfilling social life than Tomoko can hope for, including having a boyfriend, cause Tomoko a lot of distress.
** Komiyama was also hit with this, in chapter 6 of the spin-off.
* {{Meganekko}}: Wore glasses in middle school. Still wears them at home.
* MsFanservice: Or at least this is how Tomoko sees her.
* NiceGirl: Overall, a pretty nice and sweet (if somewhat airheaded) person.
* ObliviousToLove: Doesn't notice Tomoko's crush on her.
* OnlyFriend: Of Tomoko, who even admits this in one of her {{Inner Monologue}}s in chapter 29.
* OpaqueNerdGlasses: In anime flashbacks, though her eyes are visible in both manga.
* {{Otaku}}
** ClosetOtaku
* RapunzelHair: In middle school.
* StupidGood: Her niceness can be very high when it comes to her friends. For example, when they were in the pool:
--> '''Tomoko:''' [[spoiler: ''"If I peed in here, would you pull away from me?"'']]\\
'''Yuu:''' [[spoiler: ''"I wouldn't. Because we're friends."'']]
* ZettaiRyouiki: Type A, when wearing her school uniform and working at her uncle's cafe.

!!Kotomi Komiyama
->'''Voiced by:''' KaoriMizuhashi

One of Yuu's old middle-school friends. She immediately takes a dislike to Tomoko, who sees Kotomi as a rival for Yuu's attention. Unfortunately, Kotomi proves to be just as passive-aggressive and anti-social as Tomoko.

Kotomi is formally introduced in the spin-off manga ''It's Your Fault My Friend's Not Popular'', and later on she is re-introduced in the main series. Kotomi does not appear in the anime as it only adapts stories from before her first appearance. However, she appears in a special {{OVA}}, bundled with the Japanese release of the main series's seventh volume.
* ACupAngst
* AlliterativeName
* AscendedExtra: She first appeared in Tomoko's flashback to her middle-school years in Chapter 30 of the main series as the third, unnamed girl running the the marathon with Tomoko and Yuu; she's only seen in three frames and has no speaking lines. In the spin-off series, starting with Chapter 2, she is one of the main characters. She then makes her formal debut in the main manga in Chapter 46.
* BerserkButton: Badmouthing her crush Tomoki, as Tomoko found out in chapter 54.
* {{Bookworm}}
* CovertPervert: Revealed to be one in Chapter 7 of the spin-off, though she is in denial about it.
* CrossPoppingVeins: When Tomoko pisses her off. Which is often.
* {{Foil}}: To Tomoko. She's basically her but more proper looking and with more common sense.
* GameOfNerds: Her conversations with Tomoko and Yuu in Chapter 4 and 9 of the spin-off show that she is a baseball fan.
* InSeriesNickname: "Komi-something". Also: "Glasses". Both given by Tomoko.
* {{Meganekko}}
** OpaqueNerdGlasses: Sometimes she is presented like this depending on the situation. Her glasses are a little variant of this trope because they are not so big.
* [[spoiler: [[MyParentsAreDead My Father Is Dead]]: Has revealed that her father died from an illness when she was five. Yuu gets awkward, Tomoko... not much.]]
* NotSoDifferent: Apparently neither she nor Tomoko had any friends in their class before befriending Yuu. She and Tomoko both like the same anime, got the same type of hairstyle in Chapter 3 of the spin-off, got insecure with Yuu's beauty in Chapter 4, found themselves unable to talk to guys [[spoiler:and ended up in the same high school. Chapters 47 and 48 of the main manga show her walking home from school alone and eating her lunch in the bathroom, implying that she doesn't have many - possibly even any - friends in high school either]]. Notably this does not make them less hostile towards each other at all.
** Their NotSoDifferent nature is even lampshaded by the title of one of the 4-Komas from Chapter 7 of the spin-off, "Cut from the same cloth".
** [[spoiler: They appear to be showing some small progress when it comes to getting along. They accept having to hang together to be with Yuu during Summer break, and chapter 71 shows them taking a picture together (though it was played off as awkward).]]
* [[OnlySaneMan Only Sane Girl]]: Has more common sense than her two friends.
* {{Otaku}}
* PrecisionFStrike:
--> ''[[InnerMonologue "That fucking bitch!"]]''
* RightInFrontOfMe: In Chapter 2 of the spin-off she tried to break the ice with Tomoko by telling her a story about having a laugh in the previous year when she heard that some middle schooler was still riding a bike with training wheels. Guess who that middle schooler was?
* SitcomArchNemesis: With Tomoko. She dislikes Tomoko because the latter tends to act like a {{Jerkass}} towards her for [[GreenEyedMonster reasons she can't fathom]], and only ever strikes back at her when provoked.
* UnknownRival: When they reunite in Chapter 46 of the main story, Tomoko has forgotten about Kotomi. On the other hand, Kotomi bears a grudge against Tomoko. (The next chapter reveals that they didn't spend all of their middle-school years in the same class.) Now both are aware of the other's dislike.
* WideEyesAndShrunkenIrises: When she is surprised and/or angry.
* WithFriendsLikeThese: Yuu is the only link that makes her and Tomoko tolerate each other.
* YouAreWhatYouHate: The reason she despises Tomoko. Both are antisocial and their OnlyFriend is Yuu. Each one of them believes the other is below her.

->'''Voiced by:''' Creator/RieKugimiya (Japanese), Juliet Simmons (English)

Tomoko and Tomoki's thirteen-year-old cousin and a seventh-grade schoolgirl. Having been fed a steady stream of face-saving lies by Tomoko, she idolises her older cousin.
* AudienceSurrogate: Her reaction to Tomoko's card game.
* BrokenPedestal: How she sees Tomoko after all her attempts to look cool backfires spectacularly on her. Unlike other examples though, she takes the revelation well, and the next time they meet her admiration is replaced not with utter disdain, but with pity and appreciation that at least she tried her best.
* DeathGlare: Pulled one mixed with a ThousandYardStare when she was angry with Tomoko, also...
-->''"No! Just take it."''
** This has become a regular expression for her when she is angry, with an added {{Stepford Smile|r}}.
* InnocentlyInsensitive: She means well when she tries to take care of Tomoko after finding out the truth about her, but so far her actions just drive it home to Tomoko how pathetic she has gotten.
* NiceGirl: An unusual role for a Type-A {{Tsundere}} specialist like Creator/RieKugimiya. She's so nice she doesn't harbor any grudge against Tomoko for unwittingly breaking her good impression of her.
* OnlyKnownByTheirNickname: Until chapter 60, where it's revealed that her name is Kiko.
* ReplacementGoldfish: In chapter 60 Tomoko speculates that Kii tries to take care of her because she treats her as a replacement for her deceased dog. [[spoiler: At the end of that chapter Kii even gives Tomoko that dog's hairpin (the one she is always wearing).]]
* TokenMiniMoe

!!Megumi Imae
->'''Voiced by:''' AiNonaka (Japanese), Juliet Simmons (English)

President of Tomoko's (and later Tomoki's) student council.
* EarlyBirdCameo: In the anime, when she replaces the random girl holding the stack of papers that Tomoko accidentally runs into. Downplayed because this first appearance is an earlier part of the chapter/episode she would appear in.
* [[NiceGuy Nice Girl]]: Some female students mention that she's popular with both boys and girls at the school due to her helpfulness.
* StudentCouncilPresident
* ThrowTheDogABone: [[spoiler:Seeing Tomoko down after Yuu leaves at the end of the school festival, Megumi borrows a mascot costume and gives her a hug and a balloon. In Episode 12, she also mentions having to keep an eye on that "cute girl" after Tomoko ends up getting flustered out of trying to strike up a conversation with her after a gust of wind gave her a good view of Megumi's panties.]]


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