Here's a list of characters and related tropes for the manga series {{Yotsuba}}.
[[folder: The Koiwai Family]]
!! Yotsuba Koiwai

Our viewpoint character, a five-year-old with a very energetic outlook on the world.
* AdorablyPrecociousChild: Ziggzagged. There are times when she acts exactly like you would think a five year-old would act, then there are times she does or says things that you would expect from someone older. Though the things she says are sometimes played with as well since there are times it's obvious she's just repeating what she heard with no idea as to the meaning.
* BadLiar: Not that she's noticeably worse than any other five-year-old. Props, though, for trying to use AWizardDidIt.
* CheerfulChild: As it [[OncePerEpisode says in every chapter]], "Today is always the most enjoyable day."
* CloudCuckoolander: Her dad thinks she's a little weird. When describing her to Fuuka, he says:
--> '''Koiwai:''' If you see a girl that makes you think "It's a weirdo", it's probably her.
* ComicallyMissingThePoint: She does this a few times. For example, because she doesn't understand why Jumbo asks her to invite Asagi along for things, she tends to fail and invite others instead.
%%* ConstantlyCurious
* CurtainsMatchTheWindow: In addition to her green hair, Yotsuba also has green eyes.
* {{Determinator}}:
** Yotsuba ''will'' deliver Fuuka her milk, even if she hasn't a clue where Fuuka's school is, or even ''what'' a school is. Because a milkman ''[[SeriousBusiness delivers]]''.
** Also, when told to return home alive from "exacting revenge" she replied: "Even if I die I'll come home alive." [[ItMakesSenseInContext And she did.]] ''That's'' determination.
* ExpressiveHair: Her pigtails rise and fall with her (rapidly changing) moods.
* GenkiGirl: In spades. ''And'' the trump suit. This gets {{Lampshaded}} by Asagi: "Her default rate of movement really is running."
* HappilyAdopted: She doesn't care one bit about her parentage. Koiwai is "dad" and that's that.
* HateAtFirstSight: Yanda tried to enter the house while her dad was away. Yotsuba was taught not to let any strangers in when she's alone. Which leads to her slamming the door on his face. The fact that Yanda enjoys making her angry on purpose doesn't help improve her opinion of him.
* ImprobableHairstyle: Obeying the RuleOfCute, Yotsuba's hair is ''always'' in those four little pigtails, even when sleeping, swimming, [[FuroScene taking a bath]], etc.
* IntergenerationalFriendship: Other than the recently named Mii-chan, Yotsuba doesn't have many friends her own age, with Ena and Miura being the closest in age at ten. Justified because she just moved to town and isn't in school yet.
* {{Malaproper}}: She mostly knows the words, but how to say them is still a little beyond her.
* MeaningfulName: It means "four leaves" as in "four-leaf clover". Thus her hair.
** "Yotsuba" and "Koiwai" are also both brands of dairy products in Japan, and a whole chapter is centered around drinking milk.
* MistakenNationality: Based on her appearance, strangers constantly assume Yotsuba to be a foreigner, and indeed she was born in another, unknown country. As a result, some students at Fuuka's school try to speak to her in English because [[PhenotypeStereotype all gaijin are American]].
* ParentalAbandonment: We know nothing about her origins except that Koiwai found her somewhere overseas, which Yotsuba claims was "an island 'to the left'".
* PluckyGirl: Delivering milk is SeriousBusiness.
* SitcomArchNemesis: Hers is Yanda.
* SunnySunflowerDisposition: She's such a GenkiGirl, she appears with a bouquet of sunflowers in the cover of the 1st volume. A later chapter even sees her fascinated by sunflowers in Jumbo's shop, and wanting to buy some.
* SuperDrowningSkills: Suprisingly averted, Yotsuba can swim quite well. Koiwai, Jumbo and Fuuka on the other hand...
* SweetDreamsFuel: Her very existence.
* ThirdPersonPerson: Childishly, in the original Japanese (mimicked in the Yen Press translations); she combines this with an innocent imitation of her father's masculine language -- the effect is hysterically funny but is, alas, LostInTranslation.
* TrademarkFavoriteFood: As expected for a five-year-old, Yotsuba really likes ice cream. She also has a fascination for cup ramen. Curry is another favorite -- one of the songs on the [[ImageSong Image Album]] is called "Eating Curry (Very Delicious)".
* {{Twintails}}: Technically, ''quad''-tails.
* [[WhyDidItHaveToBeSnakes Why Did It Have To Be Eyeballs?]]: Yotsuba is terrified of anything that has huge eyes, or anything that looks like a huge eye. Ironic considering her own are pretty big.
* [[YouGottaHaveBlueHair You Gotta Have Green Hair]]: Which makes her an oddity among the cast's otherwise realistic character designs.

!! Mr. Koiwai / "Dad"

Yotsuba's adoptive father, who works from home as a translator. He's devoted to her, but isn't exactly the most driven parent who ever lived.
* {{Catchphrase}}:
--> '''Koiwai: Important announcement!'''
* ChildrenRaiseYou: Koiwai calls himself "irresponsible," but he all but admits that raising Yotsuba has forced him to get his act together, at least a little.
* CutenessProximity: Put a guinea pig in his vicinity and he just melts. It's been suggested this may be part of the reason he adopted Yotsuba.
* DeadpanSnarker: Usually when bulling around with Yanda, but sometimes in response to Yotsuba.
--> '''Koiwai:''' It says "No admittance."
--> '''Yotsuba:''' Even for me?
--> '''Koiwai:''' What, are you a VIP?
* [[GoodParents Good Dad]]: So very much.
* {{Hypocrite}}: Despite his anger over Yotsuba lying to him, he himself frequently lies to her, though they are small white lies or pranks.
* OneOfTheKids: He frequently behaves in a childishly over-the-top manner when interacting with Yotsuba, but otherwise he's a normal (if slightly irresponsible) adult.
* ReasonableAuthorityFigure: He's quite willing to tolerate, if not participate in, Yotsuba's sillier antics. On those occasions when she ''does'' actively misbehave, the hammer comes down hard -- sometimes overlapping with ScareEmStraight.
* SuperDrowningSkills: He, along with Jumbo and Fuuka cannot swim, and will immediately drown when pushed into deep water.
* TheSlacker: He doesn't even wear ''pants'' in the summer, if he has the choice.
* UnnamedParent: We have never learned his given name. Even Jumbo calls him by his family name.

[[folder: The Ayase Family]]
The Koiwai's next-door neighbors, frequently visited by Yotsuba.

!! Asagi Ayase

The oldest Ayase girl; Yotsuba looks up to her (figuratively ''and'' literally). She seems to enjoy it.
* AlliterativeName: '''A'''sagi '''A'''yase.
* BadAss: Hey, she WAS the only one to disarm the revenge-fueled water-gun toting Yotsuba. She even blasted Yotsuba right back! Nobody else is that badass.
* CoolBigSis: Yotsuba admires her very much, and likes clinging to her more than she does her sisters.
* CutenessProximity: She gets this every so often around Yotsuba.
* DudeMagnet: Not that she notices, but Jumbo and Yanda both fall hard for her.
* TheGadfly: Likes pulling pranks on people, or using Yotsuba to pull pranks on people.
* HiddenDepths: She is actually really good at fixing Teddy Bears, even ones with an electrical voice box that had been soaked in water.
%%* [[LikeFatherLikeSon Like Mother, Like Daughter]]: Though both will strenuously deny this.
%%* LongHairIsFeminine: Her hair hangs below her waist.
* OneOfTheKids: She is able to follow along with Yotsuba's train of thought better than anyone else.
* RomanticTwoGirlFriendship: Asagi and Torako do pretty much everything together, including going on long trips. Yotsuba's description of the two's relationship sounds like they are girlfriend and boyfriend.
* SweetTooth: She gets it from her mother. They sometimes clash over it.
%%* TomboyAndGirlyGirl: Girly Girl to Torako's Tomboy.
%%* TricksterMentor: To Yotsuba.
* {{Troll}}: Yotsuba spends a whole day excitedly waiting for Asagi to bring her a gift, but upon returning from her trip Asagi pretends to have no idea what she's talking about. It's not until Yotsuba is dejectedly walking away that she pulls out a bag of fireworks.
* TheUnfavorite: She and her mother do not exactly get along, played mostly for laughs.

!! Fuuka Ayase

The middle Ayase girl, and the one who seems to have the worst luck. Her travails, of course, go right over Yotsuba's head.
* BerserkButton: Don't call her fat or mention her weight. Just don't. Jumbo (and Koiwai) found out the hard way in the pool chapter.
* BigOlEyebrows: Though Koiwai in chapter 67 thinks this just makes her cuter.
* ButtMonkey: She frequently takes the brunt of Yotsuba's BrutalHonesty and Jumbo and Koiwai's teasings. She also seems to have terrible luck. Some examples:
** She got stuck in the Koiwais' bathroom window when they first moved in.
** She woke up late when Yotsuba came to bring milk to her family, and missed the good stuff.
** Her crush got together with another girl, and Yotsuba's attempt to cheer her up makes things worse.
* DreadfulMusician: Fuuka, ''drop that ukelele''. And stop singing.
* FriendToAllChildren: Especially prevalent during the Autumn festival.
* GenerationXerox: Takes after Mr. Ayase, notably his romanticism and love of puns (much to Asagi's chagrin).
%%* GirlNextDoor
* GoNagaiSideburns: Her hair seems to give this sort of visual effect, kinda like [[Manga/AzumangaDaioh Kagura]].
* IncrediblyLamePun: Her sense of humor leaves much to be desired.
* IsThatCuteKidYours: Apparently Fuuka's classmates wondered if Yotsuba was her child.
%%* {{Joshikousei}}
* MsFanservice: Shows off a lot more skin than any other female character, including wearing short skirts, swimsuits and turning up in sexy outfits on colour pages.
* PungeonMaster: Of the incredibly lame variety. Her father enjoys them, but Asagi and Jumbo don't.
* ShipTease: Usually with Koiwai, PlayedForLaughs.

!! Ena Ayase

The youngest Ayase girl, she's the closest to Yotsuba in age and thus plays with her most often. Likes bugs, amphibians, and teddy bears.
* AdorablyPrecociousChild: Mature for her age, especially when compared to her sisters and mother.
* BerserkButton: Don't do anything that ''isn't'' environmentally friendly, or keep calling any of her bears Duralumin.
* CheerfulChild: Although not quite at Yotsuba's level, Ena still generally has a sunny disposition.
* CoolBigSis: The younger variety; Ena seems to go further than Fuuka or Asagi in treating Yotsuba as a little sister.
* DaddysGirl: Though Mr. Ayase loves all of them very much, Ena seems to be his little girl.
* EncyclopaedicKnowledge: She has a lot of random knowledge about a great many things.
* GirlsLoveStuffedAnimals: She likes playing with her teddy bears with Yotsuba.
* GranolaGirl: She tends to be more environmentally conscious than others as well as having a fondness for recycling, but she doesn't mind eating meat or helping clean fish for a meal.
* HiddenDepths: She really likes experiencing new things, even if it may be unpleasant like cleaning and gutting fish.
* NatureLover: She really likes the outdoors.
* TomboyAndGirlyGirl: She looks like the girly girl to Miura in terms of looks and general personality, but has some tomboy interests.

!! Mrs. Ayase

The mother of the three girls.
* AbusiveParents: PlayedForLaughs in her treatment of Asagi.
%%* HappilyMarried
* {{Housewife}}: She's always seen inside her house, usually preparing food in the kitchen or doing laundry.
* [[LikeFatherLikeSon Like Mother Like Daughter]][=/=]GenerationXerox: She and Asagi are quite alike, but don't tell either that.
* SweetTooth: She seems to be fond of foods like ice cream and cake.
* UnnamedParent: Her given name has not been revealed so far.
* [[WhyDidItHaveToBeSnakes Why Did It Have To Be Cicadas]]: She looks visibly terrified when Yotsuba releases a bunch of cicadas in the house.

!! Mr. Ayase

The father of the three girls.
%%* HappilyMarried
* ParentalAbandonment: He's rarely at home because of his work, and Asagi frequently pretends he's already dead because of it. PlayedForLaughs, though.
* SalaryMan: The reason he's rarely at home.
* SatelliteCharacter: Does not have much characterization aside from being the girls' father. He's only appeared in one or two chapters, and has very few lines when he does appear.
* UnnamedParent: Like his wife, his given name is completely unknown.

[[folder: Friends]]
!! Takashi "Jumbo" Takeda

Koiwai's best friend, whose nickname hints at his most notable feature. A decent guy, if a little overenthusiastic around Asagi.
* AchillesHeel: Miura is able to manipulate him by saying she'll mention how good or bad a person he is to Asagi.
* AlliterativeName: His real name.
* TheBigGuy: He is enormous, both in height and in breadth.
* BigOlEyebrows: Just like the rest of him.
* ChildhoodFriends: Implied with Koiwai. In the stargazing chapter, he mentions that he's taking them to a field that he and Koiwai went on a field trip to when they were children. Also, he's probably the closest friend Koiwai has. Yotsuba seems to think that he's his ''only'' friend, as stated in Yanda's introductory chapter.
* FailureIsTheOnlyOption: Anytime he tries to get Yotsuba to invite Asagi on an outing.
* FriendToAllChildren: Helps that he is practically a child in mentality himself.
* GentleGiant: He's a [[RealMenWearPink florist]].
* HopelessSuitor: Has a large crush on Asagi.
* HotBlooded: Moreso than others; he shares it with his dad.
* JackOfAllTrades: He is pretty knowledgeable in a lot of areas
* OneOfTheKids: Gets into a rivalry with a ten-year-old girl over going to Hawaii.
* OnlyKnownByTheirNickname: Jumbo, referring to his terrific size.
* PhraseCatcher: ''"You're huge!"''
* SheIsNotMyGirlfriend: He corrects his dad after he assumed Fuuka was his new girlfriend.
* SitcomArchNemesis: Seems to be actually ''trying'' to be this with Miura.
* UnrequitedLove: He has fallen for Asagi pretty hard, but he can barely talk to her, let alone ask her out.
* WhatTheHellHero: Koiwai calls him out on using Yotsuba to try and ask Asagi out, though this fails every time.

!! Miura Hayasaka

Ena's friend, who's not all that nice to Yotsuba (though she doesn't actively try to be mean; she just doesn't have everyone else's patience). ''Hates'' slimy things, in contrast to Ena.
* {{Bifauxnen}}: She has short hair and wears boyish clothes. When Jumbo first met her, he had to ask if she was a girl or a boy.
* BrutalHonesty: She tends not to keep her opinions to herself, and once pointed out that Yotsuba's drawing is terrible, almost driving her to tears.
* CoolToy: She keeps amazing Yotsuba with various things, such as Heelies, a unicycle and a push scooter.
%%* DeadpanSnarker: On occasion.
* JerkWithAHeartOfGold: Miura has a tendency to play mean pranks on Yotsuba (e.g. appearing before the latter in an eyeball mask after discovering that Yotsuba is afraid of eyeballs), but despite this, she is good friends with Yotsuba and Ena.
* LovableCoward: She is easily frightened, and cannot stand bugs, snakes, frogs or anything slimy.
* {{Miko}}: Was dressed for the part during the Autumn Festival.
%%* SheCleansUpNicely: Pulls this off as one of the matsuri maidens during the autumn festival.
* {{Shorttank}}: She prefers sports clothing to tanktops, though.
* SitcomArchNemesis: Jumbo tries to be this with her, though she only sometimes takes the bait.
* StrongFamilyResemblance: Miura looks a lot like her mother, and upon meeting both of them many characters have commented on it.
* TomboyAndGirlyGirl: She looks like the tomboy, but Ena is actually more tomboyish than her.
* TomboyWithAGirlyStreak: She's a mischievous tomboy, but has some girly girl interests, is surprisingly squeamish and has a distaste for anything slimy and gross.

!! Torako

Asagi's friend, she has a somewhat more aloof personality. Yotsuba seems to confuse her even more than the rest of the cast.
* AloofDarkHairedGirl: Part of the reason Yotsuba thinks she's cool.
* {{Bifauxnen}}: She's rather androgynous.
* BoyishShortHair: She has short hair and lacks any girlish traits.
* CoolBigSis: Yotsuba thinks she's cool at first sight, later in the series Torako actually teaches Yotsuba how to tie bow knots.
%%* DeadpanSnarker: Sometimes.
* DefrostingIceQueen: She initially acts cold towards Yotsuba, since she's not used to kids, but is beginning to open up to her antics.
* EveryGirlIsCuterWithHairDecs: Yotsuba ties one in Torako's hair after Tora taught her how; Asagi and fans all agree that it was really cute.
* InSeriesNickname: Since her name looks like "Tiger Child" when written out, Yotsuba calls her Tora/Tiger.
* NoSocialSkills: Nothing all that serious, but she often proclaims not to be good with kids. Not that this keeps Yotsuba from liking her.
* PerpetualFrowner: The only expression outside of [[BlueWithShock shock]] she shows.
* RomanticTwoGirlFriendship: With Asagi; when Yotsuba explains their relationship to Jumbo it sounds like they are boyfriend and girlfriend.
* SmokingIsCool: Or so Yotsuba thinks.
* TheStoic: Though she'll show emotion when the situation calls for it (like Yotsuba setting off sparklers on her car).
* TomboyAndGirlyGirl: Tomboy to Asagi's Girly Girl. The punchline of chapter 77 specifically plays off this dynamic.
* UnknownRival: Jumbo thinks [[GenderBlenderName "Tora"]] is Asagi's boyfriend thanks to a rather unclear description of her and her relationship with Asagi from Yotsuba.

!! "Yanda" Yasuda

Koiwai's kohai who gets a kick out of taunting Yotsuba. Unfortunately for him, everyone treats him ''exactly'' like he deserves.
* ChekhovsGunman: He's mentioned fairly early in the very first chapter and receives a handful of mentions afterward, but doesn't appear in person until chapter 30.
%%* ButtMonkey: He brings it upon himself.
* DropInCharacter: Frequently visits the Koiwais so he can mooch hot water for his instant ramen.
* {{Jerkass}}: Yotsuba certainly sees him as one, because he not only stole her ice-cream, he took back the candy he gave to her, and wouldn't stop mocking her.
* KickTheDog: He initially went out of his way to be mean to Yotsuba, though he seems to be [[JerkWithAHeartOfGold getting better]].
* OneOfTheKids: This guy ''enjoys'' being Yotsuba's SitcomArchNemesis.
* OnlyKnownByTheirNickname: His real last name is Yasuda, but no one calls him that. His given name is completely unknown.
* PerpetualPoverty: He barely even has money to eat well (living on a diet of mostly instant ramen), at least until the end of the month.
* PetTheDog: While not as bad a guy as Yotsuba makes him out to be, he seems to enjoy messing with her a little to much. That said he is also the one who gets her out of her funk when she's worried about Duralumin, and shows her the awesomeness of bubbles.
* {{Salaryman}}: White shirt, tie and all.
* SempaiKohai: He is said to be Koiwai's old kouhai. Probably worked with him at one point, or maybe when they were at school.
* SitcomArchNemesis: Of Yotsuba. He even seems to take delight in invoking the trope in regards to her.
* StraightMan: Thinks the way that Koiwai and Jumbo go along with Yotsuba's antics is incredibly weird. However he's NotSoAboveItAll at times.
* TookALevelInKindness: Starts behaving nicer to Yotsuba in chapter 72.
-->'''Yotsuba:''' Yanda, you're being nice today. Keep up the good work.
* TrademarkFavoriteFood: He practically lives off instant ramen.
* TsurimeEyes

!!Miss Stake/Shimau A classmate and friend of Fuuka's. Her real name is Hiwatari, but acquired her nickname when flubbing her introduction to her class.

* HappyDance: Done by Shimau, Fuuka and Yotsuba while baking a cake.
* LostInTranslation: The joke behind her nickname.
* NiceHat: Wears a Chef's Hat when baking a cake, which Yotsuba praises her for.
* OnlyKnownByTheirNickname: Her name's Hiwatari, but everyone calls her Shimau/Miss Stake.
* SatelliteCharacter: Satellite to Fuuka. She also only appears in a few stories.