History Characters / OsomatsuSan

** Todomatsu: Looks like Osomatsu but has shinier eyes and a distinct CatSmile. He also wears flood pants that cause him to appear slightly trendier-looking than his brothers.

* CatSmile: Possesses a small cat-like smirk at all times.

* KavorkaMan: The surprising success of the first season causes them to gain hundreds of adoring fangirls in the second season opening segment, while they've used their riches to turn into {{Fat Bastard}}s](or in Ichimatsu's case [[LeanAndMean an emaciated corpse]]) with even ''worse'' personalities than they normally do. Averted outside of this segment, where they CannotTalkToWomen, let alone get a date with any.

* {{Cuckoosnarker}}: Develops this trait in later seasons

* Cuckoosnarker: Develops this trait in later seasons

* CatSmile: His default expression, which fits with how he [[TheFakeCutie tries to act cute and innocent]] but is actually very conniving.

* BewareTheNiceOnes: "Kerosene" establishes that he can be just as horrible as his brothers when it comes to certain matters -- such as refilling the kerosene tank. Not only does he feign sleep so that no one will ask him to, but he eventually just ''orders'' Choromatsu to do it instead.

* HiddenHeartOfGold: The movie reveals that Jyushimatsu pretended to be a deliquent in high school but wasn't very good at it from changing back to a smile when he thought no one was looking and not zipping up his pants so his butt was showing.

* SpellMyNameWithAnS: In most official material, his romanized name is spelled as "Jushimatsu" or "Jyushimatsu" (which is what Crunchyroll went with), but his name can also be spelled "Jyuushimatsu" or "Juushimatsu".

** In terms of his relationship with his brothers, Jyushimatsu is the closest to Ichimatsu as the latter is usually the only brother capable of being anywhere near the former's wavelength with his quirks like obsessing over cats and ''abruptly transforming into one himself'' on occasion being the most obvious examples.

* WideEyesAndShrunkenIrises: Part of his default expression.

* MatureYoungerSibling: To a minor degree. He's still an immature {{Manchild}} like the rest of the sextuplets, but compared to his brothers, he's the most socially adept.

* AscendedExtra: This is done gradually. She makes only a few appearances in Season 1, while in Season 2 she mainly appears alongside Totoko as her SatelliteCharacter rival. Season 3 gives her HiddenDepths that flesh her out beyond her relationship with Totoko and features her in nearly every episode, effectively making her a full-fledged member of the show's supporting cast.

* TheGenericGuy: While he has his own personality, his defining traits (being lazy, childish and perverted) are simply more exaggerated versions of qualities that all of his other brothers display, causing him to be the least distinct of the six. This gets lampshaded when the group is forced to paint each other's faces after turning invisible, where, while all of the others are given stylistic representations of their most iconic personality traits, Osomatsu's brothers struggle to come up with anything to emphasize for him, eventually leading to them giving him a relatively accurate recreation of his actual face simply by trying to make it look as shitty and unremarkable as possible.

** In the movie he goes crazy over high school Totoko and middle school Nyaa, to the point [[{{Cloudcuckoolander}} Jyushimatsu]] has to act as the voice of reason.

** His behavior towards Totoko and Nyaa-chan in the movie can be considered this. In the memory world, he lusts after high school Totoko and ''junior-high'' Nyaa-chan, while he himself is an adult in his 20's. This is made even creepier by the fact that seeing them makes him want to live in the memory world forever, implying that not only is he ''attracted'' to the child versions of his crushes, he actually ''prefers'' them to their adult counterparts. [[EveryoneHasStandards Even his brothers are creeped out by this]].

** In the movie he goes crazy over high school Totoko to the point [[{{Cloudcuckoolander}} Jyushimatsu]] has to act as the voice of reason.

** Even when Kamimatsu manages to convince their parents not to be too hard on the sextuplets for not having a job yet, saying that everybody has their own pace, the sextuplets still decide to try and kill him.

** Osomatsu and Todomatsu" shows that he can’t talk to girls without bringing up sex in one way or another. [[BerserkButton Todomatsu has none of it.]]

* TheFriendNobodyLikes: A subtler example than Karamatsu. While his younger brothers aren't vocal about it, all of them view him as [[TheLoad a useless older brother whose laziness and unreliability drags them down as a group and prevents them from growing as people]]. When pressured to choose which of his brothers to send to a [=NEET=] correctional facility, Choromatsu chose him for this exact reason. What keeps Osomatsu's brothers from being very open about their negative view of him is the fact that, to a certain extent, all five of them are glad that with him around bringing them down collectively, they don't have to attempt to improve themselves individually.

** This trait gets followed up again in Season 2's penultimate episode "Cherry Blossoms" where, after a hospital scare concerning their father, it's ''Osomatsu'' who [[OOCIsSeriousBusiness uncharacteristically]] convinces his brothers it's time they buckle down and get jobs. He actually stays true to his worth but still gets depressed over time that it seems like sextuplets are starting to drift apart due to their new responsibilities.

** He's the only person concerned about Choromatsu's inability to sleep in "Tidbits Collection", offering to sing him a lullaby each time one of the others wake him up.

** In "The Life of Chibita's Flower", he dates an ugly flower fairy with an abusive and possessive personality. When his brothers confront him about this and tell him to leave her, he says that he has to stay by her side or else she'll be lonely.

The third eldest sibling of the group. He is TheStraightMan for his brothers' antics, and is also an idol {{otaku}}.

* {{Fanboy}}: He's a big fan of Hashimoto Nyan, a cat themed IdolSinger.

* KnowNothingKnowItAll: Believes himself to be the smartest and most capable of his brothers despite the fact that his intelligence is well below-average for his age, he doesn't have any particular talents, and he lacks even the most basic social skills. In fact, the Season 3 skit, "Well, Yeah..." proves that he can sometimes be even dumber than Jyushimatsu and Osomatsu, arguably the two dimmest brothers of the bunch.

* TheReliableOne: Uses his status as the most stable and sensible son as evidence that he will eventually produce a grandchild for his mother as bait to let him continue living with her. This is [[DeconstructedTrope deconstructed]] repeatedly throughout the series, as it's made clear that Choromatsu puts much more effort in cultivating his image as the reliable and sensible son than he does actually doing anything reliable or sensible.

* BeneathTheMask: As the series progresses it becomes increasingly obvious that his apathetic disposition is just an act, and this fact is regularly {{lampshaded}} within the show itself. According to one of his character outlines and [[WordOfGod a cast interview]], the entire purpose of "The Ichimatsu Incident" was to showcase his ''actual'' self.

** In general, its noted that Ichimatsu is very dark and criminal-like by even the actors themselves, and the end-of-the-year special highlights some of his more malicious moments in the series.

** When it's his turn to look after the brothers in "We Caught a Cold", he takes advantage of everyone's disoriented state to act out a sadomasochistic roleplay with them. It's only later on that anyone registers how weird the entire situation was.

* ShrinkingViolet: Has the most trouble with interacting with other people out of the brothers. While he's comfortable around cats, he only barely holds proper social interactions with the rest of his family, and typically fails to do so with anyone else. In "Iyami's Counterattack" he intentionally ''kills himself'' due to the pressure of becoming the main character being too much for him.

* SoreLoser: In "Mahjong", where he shows a very pissy attitude if cornered during the game, flips the mahjong table in frustration (Karamatsu's nickname for him as a player is actually [[ExactlyWhatItSaysOnTheTin Table-Flipping Ichimatsu]], so this seems to be a common occurrence) and suggests that they stop playing and go to sleep immediately after losing, much like a child.

* SugarAndIcePersonality: In his adulthood, he becomes more cold and antisocial towards everyone, but it's clear that he still wants to make connections with other people and very much loves his brothers, even if he doesn't show it most of the time.

* TookALevelInIdealism: Becomes less cynical over the course of the first season. By season two he’s making an effort to avoid self-deprecating thoughts, even arguing with his inner voice when it labels him a loner in “Choromatsu and Ichimatsu”.

* PapaWolf: In "Namnaider", he initially didn't believe Iyami that aliens are replacing people...until he found out the sextuplets were replaced too and made him decide to stop the Namnaiders, with saving his sons being his primary motivation.

* TheFriendsWhoNeverHang: Discussed in the segment "Choromatsu and Ichimatsu", where Choromatsu and Ichimatsu are left alone together for the first time in ''their entire lives''. While they have no problem interacting with each other when the other four are around to buffer them, when it's just the two of them things get incredibly awkward almost immediately. Especially notable, as they're ''identical brothers'', not just friends. Of course, the segment itself also works to avert this by fleshing out how they interact with each other and elaborating on how each of them feels about the other.

* TheFriendsWhoNeverHang: Discussed in the segment "Choromatsu and Ichimatsu", where Choromatsu and Ichimatsu are left alone together for the first time in ''their entire lives''. While they have no problem interacting with each other when the other four are around to buffer them when it's just the two of them things get incredibly awkward almost immediately. Especially notable, as they're ''identical brothers'', not just friends. Of course, the segment itself also works to avert this by fleshing out how they interact with each other and elaborating on how each of them feels about the other.

** They mostly just avoid interacting with their parents entirely, but on the occasions where they do they're shown to act whiny and petulant and only treat them well when they have something to gain from it. This is despite their parents providing for them so that they don't have to work or live on their own. It's especially bad for Matsuzo, who, despite being their sole source of income, goes so far as to ''bully'' when he tries to get them to do something.

* CloudCuckoolander: She can be pretty strange at times. She thought it was a good idea to use ''actual fish'' as the headpiece for her idol costume and kept a teddy bear with a knife sticking out of it in the corner of her room.

* CharacterizationMarchesOn: Much like Todomatsu before her, Nyaa's character has largely become defined by her [[BitchInSheepsClothing two-faced]] personality and [[AlwaysSomeoneBetter love for smugly one-upping]] [[TheRival Totoko]], despite both traits only being revealed during her final major appearance in season 1. Considering that she essentially had no character besides a "cat-themed idol that Choromatsu likes" at first, [[Administrivia/TropesAreTools it's actually fleshed her character out a lot]]. She receives further characterization in Season 3, making her the biggest example of an AscendedExtra in the series.

* ChickMagnet: All of the women at the mixer he and Todomatsu attend to show interest in him.

** Osomatsu: Red panda.
** Karamatsu: Tiger.
** Choromatsu: Sheep.
** Ichimatsu: Cat.
** Jyushimatsu: Dog.
** Todomatsu: Rabbit.

* CoordinatedClothes: Their iconic outfit from ''-Kun'' turns into a two button suit as adults, and they have a variation of it as pajamas. They also have a sweatshirt with the family symbol on it, but the sweatshirt is color-coded for each brother.

* TheFriendsWhoNeverHang: Discussed in the segment "Choromatsu and Ichimatsu", where Choromatsu and Ichimatsu are left alone together for the first time in ''their entire lives''. While they have no problem interacting with each other when the other four are around to buffer them, when it's just the two of them things get incredibly awkward almost immediately. Especially notable, as they're ''identical brothers'', not just friends. Of course, the segment itself also works to avert this by fleshing out how they interact with each other and elaborating on how each of them feels about the other.

** Choromatsu: Has tiny pupils, no IdiotHair and and angular mouth. He also wears a collared shirt under his sweatshirt and has his pant legs rolled up slightly.

** Todomatsu: Looks like Osomatsu but has shinier eyes and a distinct {{cat smile}}. He also wears flood pants that cause him to appear slightly trendier-looking than his brothers.

* LazyBum: One of the primary reasons why none of them have jobs is because they're too lazy to bother to actively try and get one. Even the responsible-seeming Choromatsu admits to spending all of the time he claims to be job hunting masturbating.

* MeetYourEarlyInstallmentWeirdness: A RunningGag has every season open with the brothers in their ''Osomatsu-kun'' days before seguing to their modern day selves. Along with being drawn in a black and white {{Retraux}} style reminiscent of the 1969 Studio Zero adaptation, none of them possess the distinct personality traits brought on by DivergentCharacterEvolution and they all speak with the same nonspecifically boyish tone of voice. It can be very strange hearing [[LargeHam Karamatsu]], [[TheEeyore Ichimatsu]], and [[{{Cloudcuckoolander}} Jyushimatsu]] speak without any of their usual quirks.

* NoSocialSkills: Osomatsu has NoSenseOfPersonalSpace and generally acts like a bratty 12 year old, Karamatsu speaks almost entirely in cheesy and incredibly forced dialogue that makes him painful to listen to, Choromatsu becomes a gibbering mess at the mere ''idea'' of talking to a girl, Ichimatsu can't go through a conversation with a stranger without muttering about how he's going to kill them or himself, and Jyushimatsu is so bizarre that it's close to impossible to have a rational conversation with him. Only Todomatsu has decent social skills, and even then later episodes reveal that that's only really in comparison to his hopeless brothers.

* RepetitiveName: All of them contain the word "Matsu" in the end of their first names and beginning of their last names.

** '''Karamatsu and Todomatsu:''' They wear blue and pink, which can be complimentary to each other and generally represent their SensitiveGuyAndManlyMan status. Karamatsu generally makes himself known to the world and rarely hides anything about himself, while Todomatsu has a lot of feelings and information he'd prefer to hide from others. Both also differ in {{Hidden Depths}}; Karamatsu [[BigEgoHiddenDepths acts arrogant and narcissistic but is actually a nice guy]], while Todomatsu [[BitchInSheepsClothing puts on cute and innocent airs but secretly believes that he's better than the rest of his brothers and goes to great lengths to rise above them in status]]. And while both have a huge desire to talk to girls, Karamatsu can't charm anyone (let alone his own family), while Todomatsu just seems to have [[TheCharmer that natural charm]] and finds it easier to do. Their names are complimentary as well, being the only ones named after actual trees (larch and fir, respectively).

* TallPoppySyndrome: Of the "crabs in a bucket" variety. Rather than try to improve themselves, the Matsus are mostly content to drag anyone with a slightly more fulfilling life than them down to their level. This even, or perhaps especially applies to with each other, which is shown countless times throughout the series.

** They mostly just avoid interacting with their parents entirely, but on the occasions where they do they're shown to act whiny and petulant and only treat them well when they have something to gain from it. This despite their parents providing for them so that they don't have to work or live on their own. It's especially bad for Matsuzo, who, despite being their sole source of income, they go so far as to ''bully'' when he tries to get them to do something.

* UnsympatheticComedyProtagonist: While they're not ''completely'' unsympathetic, the matsu sextuplets are primarily characterized as a group of lazy, emotionally-stunted losers who bring most of their problems upon themselves. The more serious episodes tend to make an effort to show their better sides.

** This trait gets followed up again in Season 2's penultimate episode "Cherry Blossoms" where, after a hospital scare concerning their father, it's ''Osomatsu'' who [[OOCIsSeriousBusiness uncharacteristically]] convinces his brothers it's time they buckle down and get jobs. He actually stays true to his worth, but still gets depressed over time that it seems like sextuplets are starting to drift apart due to their new responsibilities.

* LovableSexManiac: Compared to most of his brothers, he has no problem mustering the confidence to talk to women. This doesn't mean that he's actually ''good'' at talking to them, however, as he believes that trying to grope them and demanding sex are acceptable behavior. When the brothers have to audition for a mixer in "The Star of Hope, Todomatsu", Osomatsu's audition consists of him molesting Todomatsu (the stand-in for the girl) and having to be physically restrained by Choromatsu.

** “Osomatsu and Todomatsu” shows that he can’t talk to girls without bringing up sex in one way or another. [[BerserkButton Todomatsu has none of it.]]
** The movie starts with his brothers doing everything they can to pretend they aren't neets which is ruined the second Osomatsu comes back from the bathroom and even spills they're all virigins without a care of the world, not noticing how literally everyone is shocked at the information.

** When [[spoiler:Choromatsu leaves the house]] in "Letter", the rowdy and chatty Osomatsu is quiet and taciturn. When Totoko asked him on a date, he was too depressed to agree and simply ignored her.

** Season 3 features a segment where the brothers have a hypothetical discussion about what kind of pizza they would order to split between them. Karamatsu stays out of it until the end, at which point he performs his usual LargeHam NiceGuy routine and claims that he'd be happy with whatever kind of pizza his brothers chose. The other five aren't satisified with this as an answer and repeatedly try to probe him to drop the act and state his actual feelings. When he refuses to budge, they come to the conclusion that he's actually very selective about opening up to others and give him the nickname "Exclusivematsu" to mock him. This finally gets him to come clean, where he reveals that he is actually incredibly irritated by having to listen to them discuss such an inane and pointless topic and wishes that they'd stop talking entirely, with the suggestion that this is what he often thinks whenever the brothers are up to their usual shenanigans, and all of this while [[TranquilFury barely raising his voice]]. The other five are understandably taken aback.

** In "The Ichimatsu Incident", Osomatsu walks in on Ichimatsu trying on one of Karamatsu's outfits and Ichimatsu is forced to act like he ''is'' Karamatsu to avoid being ridiculed about it. When the actual Karamatsu finds out about this, he starts pretending to be Ichimatsu so that Osomatsu won't figure out his ruse, and later shoos Osomatsu out of the room to let Ichimatsu escape the situation. Ichimatsu is both awed and [[IrrationalHatred infuriated]] by how thoughtful this is.

** "Karamatsu and Brothers" reveals that Karamatsu is actually extremely timid, and that much of his kind behavior is a result of him being too much of an ExtremeDoormat to be able to say no to another person rather than being an out-and-out NiceGuy.

* ButtMonkey: Mostly during season 1. Even by the standards of [[LoserProtagonist his brothers]], Karamatsu's life is kind of pathetic. None of the girls he tries to woo are charmed by his "cool guy" persona and instead find him creepy, his attempt at trying to cheer Ichimatsu up ended with Ichimatsu about to punch him, and Episode 5 firmly established how unconcerned Karamatsu's brothers (save maybe Choromatsu) were for him after hearing that he was kidnapped. They even leave him out of the group shot at the end of "ESP Kitty", with Karamatsu (very badly injured) looking on in tears.

* HeterosexualLifePartners: Has shades of this with Chibita, who is the only character to consistently express concern for his well being. [[spoiler: They end up becoming roommates after Karamatsu moves out in "The Letter".]]
* ImpossiblyTackyClothes: Granted, the [[HellBentForLeather leather jacket]] and CoolShades aren't that bad (even other Matsunos have had urges of trying it on), but Karamatsu's other casual clothes include a sparkly cyan shirt with ''his own face'' imprinted on it, similarly-sparkly blue pants, and a pair of shiny golden shoes. Karamatsu just seems to be really fond of EverythingsBetterWithSparkles when he's not going for his usual look, much to the embarrassment of his brothers, particularly Todomatsu.

* {{Narcissist}}: He is incredibly self-centered, and tries extremely hard to make himself appear to be a cool, manly guy. Whenever the brothers are lounging around the house (which is often), Karamatsu will likely be inspecting himself with a mirror.

* ShrinkingViolet: He was very shy when he was a high schooler, and used to be the least social of his brothers in high school. He's much more confident as an adult, but he still has shades of this trope, as he is ultimately easily intimidated and an ExtremeDoormat.

* UnlimitedWardrobe: While his brothers usually stick to their default sweatshirts, Karamatsu has quite a few alternate outfits and seems to own a lot of extra apparel, ranging from impossibly tacky stuff like sparkly jeans and a tanktop with his face on it to more ordinary things like coats and cable-knit sweaters.

* CannotTalkToWomen: He tends to get nervous and stuttery around pretty girls. Even his stoic F6 form starts falling apart upon encountering Totoko for the first time.

** Seeing his younger self engage in an even more exagerrated version of his FeigningIntelligence schtick in the movie causes him to lighten up and gain a bit more self-awareness. By the third season, he's comfortable making fun of himself for it, something he'd never do previously.

* {{Hypocrite}}: He ends up being the brother who most wants out of his brothers' {{NEET}} lifestyle, and he knows how pathetic his life is and nags at the others to change theirs, but he participates in their lifestyle wholeheartedly and hasn't done much about his ''own'' situation. [[spoiler:He manages to get over his hypocrisy in "Letter", finally landing a job and motivating the the others sans Osomatsu to follow him.]]

* JourneyToFindOneself: Goes on one after Nyaa shatters his delusions of her in "Just Don't" that leads him around the world. While the episode ends with him [[FriendToAllLivingThings living in tranquility in the forest surrounded by woodland animals]], his follow-up appearance in the "Choromatsu Memorial Hall" segment reveals that [[DramaticallyMissingThePoint all he gained from the experience was an even greater sense of unearned entitlement]].

* {{Narcissist}}: It isn't as pronounced as with Karamatsu or Todomatsu, but Choromatsu clearly thinks very highly of himself as the [[NormalFishInATinyPond most responsible and proper brother]] and is very easily won over by empty flattery relating to his status as such. During moments where he's particularly lacking in self-awareness, he will giddily praise himself for being so much better than his siblings without even a hint of irony.

* NormalFishInATinyPond: Choromatsu would normally come across as a desperate, self-important and painfully-geeky idiot who is all talk and no action to the average observer. Luckily for him, though, his other brothers are all such complete social wrecks that he actually manages to come off as rational and responsible when opposite them.

* {{Otaku}}: He's drawn with dakimakura, is a big fan of an IdolSinger and is mentioned more than once to like anime and video games.
* OutOfFocus: The first episode gives him more screen-time and dialogue than any of the other brothers, including Osomatsu himself, but his role is severely downgraded in the series proper. This is averted in the second cour and especially the second season, where he's given more screen-time and development than he had in the first.

** A subtle example. Choromatsu takes a great amount of pride in being the smartest and most sensible sibling, when in reality his intelligence is mostly limited to pointing out the stupidity of the other five, and he's just as lazy unmotivated as they are. He is called out on this several times.
** In the "Choromatsu Memorial Hall" segment, he founds [[{{Egopolis}} an entire museum dedicated to himself]] that consists of nothing but bragging about his achievements (of which there are so few that he either has to heavily embelish the truth or outright lie) and features an entire wing dedicated to all the success he ''believes'' he will attain in the future due to being [[NormalFishInATinyPond so much smarter and more mature than his brothers are]]. One of the displays features him as a [[AGodAmI god]] shining above his lowly siblings. Todomatsu, who is unwillingly brought on a tour of the museum, is understandably floored by both Choromatsu's ego and his lack of self-awareness.

* SmartPeopleWearGlasses: He dons a pair of glasses during the F6 stunt, and then continues to wear them in professional settings. They seem to part of his FeigningIntelligence schtick, as WordOfGod states that they're [[PurelyAestheticGlasses purely aesthetic]] and don't even have any lenses in them.

** Being treated badly by his brothers can cause him to show an outright furious side. He initially wants to go home after the insulting speech Todomatsu makes towards his siblings in "Todomatsu and the Five Demons", but when he learns the real reason his brother was being mean he was ''absolutely livid'' and attempted to defecate on one of the tables. He's also the brother going towards Totty at the end, being the one implied to beat the crap out of him.
** In general, its noted that Ichimatsu is very dark and criminal like by even the actors themselves, and the end of the year special highlights some of his more malicious moments in the series.

* CoolBigBro: He genunely gets along well with Jyushimatsu, being willing to give him brotherly advice and even be more open about his soft side around him.

* TheEeyore: The most pessimistic and self-critical member of the cast. "ESP Kitty" reveals he mentally convinces himself that he neither needs nor deserve friends and his version of the Type-B "Six Same Faces" single is essentially just him berating himself to whoever is listening.

** When it's his turn to look after the brothers in "We Caught a Cold", he takes advantage of everyone's disoriented state to act out a sado-masochistic roleplay with them. It's only later on that anyone registers how weird the entire situation was.

** In the "Black Santa" sketch, when the couple next to him start acting all lovey-dovey, he gets so upset that he ''literally'' bursts into flames.

* {{Tsundere}}: His character notes describe him as such, even drifting off-topic to tease him about it. The trait gets some limelight in "The Ichimatsu Incident", where he lets out an absolute mood-swing of an inner monologue upon realizing that Karamatsu is trying to save him from his collapsing FawltyTowersPlot.

The fifth born son. He's the energetic goofball of the group and loves to play baseball.

* BitchInSheepsClothing: He may act cute and sweet around women, but he's actually the most conniving of the brothers by far. Case in point, he offered to decline from the custody interview so he could figure out a way to support his parents himself, but that was only because he ''knew'' he'd get on his mother's good side for that speech and pass the interview. "Todomatsu and the Five Demons" cemented this trope even further, with Choromatsu basically calling him two-faced. When the brothers look at each other's internal organs in "Super Detergent", they initially believe that Todomatsu has the most normal set of the six of them, only to realize that he ''has no heart whatsoever''.

* CharacterDevelopment: Season 2 shows Todomatsu handling himself much better in romantic situations than season 1 ever did, with him proactively asking for the phone number of a girl and making good conversation during a mixer. This gets lampshaded during a season 2 sketch, where he has his status as a sextuplet temporarily revoked due to not being ''enough'' of a hopeless virgin.

* {{Flanderization}}: Spin-off materials tend to exagerrate his CampStraight tendencies to WholesomeCrossdresser levels, to the point where there's a high chance that any sort of merchandise involving themed costumes will feature Todomatsu in drag. In contrast, he hardly dresses as a woman any more than the other sextuplets do within the series itself.

* GirlyRun: Many of the opening sequences show him to hold his arms higher up and closer to his chest while running than his brothers do, befitting his status as TheDandy.

* NotSoAboveItAll: The "Star of Hope, Todomatsu" revolves around him going to a mixer and not wanting to bring any of his brothers with him, out of fear that they'll embarrass him by acting weird and antisocial. At the end of the episode, when he attends the mixer with Atsushi, a handsome and successful friend, he's shown acting weird and antisocial, causing him to get completely ignored by the women as a result. This shows that his sociability and charisma are only impressive in comparison to his brothers, and that he's still a cowardly [=NEET=] underneath all of his supposed charm.

* SmugSnake: Pretty clearly thinks of himself as above his brothers, and enjoys passive-aggressively rubbing it in whenever he can, but is just as quick as they are to devolve in to petty patheticness.

* DemotedToExtra: The biggest victim of this. While he didn't do anything particularly major in the original series, he was still a regular presence and one of the more notable supporting characters. In ''-San'', the number of appearances he makes is less than ten. Presumably he's at work most of the time in order to support his family.

* CatchPhrase: He's still got "Sheeeeeh!" going for him. In fact, by his own self admission, that's barely all he has ''left'' going for him.

* {{Foil}}: To the sextuplets. While all of the brothers, even Osomatsu, show some degree of guilt and anxiety over their inability to grow up and become functioning members of society, Iyami would rather become homeless than have to work hard for a living, and doesn't show even an ounce of shame for doing so. On the flipside, the season 3 opener shows that he's perfectly willing to give up everything that makes his comedic identity unique for the sake of money while the sextuplets aren't (though mostly because they ''can't'').

* InferioritySuperiorityComplex: Acts haughty and arrogant but is all too painfully aware that he's become a washed up nobody. When forced to confront the reality of his situation, he becomes so depressed that he tries to kill himself.

* PerpetualPoverty: He's always struggling to get by, since he's too lazy to work a regular job and his schemes almost always fail.

* {{Schemer}}: Iyami still regularly engages in get-rich-quick schemes, and even occasionally manages to get his old partner in crime Chibita out of retirement to help him with them.

* WhiteDwarfStarlet: Is this in a meta sense. By "Iyami's Great Discovery", he can't convince a temp agency that he was a famed comedian during the 60's and 80's, and by "Iyami's Counterattack" he outright tries to murder the rest of the cast in order to take back his fame.

* AttractiveBentGender: When Iyami convinces him to join in on the rental girlfriend gig, Chibita doesn't actually look too bad in girl's clothing. But when Dekapan gives him a gender bending drug, his female form is this, with bigger eyes, a cuter figure, and twintails.
* TheBartender: Plays this role despite owning an oden stall instead of a bar (though he does serve alcohol along with oden). When he's not scolding the sextuplets for not paying their tab, he's handing out aggressive but well-meaning advice; "Chibita and Oden" establishes that he's genuinely concerned about [[ManChild where their lives are headed]].

* InterspeciesRomance: A brief one with a flower sprite, who played the part of a ManicPixieDreamGirl to stop him from obsessing about oden. [[MythologyGag The basic premise of this happened in]] ''[[MythologyGag -Kun]]'', too.

** Anything involving [[TrademarkFavoriteFood oden]]. In "Chibita and Oden", he tells Karamatsu about the importance of oden throughout the years and how to make what he called "the best oden in the world".

* TokenGoodTeammate: While the sextuplets, Totoko and Iyami are all varying degrees of [[{{Jerkass}} Jerkasses]] and Hatabou, Dekapan and Dayon are prone to being [[BitchInSheepsClothing Bitches in Sheeps Clothing]], Chibita is consistently portrayed as a reliable, friendly guy.

* AttentionWhore: She really seems to like when all the focus is on her. Case in point, her idol stunt was just so she could brag about her popularity to everyone.

* CloudCuckoolander: She can be pretty strange at times. She thought it was a good idea to use ''actual fish'' as the headpiece for her idol costume and keeps a teddy bear with a knife sticking out of it in the corner of her room.

* FaceOfAnAngelMindOfADemon: She's genuinely very cute, but that's the ''only'' positive quality she has going for her. Otherwise, she's a shallow, violent, and emotionally-stunted narcissist who demands that others treat her like royalty simply for being alive. It's even acknowledged in-universe when she has her personal qualities statistically evaluated by the Matsunos' robots in "Estimated Value": scoring a 96 out of 100 for her looks, a 2 out of 100 for her talents as an idol, and a [[BrokeTheRatingScale Shit]] out of 100 for her personality.

* SmallNameBigEgo: Believes that she is above "commoners" and deserves to be treated like a queen despite being the daughter of fish mongers and having no skills beyond being cute, which "Totoko's Huge Panic" highlights won't last much longer now that she's a grown woman.

Once a childhood acquaintance of the Matsuno brothers and occasional minion of other characters, Hatabou appears to not have aged at all. However, he's surprisingly good at making money.

* DependingOnTheWriter: While the first season consistently portrayed him as being fabulously (and improbably) wealthy and successful, the second season tends to flip flop between him retaining his success and him being just as down on his luck as the rest of the cast.

* HumanoidAbomination: CharacterExaggeration has made him into one. Apparently he has an entire civilization of people who look similar to him living inside of his stomach and thousands of clones of him are ''built'' every day in the Black Factory. Almost all of the opening sequences feature a titanic version of him for seemingly no reason other than creepiness.

* CharacterizationMarchesOn: Much like Todomatsu before her, Nyaa's character has largely become defined by her [[BitchInSheepsClothing two-faced]] personality and [[AlwaysSomeoneBetter love for smugly one-upping]] [[TheRival Totoko]], despite both traits only being revealed during her final major appearance in season 1. Considering that she essentially had no character besides "cat-themed idol that Choromatsu likes" at first, [[Administrivia/TropesAreTools it's actually fleshed her character out a lot]]. She receives further characterization in Season 3, making her the biggest example of an AscendedExtra in the series.

** When Choromatsu [[spoiler:pleads her ''not'' to pursue [[{{Jerkass}} his trash eldest brother]]]], she accuses him of addressing her as "Nyaa-chan" despite "having never known him before". [[spoiler:This breaks Choromatsu's heart so much that he embarks a self-discovery world tour and has to overcome his PTSD towards cats for the rest of the episode]].

* StraightMan: After she and Totoko becomes [[VitriolicBestBuds friends]], the majority of the segments that feature them as a duo emphasize Nyaa's maturity and common sense compared to Totoko. [[spoiler: This is notably inverted in the episode "Just Don't", where ''Nyaa'' is presented as the unreasonable one for refusing to listen to Totoko's very legitimate protestations about her crush on Osomatsu.]]

* HiddenDepths: They show a fascination with the conventions of gag comedy early on during their time serving as the Matsuno's personal AIs, and decide to pursue a career in comedy almost immediately after they develop free wills of their own. They rise in the comedy world very quickly, and manage to compete in a national comedy grand prix within the first year of their career.

* TagalongKid: Often accompany the Matsunos wherever they go.

* SatelliteCharacter / ThoseTwoGuys: They almost always appear together, and they rarely interact with characters other than Todomatsu (despite the irony of their debut ''not'' interacting with him, but Karamatsu.). Aida has made two appearances without Sachiko, but remains a Satellite Character to Todomatsu during the first and serves as a Satellite Character to Atsushi (''another'' character generally portrayed as a satellite to Todomatsu) in the second.

* {{Telepathy}}: All versions of the cat could read the thoughts of people as they speak to it, and it repeats what they were thinking right afterwards.

* DistaffCounterpart: While it was already common for fans to [[RuleSixtyThree think of excuses to draw the Matsuno siblings as girls]], the production decides to make strikingly similar looking female counterparts to the sextuplets care of episode 13. The end result is an entirely new set of characters whose appearances and interpersonal dynamics are totally different (to the point WordOfGod says they aren't even siblings), yet similar ''enough'' to the Matsuno brothers.

* ChickMagnet: All of the women at the mixer he and Todomatsu attend show interest in him.

* DrearyHalfLiddedEyes: He is drawn with half lidded eyes which reflects his charming and flirtatious personality.

* HesAllGrownUp: TheMovie reveals that he was chubby and had shabby hair during his senior year of high school, whereas he's suave and well-dressed as an adult. Downplayed as he still seemed to have a fairly active social life even back than, albeit not to the extent of his ChickMagnet future self.

* {{Salaryman}}: While he is based off of the Matsuno brothers and is just as much as a loser as them, Sanematsu actually has a job--but unfortunately he's a middle management pencil pusher in an office building.

* TheBusCameBack: [[spoiler: She leaves town at the end of her debut episode but is still part of the ContinuityCavalcade in the second cour finale, attending Coachmatsu's funeral and later showing up in a baseball uniform with "Jyushi" written on it.]] She makes a proper reappearance in the segment "Jyushimatsu and the Dolphins", though it's unclear if the events that occur during it are set in the same continuity as in her first appearance.

* GoldAndWhiteAreDivine: A manifestation pure goodness who wears white and has gold eyes.

* DidWeJustHaveTeaWithCthulhu: Despite being MadeOfEvil, he considers the sexuplets his siblings and allows himself to be reabsorbed into their bodies once Godmatsu is defeated, even adding that they're free to summon him whenever they want.

* BadassArmfold: Exclusively seen in this pose throughout his very limited screentime.

* CoolLoser: With the possible exception of [[YaoiFangirl Choroko]], the Girly-matsus are much more socially well-adjusted and fashionable than the Matsuno brothers are, yet none of them appear to have any luck getting dates.