History Characters / BGataHKei

* ThisLoserIsYou: From his point of view the plot is a classical loser story to such a degree that the audience must identify with him. He also represents the average viewer who can't stand up for himself and what he believes in and just happens to be lucky or unlucky to be chased by Yamada. One of his worst moments is when he meets Keiichi together with Yamada while Keiichi confesses to her while they are dating and some other girls in the bar point out how pathetic he is.

* UnluckyEverydude: He is plain-looking, self-doubting, afraid of heights, has a hobby that is considered boring by most and does not have many friends. If meeting Yamada is good or bad for him is up for debate.

One of Kosuda's classmates and the closest Kosuda has as a friend (besides Daisuke, who he doesn't see very often), although he's not very helpful.

Matsuo is Takeshita's boyfriend but she misses him very much and [[spoiler:even gets jealous at times]], as he goes to the nearby college.

He's a [[OtokonokoGenre very feminine boy]] who does not appear until very late in the manga (''chapter 244''). He shows up at one of Akimoto's parties, where Misato immediately falls for him.

* SawItInAMovieOnce: Yamada's ideas of running around without panties and taking Kosuda to the alleged "secret room" in the Keiichi mansion come from Misato who claims that she learned these tricks from girl's magazines and mangas.

-->''"Actually it's all a dream an in reality I have a lot of experience."''

[[quoteright:280:http://static.tvtropes.org/pmwiki/pub/images/gods_of_sex.jpg]]

* [[SharpDressedMan Sharp Dressed Woman]]: Ero minus wears a business suit, a black tie and glasses and also seems to hold some kind of files under her arm.

[[caption-width-right:350:]]

[[folder:Yamada's Sex God]]

->'''Yamada's Sex Goddess''': ''"I'm a God of Sex, it's all good."''

[[caption-width-right:200:Yamada's Sex God]]
She appears to be an older and rather deformed version of Yamada with a mustache. Her role in the anime is much bigger and she takes the part of the narrator too. She seems to care about Yamada a lot and while Yamada is skeptical about her at first, she accepts her as her guide after she appeared in Yamada's dream.

[[folder:Kosuda's Sex God]]

->'''Kosuda's Sex God''': ''"Only to masturbate and go to bed."''

[[caption-width-right:200:Kosuda's Sex God]]
Kosuda's Sex God wears a bathrobe and is very lazy and unhelpful, and mostly just appears when Kosuda gets an erection and crackles a laugh.

[[caption-width-right:184:"ero plus" (right) and "ero minus" (left)]]

->'''Yamada''': ''"Our relationship is progressing, but their are more and more things, which I can't seem to understand! Why!?"''

* LastEpisodeNewCharacter: He does not make an appearance until ''chapter 296" (out of 300) in the manga.

-->'''Yamada's Sex Goddess:''' [looks surprised] ''"Have you always been there?"''

-->'''Takeshita:''' What the hell is wrong with you? You're wearing a skirt!

** At one point she shouts ''"they'' [Yamada and Kosuda] ''should fuck already"''. Her boyfriend is completely in shock.

* InvisibleParents: Most of the time in the manga, always in the anime.

He's a [[OtokonokoGenre very feminine boy]] who does not appear until very late in the manga (''chapter 245''). He shows up at one of Akimoto's parties, where Misato immediately falls for him.

A list of character tropes that happen in ''[[Manga/BGataHKei B Gata H Kei]]'' manga/animé.

!Takizawa High School

* AccidentalPublicConfession: Kosuda accidentally confesses to Yamada in front of the whole class in ''episode 9'' while voting for a popularity contest between Yamada and Kyouka. He gets immediately turned down and laughed at by his so-called friends.

* SourOutsideSadInside: [[spoiler:She is very deadpan when it comes to Yamada, but (in the manga) we learn that she's sexually frustrated and misses his boyfriend very much).]]

Matsuo is Takeshita's boyfriend but she misses him very much and even gets jealous at times, as he goes to the nearby college.

[[caption-width-right:200:Yamada]]

* TitleDrop: Kosuda wears a sweater in the manga that says "B-Type H-System". He also sings the theme song in ""episode 12'', where the title appears.

** Kyouka's is a stereotypical European noblewoman, complete with fan and PimpedOutDress.

* DivineRanks: The can rank up or rank down depending on how much sex their hist has.

* AccidentallyAccurate: One one point when Kosuda asks him for advice in regards of Yamada, he says "just push her down and say [[DoYouWantToCopulate let me fuck you]]". He doesn't seem to know that this might indeed by a successful strategy with Yamada. Kosuda freaks out.

* AcceptableFeminineGoalsAndTraits: Ero minus keeps lecturing about these. She believes in responsibility and love are the foundations of sex and there is no need in rushing.

* HeroicBSOD: [[spoiler:Ero minus goes through a heavy one when she says that she has time with Takeshita's mission to have sex and ero plus showing her the reality (Takeshita already doing it wildly).]]

* InTouchWithHisFeminineSide: He looks very feminine and likes things like hair ribbons.

** Uniquely, Takeshita has ''two'': One ("ero minus") is dressed as a businesswoman and takes relationships very seriously, giving the sort of advice that Takeshita gives to Yamada. The other one ("ero plus"), however, is a complete maneater and represents a rather suppressed trait of Takeshita's personality. They are fighting most of the time and it seems that [[spoiler:"ero plus" is winning]].

** Akai-sensei's is a high school girl, reason being that she never got a chance to mature since Akai was always busy with work.

** Katase's is a lonely, mature, incredibly beautiful and mysterious woman and by far the most beautiful of the eros deities. She firmly believes that Katase wants a boyfriend despite her obvious hatred of men.

* BeAsUnhelpfulAsPossible: He is completely useless and never gives out any useful advice. Kosuda even complains about this once in the manga. However, Kosuda's sex god still seems to be benevolent.

[[folder:Spoiler Character (Warning!)]]
->'''Yamada''': ''"Our relationship is progressing, but their are more and more things, which I can't seem to understand! Why!?"''
->'''Yamada's God of Love''': ''"This is love."''
-->-- In ''chapter 296'' of the manga

As a complete surprise to everyone (even to Yamada's sex goddess), Yamada is the only character in the manga with a god of love. Probably she was hiding very well. She doesn't appear until ''chapter 296'' in the manga and only in one panel. She looks like an angelic version of Yamada with around 20.

* AngelicBeauty: She looks like an angel, with wings, a gloriole, a white dress and a stick with a heart. Also she smiles in contrast to Yamada's sex goddess.
* LastEpisodeNewCharacter: He does not make an appearance until ''chapter 296" (out of 300) in the manga.
* SchrodingersGun: Although Yamada is victim to WhatIsThisThingYouCallLove and only the eros deities are shown in heaven, it's never explicitly stated that Yamada does '''not''' have a god of love. Even Yamada's sex goddess is taken by surprise.
-->'''Yamada's Sex Goddess:''' [looks surprised] ''"Have you always been there?"''
* ShoutOut: She has a stick with a heart (which is probably a magic wand), just like the Queen of Hearts in the Disney adaption of [[Disney/AliceInWonderland Alice in Wonderland]].
* SmallRoleBigImpact: She only appears once but obviously has lots of influence on Yamada's later love life.
* WalkingSpoiler: It's completely impossible to talk about her at all without spoilering that a) love deities exist too and b) Yamada (of all people) has one.

!Other Characters

[[folder:Kanejou Keiichi]]

[[quoteright:200:http://static.tvtropes.org/pmwiki/pub/images/keiichi.jpg]]
[[caption-width-right:200:Kanejou Keiichi]]
He is Kyouka's brother and primary target of her sexuality. He's a student at Harvard Business School and is very popular and handsome. When he returns to Japan to visit his sister, he wants Yamada to become his girlfriend, to his sisters dismay. Misato has huge interest in him.

* TheAce: He is super good at everything he does. He goes to the best university and has a huge career in his later life. Everybody admires him besides Yamada.
* AnimeHair: He has the most anime-like hair of all characters and an unnatural hair color.
* BishieSparkle: Just like his sister to underline his handsomeness, he's always surrounded by it.
* ChickMagnet: Keiichi is super-handsome and women are constantly throwing themselves at him. He could very well be TheCasanova but he chooses not to [[spoiler:partially because he's in no rush to have sex, if he can get it anytime he wants and even surprises everyone when he says that he's still a virgin.]] He falls for Yamada ''because'' she's disinterested.
* NoChallengeEqualsNoSatisfaction: Although many women love him he's not very much interested in them because they are too easy to have. Yamada is the first girl to not instantly fall for him so he goes for her.
* [[spoiler:UnexpectedVirgin]]: When he confesses to Yamada while she's on a date with Kosuda, she turns him down [[spoiler:because she believes that he's not a virgin. To Yamada's and everybody else's surprise, he admits that he is indeed a virgin, mainly because he could have it every day and this turns him off]].
* YouGottaHaveBlueHair: He has magenta hair, just like his sister.

[[folder:Kosuda Kazuki]]

[[quoteright:200:http://static.tvtropes.org/pmwiki/pub/images/kazuki_7.jpg]]
[[caption-width-right:200:Kosuda Kazuki]]
Kazuki is Kosuda's big sister. She's a college student still living with his brother and more out-going than him. She helps him with planning his dates.

* BikerBabe: She wears a biker outfit very often, when she's outside.
* {{Bokukko}}: She refers to herself with male Japanese pronouns.
* CoolBigSis: She is very happy when Kosuda brings Yamada to his home and goes away for two hours. She also gives him dating plans and even sex tips, although she's upset at first when he asks her for it.
* OneOfTheBoys: She was already very tomboyish and Miyano's "prince" when she was younger and for some reason the reason why Miyao fell in love with Kosuda.
* ShamelessFanserviceGirl: Both in-universe and out of it. She runs around naked very often in the house, much to Kosuda's anger.
* SiblingYinYang: She is much more self-confident and outgoing than Kosuda.
* {{Tomboy}}: Kazuki has rather boyish hair and was OneOfTheBoys in her childhood. This is the reason why Mayu fell in love with her in the first place.
* UnsettlingGenderReveal: Miyano's "prince" turned out to be {{Tomboy}} Kazuki years ago.

[[folder:Mrs. Ichihara]]

[[quoteright:200:http://static.tvtropes.org/pmwiki/pub/images/ishihara.jpg]]
[[caption-width-right:200:Mrs. Ichihara]]
She is Kanejou Kyouka's private maid and wants her to give up on her brother.

* HiddenDepths: She is first shocked by Kanejou's try to seduce Kosuda, but afterwards comes up with a foolproof hint for Kanejou's plan. [[spoiler:We never learn what it is, because Kosuda has already left.]]
* SatelliteCharacter: Her whole character exists around Kanejou and she never interacts with anybody else.
* SculleryMaid: She's Kyouka's private maid and believes that Kyouka is a proper lady, at first at least.

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[[folder:Matsuo Daisuke]]

[[quoteright:200:http://static.tvtropes.org/pmwiki/pub/images/daisuke_8.jpg]]
[[caption-width-right:200:Matsuo Daisuke]]
Matsuo is Takeshita's boyfriend but she misses him very much and even gets jealous at times, as he goes to the nearby college.

* BigBrotherMentor: Provides relationship advice to Kosuda.
* NiceGuy: Probably his most defining qualities since he is one of the nicest characters to Kosuda.
* TeenGenius: He's super intelligent and also very polite. To the point that Takeshita [[spoiler: gets jealous]]. Although they do not meet very often, he gives a lot advice to Kosuda.

[[folder:Yamada's mother]]

She's never seen in the anime and only on brief occasions in the mange.

* AbsurdlyYouthfulMother: She looks like 20 at best and resembles Yamada a lot.
* AdaptedOut: She has a small role in the manga and never appears in the anime.
* AdultsAreUseless: While she seems to be mildly aware of Yamada's sex craziness, she doesn't mind. Whether this is ParentalObliviousness or she's an OpenMindedParent is not fully clear.
* InvisibleParents: Most of the time in the manga, always in the anime.

[[folder:Kawai Mizuki]]

He's a [[OtokonokoGenre very feminine boy]] who does not appear until very late in the manga (''chapter 245''). He shows up at one of Akimoto's parties, where Misato immediately falls for him.

* DudeLooksLikeALady: He looks very feminine and gets mistaken for a girl all the time.
* ManInABikini: [[spoiler:When Misato goes to the pool with him, she's a bit uneasy about his swimming suit but gets over it.]]
* NiceGuy: His ''other'' defining character trait is to be very kind and polite.
* WholesomeCrossdresser: [[spoiler:He shows up in the very end in a dress and with a hair ribbon and asks Misato if she will still accept him this way. She does.]]

!Other Characters

[[folder:Kanejou Keiichi]]

[[quoteright:200:http://static.tvtropes.org/pmwiki/pub/images/keiichi.jpg]]
[[caption-width-right:200:Kanejou Keiichi]]
He is Kyouka's brother and primary target of her sexuality. He's a student at Harvard Business School and is very popular and handsome. When he returns to Japan to visit his sister, he wants Yamada to become his girlfriend, to his sisters dismay. Misato has huge interest in him.

* TheAce: He is super good at everything he does. He goes to the best university and has a huge career in his later life. Everybody admires him besides Yamada.
* AnimeHair: He has the most anime-like hair of all characters and an unnatural hair color.
* BishieSparkle: Just like his sister to underline his handsomeness, he's always surrounded by it.
* ChickMagnet: Keiichi is super-handsome and women are constantly throwing themselves at him. He could very well be TheCasanova but he chooses not to [[spoiler:partially because he's in no rush to have sex, if he can get it anytime he wants and even surprises everyone when he says that he's still a virgin.]] He falls for Yamada ''because'' she's disinterested.
* NoChallengeEqualsNoSatisfaction: Although many women love him he's not very much interested in them because they are too easy to have. Yamada is the first girl to not instantly fall for him so he goes for her.
* [[spoiler:UnexpectedVirgin]]: When he confesses to Yamada while she's on a date with Kosuda, she turns him down [[spoiler:because she believes that he's not a virgin. To Yamada's and everybody else's surprise, he admits that he is indeed a virgin, mainly because he could have it every day and this turns him off]].
* YouGottaHaveBlueHair: He has magenta hair, just like his sister.

[[folder:Kosuda Kazuki]]

[[quoteright:200:http://static.tvtropes.org/pmwiki/pub/images/kazuki_7.jpg]]
[[caption-width-right:200:Kosuda Kazuki]]
Kazuki is Kosuda's big sister. She's a college student still living with his brother and more out-going than him. She helps him with planning his dates.

* BikerBabe: She wears a biker outfit very often, when she's outside.
* {{Bokukko}}: She refers to herself with male Japanese pronouns.
* CoolBigSis: She is very happy when Kosuda brings Yamada to his home and goes away for two hours. She also gives him dating plans and even sex tips, although she's upset at first when he asks her for it.
* OneOfTheBoys: She was already very tomboyish and Miyano's "prince" when she was younger and for some reason the reason why Miyao fell in love with Kosuda.
* ShamelessFanserviceGirl: Both in-universe and out of it. She runs around naked very often in the house, much to Kosuda's anger.
* SiblingYinYang: She is much more self-confident and outgoing than Kosuda.
* {{Tomboy}}: Kazuki has rather boyish hair and was OneOfTheBoys in her childhood. This is the reason why Mayu fell in love with her in the first place.
* UnsettlingGenderReveal: Miyano's "prince" turned out to be {{Tomboy}} Kazuki years ago.

[[folder:Mrs. Ichihara]]

[[quoteright:200:http://static.tvtropes.org/pmwiki/pub/images/ishihara.jpg]]
[[caption-width-right:200:Mrs. Ichihara]]
She is Kanejou Kyouka's private maid and wants her to give up on her brother.

* HiddenDepths: She is first shocked by Kanejou's try to seduce Kosuda, but afterwards comes up with a foolproof hint for Kanejou's plan. [[spoiler:We never learn what it is, because Kosuda has already left.]]
* SatelliteCharacter: Her whole character exists around Kanejou and she never interacts with anybody else.
* SculleryMaid: She's Kyouka's private maid and believes that Kyouka is a proper lady, at first at least.

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[[folder:Matsuo Daisuke]]

[[quoteright:200:http://static.tvtropes.org/pmwiki/pub/images/daisuke_8.jpg]]
[[caption-width-right:200:Matsuo Daisuke]]
Matsuo is Takeshita's boyfriend but she misses him very much and even gets jealous at times, as he goes to the nearby college.

* BigBrotherMentor: Provides relationship advice to Kosuda.
* NiceGuy: Probably his most defining qualities since he is one of the nicest characters to Kosuda.
* TeenGenius: He's super intelligent and also very polite. To the point that Takeshita [[spoiler: gets jealous]]. Although they do not meet very often, he gives a lot advice to Kosuda.

[[folder:Yamada's mother]]

She's never seen in the anime and only on brief occasions in the mange.

* AbsurdlyYouthfulMother: She looks like 20 at best and resembles Yamada a lot.
* AdaptedOut: She has a small role in the manga and never appears in the anime.
* AdultsAreUseless: While she seems to be mildly aware of Yamada's sex craziness, she doesn't mind. Whether this is ParentalObliviousness or she's an OpenMindedParent is not fully clear.
* InvisibleParents: Most of the time in the manga, always in the anime.

[[folder:Kawai Mizuki]]

He's a [[OtokonokoGenre very feminine boy]] who does not appear until very late in the manga (''chapter 245''). He shows up at one of Akimoto's parties, where Misato immediately falls for him.

* DudeLooksLikeALady: He looks very feminine and gets mistaken for a girl all the time.
* ManInABikini: [[spoiler:When Misato goes to the pool with him, she's a bit uneasy about his swimming suit but gets over it.]]
* NiceGuy: His ''other'' defining character trait is to be very kind and polite.
* WholesomeCrossdresser: [[spoiler:He shows up in the very end in a dress and with a hair ribbon and asks Misato if she will still accept him this way. She does.]]

* ShamelessFanserviceGirl: Yamada gives lots of fanservice to the audience but still is often ashamed when Kosuda sees too much of her (although she shows him herself).

* ShipperOnDeck: Takeshita wants Kosuda and Yamada become a couple over the course of the manga but at one point believes that Kosuda would be better off with Miyano.
* SourOutsideSadInside: [[spoiler:She is very deadpan when it comes to Yamada, but (in the manga) we learn that she's sexually frustrated and misses his boyfriend very much).]]

* ApatheticTeacher: She seems to be benevolent but appears to have SeenItAll already, so she doesn't take much notuce of what's happening around her.
* ChristmasCake: She's 27 and still single, but other that Akai, she doesn't mind in the slightest.

-->'''Miharu:''' What the hell is wrong with you? You're wearing a skirt!

* TitleDrop: Kosuda wears a sweater in the manga that says "B Type H System". He also sings the theme song in ""episode 12'', where the title appears.

* SoreLoser: She can't take it very well that she loses the beauty contest against Yamada and wants to take revenge.

-----

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Another one of Yamada's classmates although she is rather cynical and desperately looks for a boyfriend.

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* AnAesop: Don't hate/distrust all boys even if one cheated on you. Evidenced by the ending where she [[spoiler:becomes Kudou's girlfriend]].

!The Eros Deities

[[folder:As a whole]]
->''"Each person has their own god of sex, who guides their desires and watches over their sex lives. [...] And the more the person has sex, the higher standing the god has."''
-->-- '''Narration''' in ''chapter 175'' of the manga

They are deities who watch over the characters and try to bring their sexual desires to fulfillment. Each character has (at least) one, although there are also people who don't have them, for example [[spoiler:Kanejou Keiichi]]. Yamada's and Kosuda's are the ones the audience mostly sees in the animé (see their respective folders), but in the manga we see many others:

** Miyano's looks like a fairy or a MagicalGirl, and gives very innocent advice ("If you kiss the cookies before he eats them, it'll be like an indirect kiss!") She mostly appears when Miyano supports Kosuda's love for Yamada.
** Uniquely, Takeshita has ''two'': One ("ero minus") is dressed as a businesswoman and takes relationships very seriously, giving the sort of advice that Takeshita gives to Yamada. The other one ("ero plus"), however, is a complete maneater and represents a rather suppressed trait of Takeshita's personality. They are fighting most of the time and it seems that [[spoiler:"ero plus" is winning]].
** Kyouka's is a stereotypical European noblewoman, complete with fan and PimpedOutDress.
** Akai-sensei's is a high school girl, reason being that she never got a chance to mature since Akai was always busy with work.
** Kazuki's has longer hair, wears a Chinese shirt, and is very popular with other female eros deities.
** Katase's is a lonely, mature, incredibly beautiful and mysterious woman and by far the most beautiful of the eros deities. She firmly believes that Katase wants a boyfriend despite her obvious hatred of men.
** Chika's eros deity is identical to her in every way.

* DreamPeople: They often appear in dreams. Yamada cannot see or hear hers initially until she tells her in a dream that Yamada's ero power is decreasing and that she has to make a move on Kosuda. Takeshita also confirms that she has seen hers in her dreams.
* FlyingOnACloud: They do this most of the time, although not always. Yamada's flies on a pink one.
* GhostInTheMachine: Although they are usually external manifestations, they appear to be internal manifestions and the true self (or a suppressed version of it) of the characters too.
* InvisibleToNormals: They usually can't be seen or heard by everyone unless they want to be seen (although Kosuda's at one point fails to be noticed). They appear in dreams for the most time but the characters seem to feel their presence or feel their feelings on occasions.
* LoveGoddess: They are all deities to watch over sexual desires. Kosuda's is male however.
* SexIsGood: All of them want their character's sexual wishes to be fulfilled to get a higher rank in heaven. They genuinely believe that having sex is good and increasing ero power is important. Yamada's sex goddess invokes this trope the most, as she genuinely want Yamada to have sex and does not want to stop her from her goals (although she believes that Yamada has to mature). Kosuda's invokes it the least as he's completely incompetent but he starts laughing whenever he's summoned.

[[folder:Yamada's Sex God]]

[[quoteright:200:http://static.tvtropes.org/pmwiki/pub/images/yamada_sex_god.jpg]]
[[caption-width-right:200:Yamada's Sex God]]
She appears to be an older and rather deformed version of Yamada with a mustache. Her role in the anime is much bigger and she takes the part of the narrator too. She seems to care about Yamada a lot and while Yamada is skeptical about her at first, she accepts her as her guide after she appeared in Yamada's dream.

* AscendedExtra: Her role in the anime is much larger than in the manga. Unlike in the manga, she appears from the very beginning, takes the role of a narrator, has lots of dialog and flies around most of the time.
* BeingGoodSucks: She genuinely wants to bring Yamada's dreams to fulfillment but struggles very much and fears about her reputation in heaven.
* {{Determinator}}: She is not willing to give up until Yamada loses her virginity. This means a lot of punishment.
* EthicalSlut: She strongly believes SexIsGood and wants Yamada to do it and eventually turn her into this trope. Whenever Yamada gets a step closer to it, she is genuinely happy and believes that Yamada has developed further. She wants Yamada to mature still and is quite frustrated that Yamada is such a difficult case.
* GirlsWithMoustaches: She has a white mustache and a pink kimono. Yamada imagines once that Takeshita's also should have a mustache (they don't).
* HeroicBSOD: Yamada's Eros Deity goes [[ColorFailure white with shock]] and is insensate for about a week when [[spoiler:Yamada and Kosuda fail to reached penetrative sex despite ''being naked in a love hotel'']].
* [[MrExposition Ms Exposition]]: She explains a lot of the plot to the audience in the first episodes of the animé.

[[folder:Kosuda's Sex God]]
->'''Kosuda''': ''"Can you give me some advice?"''
->'''Kosuda's Sex God''': ''"Only to masturbate and go to bed."''
-->-- In ''chapter 96'' of the manga

[[quoteright:200:http://static.tvtropes.org/pmwiki/pub/images/kosuda_sex_god.jpg]]
[[caption-width-right:200:Kosuda's Sex God]]
Kosuda's Sex God wears a bathrobe and is very lazy and unhelpful, and mostly just appears when Kosuda gets an erection and crackles a laugh.

* BeAsUnhelpfulAsPossible: He is completely useless and never gives out any useful advice. Kosuda even complains about this once in the manga. However, Kosuda's sex god still seems to be benevolent.
* HeavySleeper: He sleeps a lot on his cloud and only wakes up when he feels like it.
* LazyBum: His laziness is beyond comparison. He is usually tired, lies around, reads magazines, and does not give useful advice.
* PajamaCladHero: He is never seen without his bathrobe.
* SignatureLaugh: Whenever Kosuda gets an erection he starts laughing, much to Kosuda's embarrassment.
* SomethingElseAlsoRises: Whenever Kosuda gets an erection, he appears as a stand-in (pun intended) for his penis.

!Other Characters

[[folder:Kanejou Keiichi]]

[[quoteright:200:http://static.tvtropes.org/pmwiki/pub/images/keiichi.jpg]]
[[caption-width-right:200:Kanejou Keiichi]]
He is Kyouka's brother and primary target of her sexuality. He's a student at Harvard Business School and is very popular and handsome. When he returns to Japan to visit his sister, he wants Yamada to become his girlfriend, to his sisters dismay. Misato has huge interest in him.

* TheAce: He is super good at everything he does. He goes to the best university and has a huge career in his later life. Everybody admires him besides Yamada.
* AnimeHair: He has the most anime-like hair of all characters and an unnatural hair color.
* BishieSparkle: Just like his sister to underline his handsomeness, he's always surrounded by it.
* ChickMagnet: Keiichi is super-handsome and women are constantly throwing themselves at him. He could very well be TheCasanova but he chooses not to [[spoiler:partially because he's in no rush to have sex, if he can get it anytime he wants and even surprises everyone when he says that he's still a virgin.]] He falls for Yamada ''because'' she's disinterested.
* NoChallengeEqualsNoSatisfaction: Although many women love him he's not very much interested in them because they are too easy to have. Yamada is the first girl to not instantly fall for him so he goes for her.
* [[spoiler:UnexpectedVirgin]]: When he confesses to Yamada while she's on a date with Kosuda, she turns him down [[spoiler:because she believes that he's not a virgin. To Yamada's and everybody else's surprise, he admits that he is indeed a virgin, mainly because he could have it every day and this turns him off]].
* YouGottaHaveBlueHair: He has magenta hair, just like his sister.

[[folder:Kosuda Kazuki]]

[[quoteright:200:http://static.tvtropes.org/pmwiki/pub/images/kazuki_7.jpg]]
[[caption-width-right:200:Kosuda Kazuki]]
Kazuki is Kosuda's big sister. She's a college student still living with his brother and more out-going than him. She helps him with planning his dates.

* BikerBabe: She wears a biker outfit very often, when she's outside.
* {{Bokukko}}: She refers to herself with male Japanese pronouns.
* CoolBigSis: She is very happy when Kosuda brings Yamada to his home and goes away for two hours. She also gives him dating plans and even sex tips, although she's upset at first when he asks her for it.
* OneOfTheBoys: She was already very tomboyish and Miyano's "prince" when she was younger and for some reason the reason why Miyao fell in love with Kosuda.
* ShamelessFanserviceGirl: Both in-universe and out of it. She runs around naked very often in the house, much to Kosuda's anger.
* SiblingYinYang: She is much more self-confident and outgoing than Kosuda.
* {{Tomboy}}: Kazuki has rather boyish hair and was OneOfTheBoys in her childhood. This is the reason why Mayu fell in love with her in the first place.
* UnsettlingGenderReveal: Miyano's "prince" turned out to be {{Tomboy}} Kazuki years ago.

[[folder:Mrs. Ichihara]]

[[quoteright:200:http://static.tvtropes.org/pmwiki/pub/images/ishihara.jpg]]
[[caption-width-right:200:Mrs. Ichihara]]
She is Kanejou Kyouka's private maid and wants her to give up on her brother.

* HiddenDepths: She is first shocked by Kanejou's try to seduce Kosuda, but afterwards comes up with a foolproof hint for Kanejou's plan. [[spoiler:We never learn what it is, because Kosuda has already left.]]
* SatelliteCharacter: Her whole character exists around Kanejou and she never interacts with anybody else.
* SculleryMaid: She's Kyouka's private maid and believes that Kyouka is a proper lady, at first at least.

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[[folder:Matsuo Daisuke]]

[[quoteright:200:http://static.tvtropes.org/pmwiki/pub/images/daisuke_8.jpg]]
[[caption-width-right:200:Matsuo Daisuke]]
Matsuo is Takeshita's boyfriend but she misses him very much and even gets jealous at times, as he goes to the nearby college.

* BigBrotherMentor: Provides relationship advice to Kosuda.
* NiceGuy: Probably his most defining qualities since he is one of the nicest characters to Kosuda.
* TeenGenius: He's super intelligent and also very polite. To the point that Takeshita [[spoiler: gets jealous]]. Although they do not meet very often, he gives a lot advice to Kosuda.

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[[folder:Yamada's mother]]

She's never seen in the anime and only on brief occasions in the mange.

* AbsurdlyYouthfulMother: She looks like 20 at best and resembles Yamada a lot.
* AdaptedOut: She has a small role in the manga and never appears in the anime.
* AdultsAreUseless: While she seems to be mildly aware of Yamada's sex craziness, she doesn't mind. Whether this is ParentalObliviousness or she's an OpenMindedParent is not fully clear.
* InvisibleParents: Most of the time in the manga, always in the anime.

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[[folder:Kawai Mizuki]]

He's a [[OtokonokoGenre very feminine boy]] who does not appear until very late in the manga (''chapter 245''). He shows up at one of Akimoto's parties, where Misato immediately falls for him.

* DudeLooksLikeALady: He looks very feminine and gets mistaken for a girl all the time.
* ManInABikini: [[spoiler:When Misato goes to the pool with him, she's a bit uneasy about his swimming suit but gets over it.]]
* NiceGuy: His ''other'' defining character trait is to be very kind and polite.
* WholesomeCrossdresser: [[spoiler:He shows up in the very end in a dress and with a hair ribbon and asks Misato if she will still accept him this way. She does.]]

* SexIsGood: She gives Kanejou Kyouka a lecture about how much sex rises the value and femininity of a woman.

* WhatIsThisThingYouCallLove: Yamada goes through this often as her relationship with Kosuda develops. Sometimes her lack of understanding her feelings, or ignoring of feelings to prefer sexual fantasy, hinders their relationship development.

* ButtMonkey: He has to take a lot of punishment throughout the series and is usually the one who has to do the works for everybody else (his family) or run around and take pictures (on the school trip to Kyoto).

* TheLoinsSleepTonight: [[spoiler:As could have been expected of his loser personality, he fails to have an erection when they finally try to do it (this was changed in ''episode 12'' of the animé to a broken leg.]]

* ThisLoserIsYou: Kosuda is perceived as a loser by every character in the story, although Yamada and her sex goddess still have the best opinions about him (besides Miyano). One of his worst moments is when he meets Keiichi together with Yamada while Keiichi confesses to her while they are dating and some other girls in the bar point out how pathetic he is. He represents the average viewer who can't stand up for himself and what he believes in and just happens to be lucky or unlucky to be chased by Yamada.

* BigFancyHouse: Her house is absolutely huge and does more resemble a Disney Princess Castle. She also has many maidens.

* WithFriendsLikeThese: He is the closest thing that Kosuda has to a "friend" in his class, but he still mostly stays with his clique and also believes that Kosuda is a loser a treats him rather bad, just like everybody else.

* GirlsWithMoustaches: She has a white mustache and a pink kimono.

* ClingyJealousGirl: PlayedForLaughs, but during the Double Date to the water park in the second episode, Takeshita becomes paranoid that ''both'' Yamada and Kosuda are trying to flirt with Daisuke.

* SelectiveObliviousness: Just like her younger brother, Kazuki is completely oblivious to the fact that Miyano has feelings for him.

* ChildrenAreInnocent: Chika believes that Yamada is a good girl. She has no idea about Yamada's sex craziness even though Yamada does not really hide it very much.

* ColorFailure: Very often, most notably when she witnesses Miyano telling Kosuda that she will come to his house in ''Episode 2''.
* ADateWithRosiePalms: Frequently in the manga (usually she calls it "doing H-stuff alone") which leads to a RunningGag that has the [[{{Yonkoma}} fourth panel]] featuring both her and Kosuda retreating to this simultaneously. This is mostly downplayed in the anime.

* TheImmodestOrgasm: She experiences several of them in the manga, usually when being alone.

* QuestForSex: Primarily Yamada's quest but it becomes Yamada and Kosada's joint quest over time.

Kosuda Takashi is Yamada's classmate and the primary target of her sexual desire, after she landed on him in the bookstore. He is perceived by Yamada and their classmates as being a plain and ordinary guy, and often enough outright as [[LoserArchetype complete loser]], although Yamada still holds the relatively best opinion of him. When Yamada makes advances on him, he is initially taken in, but becomes confused and anxious because of her mixed signals. He is a member of photography club and seems to be a rather boring person. He develops feelings for Yamada, but keeps guessing what she really wants. He has no idea about Yamada's plan to have 100 sex friends, [[spoiler:when he finally finds out, he says he doesn't mind.]] His childhood friend Miyano is secretly in love with him, which he is completely unaware of.

* ClingyJealousGirl: PlayedForLaughs, but during the Double Date to the water park in the second episode, Takeshita becomes paranoid that ''both'' Yamada and Kosada are trying to flirt with Daisuke.

* DeadpanSnarker: Takeshita's defining character trait is to have the sarcastic last word to Yamada's sex-crazy comments. On one point in the manga, she refuses to talk to Yamada until she matures.
* EmotionSuppression: [[spoiler:She has a suppressed wild side in her that is represented by her ''other'']] eros deity (she has two). Also she can't admit until very late in the manga that [[spoiler:she's jealous because of her boyfriend and misses him very much.]]

* GenkiGirl: She's very energetic, especially around Keiichi, and very childish too.

* [[spoiler:TheAlcoholic:]] In the manga, when Yamada first comes to her house, we learn that she [[spoiler:drinks a lot to drown her sorrows over being alone.]]
* ChristmasCake: She is about 25 but still single. She once had a boyfriend, but after [[spoiler:he couldn't get an erection when they wanted to have sex, she is still a virgin]].

* PassionateSportsGirl: She was this in her youth and still does a lot of sports like jogging.
* SenseiChan: She is not much older than her students, is good-looking and on friendly terms with her students. The story implies that she didn't really mature very much since high school because of her work. In the manga both she and Yamada had a boyfriend [[spoiler:who couldn't get erection when the first time should have happened. While Yamada can fix this problem eventually, Akai has remained a virgin until today]].

* MomentKiller: Yamada is afraid that Chika will be this when she has Kosuda in her room. Chika often disturbs Yamada, especially when Yamada is "doing H-stuff alone".

** Uniquely, Takeshita has ''two'': One is dressed as a businesswoman and takes relationships very seriously, giving the sort of advice that Takeshita gives to Yamada. The other one, however, is a complete maneater and represents a rather suppressed trait of Takeshita's personality. They are fighting most of the time.

* BigBrotherMentor: Provides relationship advice to Kosada.
* NiceGuy: Probably his most defining qualities since he is one of the nicest characters to Kosada.

** Despite being a LovableSexManiac, Yamada is quick to engage in SlutShaming whenever she thinks another girl is romantically interested in Kosuda.

* MasterOfTheMixedMessage: Towards poor Kosada, which drives a lot of the humor of the show.

* HypocriticalHumor: She says about Kosuda that it cute how easy virgins can be manipulated. Takeshita doesn't take long to point out that she's a virgin herself.

* StockShoujoBullyingTactics: Yamda tries to engage in this towards Miyano due to them both having feelings for Kosuda. Miyano proves to be so nice however that Yamada finds herself giving her advice instead.

* MasterOfMixedMessages: Towards poor Kosada, which drives a lot of the humor of the show.