[[foldercontrol]]

[[folder: The BSC]]
!!All

* BrattyTeenageDaughter: All of them have several moments of this.
* FriendToAllChildren
* HeterosexualLifePartners: Each pair of best friends: Kristy and Mary Anne, Claudia and Stacey, Dawn and Mary Anne, Jessi and Mallory.
* NiceGirl
* TrueCompanions: No matter what happens, the girls are there for each other.
* WiseBeyondTheirYears

!!Kristin Amanda Thomas

Known informally as Kristy, and rarely called anything else. Founded the club in the first book ''Kristy's Great Idea'', and became the President, renowned for having an endless stream of "great ideas" (including the Kid-Kits, and many one-off events such as the Mother's Day Surprise, the various day camps they ran, and so on). Her father ran out on the family when she was very young, and in ''Kristy's Big Day'', her mother got remarried to a "real live millionaire", Watson Brewer. Tomboyish and sporty, Kristy founded a kid's softball team for many of their sitting charges in ''Kristy and the Walking Disaster''. In later books, she had a bit of a romance with the coach of the Krushers' rival team, Bart of Bart's Bashers.

* AcademicAthlete: Kristy has the management skills to create the club and be its president. Her sport is softball and she even starts a kids' team. She's also a good student; in ''Kristy's Big Day'', it's noted that she consistently earns straight As.
* ACupAngst: Kristy is the only 8th grade BSC member to not wear a bra and sometimes feels bad about it.
* AmbiguouslyGay: Some fans suspect that Kristy fits this trope. She could occasionally be persuaded to wear a dress, and did have an on-off "boyfriend" named Bart, but never seemed to take as much of an interest in him as the other girls did with their own boyfriends (then finally broke up with him.) And in the movie, as TheNostalgiaChick noted, there's what can only be described as a LongingLook between her and Claudia.
** Though to be fair, she's only 12-13 in the books. She just may be too young to actually care about those sort of things.
* BrainyBrunette
* BrutalHonesty
* ControlFreak: On the one hand, Kristy's organization and strong personality allow the club to run smoothly and let the girls accomplish many things that pre-teen girls would often find difficult. On the other hand, she can sometimes run too tight a ship — she has a special glare for members who show up one minute late to a club meeting!
* CoolBigSis: Is seen this way by her stepsister Karen.
* DeathGlare
* DisappearedDad: Kristy's father, Patrick Thomas, abandoned his wife and four children and almost never calls or writes.
* GirlNextDoor
* HotBlooded
* ImNotPretty: "I don't think I'm as pretty as Mary Anne."
* JerkWithAHeartOfGold
* LimitedWardrobe: Her "uniform".
* KendoTeamCaptain: Of the Krushers.
* MassiveNumberedSiblings: After her mother remarries and adopts a baby with her second husband, the Brewer-Thomas family fits this trope, though a blended version of it.
* MiddleChildSyndrome: She has her moments of this.
* OnlyKnownByTheirNickname: In most books, identified only as "Kristy".
* OutdoorsyGal
* PassionateSportsGirl: Kristy loves sports, and even coaches a softball team for small children. She calls them Kristy's Krushers, and it includes many of the club's sitting charges.
* RealWomenDontWearDresses: Kristy in the film says that she felt like a pencil when she was wearing a dress her dad bought for her.
* RagsToRiches: Via her mother's second marriage. It changes very little about Kristy herself, though.
* {{Tomboy}}
** TomboyWithAGirlyStreak: Much more well-rounded about her tomboyishness pre-ghostwriter, she loved the bridesmaid dress for her Mom's wedding, wore skirts to school, likes babysitting (traditionally feminine), and [[GuiltyPleasures proclaimed beauty contests to be fun despite sexist]].
* TomboyAndGirlyGirl: Tomboy to Mary Anne's Girly Girl.
* TomboyishBaseballCap: On book covers, Kristy is always seen wearing baseball caps or visors. Softball is her fave sport.
* TwoFirstNames

!!Claudia Lynn Kishi

Vice-president of the club, by virtue of being the only one with her own private phone line. Additionally, her junk food habit meant that she always had snacks stashed in her bedroom that the other girls could eat during their meetings. Artistic, flighty, and [[BookDumb hopeless at school]], Claudia defied the "model minority" stereotype to an extent. Her family was very conservative, and she often felt as though she was being compared unfavorably to her genius older sister, Janine. She had many casual boyfriends, but few serious ones. In ''Claudia Kishi, Middle School Dropout'', she was pushed back to the seventh grade, only to be returned to the eighth grade with her friends in ''Claudia Makes Up Her Mind''.

* AnnoyingYoungerSibling: Sometimes to Janine, particularly in early books.
* AsianAirhead: Early books treated this very mildly; later books made her seem almost borderline developmentally delayed.
* BookDumb
* DeadpanSnarker: Or as close as the [=BSC=] ever gets.
-->'''Stacey''': [The local department store] lost their Santa Claus.\\
'''Claudia''': Disappeared between men's shoes and kitchenware, huh? I know that area. It's like the Bermuda Triangle.
* TheFashionista
** RummageSaleReject: Apparently, only when combining several of these.
* FoolishSiblingResponsibleSibling: The foolish to Janine's responsible.
* GenerationXerox: In one book, Claudia is shown pictures of her beloved grandmother Mimi as a teenager, and the resemblance is so strong that "we could have been twins."
* TheGloriousWarOfSisterlyRivalry: With Janine. She is "the pretty one".
* HairDecorations: She loves them.
* HormoneAddledTeenager
* IconicOutfit
* InformedAbility: Her artistic talent, which - due to the medium - is rarely shown.
** She's supposed to have a "cool" fashion sense and style but, based on the descriptions, most of her outfits seem just ridiculous.
* LikeGoesWithLike: In one of the Super Specials, there's a Japanese boy introduced solely to be a {{love interest}} for Claudia because she's Japanese-American.
* PopularIsDumb: Like Stacey, she's quite popular at school. Contrasting with her sister’s IntelligenceEqualsIsolation.
* SelfDeprecation
* SiblingYinYang: With Janine.
* SweetTooth
* TheUnfavorite: She sees herself as this compared to her TeenGenius older sister Janine, while Janine feels the same compared to pretty, popular Claudia.
* UnlimitedWardrobe

!!Mary Anne Spier

The secretary of the club, as she is extremely organized and had very neat handwriting. Was raised by her father, her mother having passed away when she was very young. In early books, her father Richard was very strict, but he gradually loosens up as time passes. She was Kristy's next-door neighbor before Kristy's move, and throughout most of the books is her ShrinkingViolet best friend. She was the first of the club members to have a steady boyfriend, club associate officer Logan Bruno, whom she meets in ''Logan Likes Mary Anne''. Becomes stepsisters with Dawn in ''Mary Anne and the Great Romance''.

* AuthorAvatar: Ann M Martin identified her as such.
* {{Beware the Nice|Ones}}/[[BewareTheQuietOnes Quiet Ones]]: Mary Anne gets ''extremely'' vindictive when pushed too far.
* BitchInSheepsClothing: Not always, but she comes off as this in some books.
* BrainyBrunette: She's a good student.
* DaddysGirl
* FragileFlower: Mary Anne is so sensitive she'll cry at long-distance telephone commercials.
* GirlNextDoor
* GirlishPigtails: In the early books, which leads us to...
* ImportantHaircut: Her friends do not take it well.
* ICantBelieveAGuyLikeYouWouldNoticeMe: Towards Logan.
* KindheartedCatLover: Her beloved kitten, Tigger.
* MissingMom: Mary Anne's mother died of cancer when she was very little.
* NaiveEverygirl
* OfficialCouple: With Logan.
* OverprotectiveDad: She has one.
* TheQuietOne
* RomanticTwoGirlFriendship: With Kristy.
* ShrinkingViolet
* SnarkKnight: For the one later Flanderized as the sweet, sensitive one, Mary Anne sure releases the snark sometimes:
--> Her "apology" note to Kristy after the girls fight in Book #2 (to her credit, she immediately recognizes it's rather passive-aggressive and decides not to send it): “Dear Kristy, I’m sorry you’re the biggest, bossiest know-it-all in the world, but what can I do about it? Have you considered seeking professional help?”
* SpellMyNameWithAnS: It's ''Mary Anne'', not Mary Ann/Marianne/Mariann/Maryann/Maryanne/Mary-Ann/Mary-Anne/etc.
* TenderTears: One of her defining traits.
* TomboyAndGirlyGirl: Girly Girl to Kristy's Tomboy.

!!Anastasia Elizabeth [=McGill=]

Known as Stacey. Originally from New York City, she moved to Stoneybrook when her father was transferred. Frequently described as chic, sophisticated and "boy-crazy", Stacey, like Claudia, had many boyfriends but few long-lasting relationships. She was the treasurer of the club, as she had a gift for mathematics. She moved back to New York in ''Goodbye, Stacey, Goodbye'' when her father was transferred back, but returned to Stoneybrook in ''Welcome Back, Stacey'' when her parents divorced, and her mother decided that she preferred living in the small-town environment. Frequent attention is paid to the fact that she is diabetic, and she is hospitalized multiple times throughout the series. She quits the club to spend more time with other friends in ''Stacey vs. the BSC'', but she rejoins in ''Stacey and the Bad Girls''.

* AllOfTheOtherReindeer: In New York, after being diagnosed with diabetes (and therefore missing a lot of school and losing all her friends). It's the main reason why she and her family moved to Stoneybrook in the first place. Stacey does manage to repair her friendship with Laine Cummings, but even after she moves back to New York, she's never really accepted back into that social circle. One of the major reasons she decides to move back to Stoneybrook after her parents get divorced is that Laine is her only friend in New York, while in Stoneybrook she has the club.
* BigApplesauce: Stacey is constantly reminding the readers how awesome New York is. The other book narrators make a big deal out of Stacey being from the city as well.
* [[BigBrotherMentor Big Sister Mentor]][=/=]CoolBigSis: To Charlotte Johanssen. They're both only children who experience social isolation - Stacey because of her illness, Charlotte because of being ahead of her classmates. In later books they sometimes even call each other "Big Sis" and "Little Sis."
* DoNotCallMePaul: Stacey does ''not'' like being called Anastasia.
* EmbarrassingFirstName: Stacey doesn't tell anyone her real name is Anastasia for a long time.
* EmbarrassingNickname: Her father calls her "Boontsie".
* EveryoneLovesBlondes: Pretty, smart, fashionable and very popular at school. She's seen as the "sophisticated New Yorker".
* TheFashionista
* FriendlessBackground: The run up to Stacey's diagnosis with diabetes was full of instances of her getting sick, including fainting at school and wetting the bed at a sleepover. Stacey was constantly being dragged out of school for more doctor's visits and tests. Because none of her friends knew what was going on -- just that she was somehow sick, possibly contagious, and missing enough school that she almost had to repeat sixth grade -- they started ostracizing her after the bedwetting incident. One of the reasons her father accepted the transfer to Connecticut was to get Stacey away from the bad memories. See AllOfTheOtherReindeer.
* GoodWithNumbers: She's the club treasurer on account of being a math whiz.
* HormoneAddledTeenager
* IllGirl: In general, but particularly in ''Stacey's Emergency''.
* OnlyKnownByTheirNickname: We don't even learn that Stacey ''is'' a nickname until Dawn takes her place as treasurer; Kristy wants to use their full names for a quick ceremony transferring the office.
* OverprotectiveDad and Mom: After she is diagnosed with diabetes.
* PluckyGirl
* PutOnABus: When Stacey's father gets transferred back to New York.
** TheBusCameBack: In ''Welcome Back, Stacey!'' she comes back to Stoneybrook with her mother.
* SawStarWarsTwentySevenTimes: In ''Kristy's Big Day'', she confesses that she watches ''Film/MaryPoppins'' once a week, totaling hundreds of times.
* SmittenTeenageGirl: Regularly crushes on other guys and has crushed on two older guys.
* SpellMyNameWithAnS: It's ''Stacey'', not Stacy.
* WhenYouComingHomeDad: Stacey's dad is a workaholic.

!!Dawn Read Schafer

Introduced in ''Mary Anne Saves the Day'', Dawn is the alternate officer of the club. Originally from California, Dawn moves to her mother's hometown of Stoneybrook when her parents divorce. She becomes fast friends with Mary Anne, which makes Kristy extremely jealous. She is identified throughout the series as being a very casual, individual health-food nut, though this was retooled in later books to place the emphasis more on environmental activism and strict vegetarianism, rather than simply being into health food. Her mother and Mary Anne's father marry in ''Mary Anne and the Great Romance''. Later in the series, she grows increasingly homesick, and moves back to California to live with her dad and younger brother in ''Dawn's Big Move''.

* BrattyTeenageDaughter: Dawn has probably the worst example of this trope in ''Here Come the Bridesmaids!'' when her father is getting remarried. She all but pitches a fit because her stepmother-to-be doesn't want to have Mary Anne as a bridesmaid as well as Dawn. Remember, Mary Anne is Dawn's stepsister on her mother's side and is not remotely related to Dawn's father, let alone his new bride.
** Keep in mind that Dawn never asked if Mary Anne could be a bridesmaid. She just assumed that Mary Anne would be sharing the moment with her and bought her a dress. To Dawn's credit, she never brings up her (frankly, stupid) assumption to her father or stepmother. But Mary Anne still ends up wearing the bridesmaid dress, because she assumed it'd be a church wedding, not a beach wedding, and didn't pack appropriately. One has to wonder just what Dawn's father and stepmother thought about that.
* CharacterizationMarchesOn: In early books, Dawn is into health food and "prefers" to not eat red meat, but still eats chicken and fish. In later books, she is a strict vegetarian.
** Her first book had her convince her just as health foodie Mom that they must serve things like hot dogs at their BBQ because this is what most residents of Stoneybrook eat. Later she makes a big deal out of things like cold cuts being served.
** In the very first book where she appears, according to Mary Anne (the narrator), Dawn is "not exactly pretty". In later books she is always described as drop-dead gorgeous.
** Books like ''Jessi Ramsey, Pet Sitter'' and ''Kristy and the Mother's Day Surprise'' also describe her as very organized -- not as organized as Mary Anne, but significantly more so than the other club members, which is why she's a good treasurer in the absence of Stacey. She's written this way mostly as a contrast to her mother. However, after her mother marries Mary Anne's father, she loses this trait and becomes much more casual and unconcerned with any kind of neatness, so that she and her mother would contrast Mary Anne and Richard Spier.
* ClingyJealousGirl: Shows a dose of this in ''Mary Anne's Makeover'', in which she admits that she's jealous of all the time Mary Anne's been spending with her father and that it makes her miss her own terribly. Dawn comes off as being resentful of Mary Anne for having her father around, apparently forgetting that he is Mary Anne's only living parent.
* CloudcuckoolandersMinder: For her mother.
* CoolBigSis: Most of the time she gets along with her younger brother.
* CountryMouse: In ''Stacey's Mistake'' when the girls go to visit Stacey in New York.
* EmbarrassingMiddleName: Read.
* EmbarrassingNickname: "Sunshine". Part of the reason it embarrasses her is because it's also her California best friend's full first name.
* EveryoneLovesBlondes
* GranolaGirl: She loves the beach and California living, is a health food nut, an environmentalist, and a strong opponent of guns and violence.
* HairOfGoldHeartOfGold: She's described as a really beautiful 13-year-old girl with very long blonde hair, so light it looks almost white. Dawn is also a very idealistic GranolaGirl who cares about environment.
* InformedAttribute: Dawn is usually described as being the "individual" of the group, but at times she changes herself to attract boys. For instance, in ''Dawn and the Older Boy'', she cuts her hair so a boy will like it better.
* ItsAllAboutMe: At her worst. Most notably in ''Dawn Saves The Planet'' and the above-mentioned example in ''Mary Anne's Makeover.''
* NewTransferStudent
* PutOnABus: Eventually she moves back to California.
* RapunzelHair
* SixthRanger
* SoapboxSadie: Infamously played straight in ''Dawn Saves The Planet.'' By the end of the story, it ends up blowing up in her face.
* StrawVegetarian

!!Mallory Pike

First introduced in ''The Truth About Stacey'' as a ten-year-old client, she is invited to join the club at age eleven in ''Hello, Mallory!'', after Stacey moves back to New York. The oldest of eight kids, Mallory is described as very responsible with children. Despite this, at first the club is hesitant to let her join because of her age, making her do a number of difficult tests before finally relenting and letting her and her best friend Jessi join the club. As she is the only one in her family with red hair, glasses and braces, Mallory often feels unattractive and an ongoing plot arc of hers was trying to convince her parents to let her spice up her look with contacts, pierced ears, and a new wardrobe. She is forced to leave the club for a while when she comes down with mononucleosis in ''Get Well Soon, Mallory''. She rejoins the club in ''Kristy and the Copycat'', but then leaves for good in ''The All-New Mallory Pike'' when she leaves for boarding school.

* AllGirlsLikePonies
* AscendedExtra
* {{Bookworm}}
* ButtMonkey: A list of the tragedies that befall her can be found [[http://community.livejournal.com/bsc_snark/39867.html here]].
* CoolBigSis: She's very good with children. See TeamMom.
* IAmNotPretty: How Mallory sees herself.
* MassiveNumberedSiblings: The Pikes have eight children, including identical triplets.
* MeaningfulName: Mallory is Norman French for "unlucky".
* {{Meganekko}}: Mallory wears glasses.
* NaiveEverygirl
* OffToBoardingSchool: In ''The All-New Mallory Pike''. In this case, however, going was her decision.
* OnlySaneMan: In many books where the club members are fighting, Mallory and Jessi serve as this.
* RedheadsAreUncool: As Mallory is the only one in her family with red hair, glasses and braces, she often feels unattractive and an ongoing plot arc of hers was trying to convince her parents to let her spice up her look with contacts, pierced ears, and a new wardrobe. She also feels like her parents treat her like a baby.
* SelfDeprecation
* SixthRanger
* StrawFan: In ''Mallory Pike, #1 Fan'', she comes across like this.
* TeamMom: She acts like this for her seven younger siblings, most notably in the book where their father loses his job; she helps them form 'the Pike Club' to deal with the situation on their own terms.
* ThoseTwoGirls: With Jessi.

!!Jessica Davis "Jessi" Ramsey

Jessi moved to Stoneybrook from Oakley, New Jersey at the beginning of the sixth grade, coincidentally into Stacey's old house. She has an eight-year-old sister called Rebecca or "Becca," and a baby brother named John Phillip Ramsey Jr., better known as "Squirt." Jessi is incredibly talented at ballet, and when she grows up she wants to become a professional ballet dancer. She has been doing ballet since she was four, and was admitted into a special ballet school in Stamford. She has had the lead role in several productions at that school. In book #115, ''Jessi's Big Break'', she had an opportunity to join the Dance New York programme and study ballet under David Brailsford for 3 1/2 weeks. Toward the end of the story, she was also given a chance to join the Dance New York programme full time, but she decided to accept it when she was a little older.

* TheAce
* AllGirlsLikePonies: Not as much as Mallory though.
* BlackBestFriend: To Mallory and the other girls.
* CoolBigSis: She's very close to her little sister and always takes care of her 14-month-old brother.
* CunningLinguist
* DivergentCharacterEvolution: Essentially Mallory 2.0 before later books explored her character.
* FriendlessBackground: Of the Newcomer variety. Doesn't help that many people are racist towards her and her family.
* NaiveNewcomer
* NewTransferStudent
* OnlyKnownByTheirNickname
* OnlySaneMan: Like Mallory, she doesn't go overboard on something like many of the other girls.
* ShesGotLegs
* SixthRanger
* SpellMyNameWithAnS: It's ''Jessi'', not Jessie.
* ThoseTwoGirls: With Mallory.
* TokenMinority: As every single book will tell you, she is the only black member.

!!Abigail "Abby" Stevenson

The final SixthRanger, taking over after Dawn left and DemotedToExtra as soon as ''Friends Forever'' started up. Abby moved with her mom and twin sister, Anna, from Long Island to Kristy's neighborhood in part for her mom to distance herself from Abby's father's death. Abby is a big joker, a natural athlete, asthmatic and allergic to half the things in any given room.

* AlterKocker: Abby's Grandpa Morris and Gram Elsie in ''Abby and the Mystery Baby''. Less so in other appearances.
* BlitheSpirit: Greatly enlivens [=BSC=] meetings with her jokes and her refusal to take Kristy ''too'' seriously.
* DisappearedDad: Abby's father was killed by a drunk driver prior to her series debut.
* GenkiGirl
* InformedJudaism
* NewTransferStudent
* OnlyKnownByTheirNickname
* PassionateSportsGirl
* PolarOppositeTwins: Abby and Anna.
* PungeonMaster
* SixthRanger
* TechnicianVersusPerformer: According to Kristy, Abby is a natural athlete, while Kristy is a sportsperson.
* TomboyAndGirlyGirl: Tomboy to Anna's girly girl.
* WhenYouComingHomeDad: Abby's mother is like this. Possibly justified to an extent, since she's a single parent with two teenagers to support.

!! Logan Bruno

Mary Anne's boyfriend and an associate club officer (basically a member who doesn't have to go to meetings). He moves into town from Louisville, Kentucky and is immediately smitten with the shy yet intelligent Mary Anne.

* ADayInTheLimelight: ''Logan's Story'' and ''Logan Bruno: Boy Baby-Sitter,'' two books where Logan narrates the story himself.
* AllAmericanFace
* BigManOnCampus
* CelebrityResemblance: Mary Anne initially liked him because he looks like her favorite actor.
* ControlFreak: Not a trait that is always present, but it's the reason why he and Mary Anne break up for a while.
* CoolBigBro: His style of dealing with kids, stemming from having two younger siblings of his own.
** BigBrotherMentor: Even to the other club members sometimes.
* HormoneAddledTeenager: Logan assumes you (the reader) assume he's this. When he does the typical chapter two description of the club members in his two books, he, just like the girls, describes Claudia and Stacey as beautiful and fashionable -- then he stops, and explains that just because he finds girls other than Mary Anne attractive doesn't mean that he's going to cheat on her or that he likes them better than Mary Anne, that Mary Anne is his girlfriend and that she's amazing, etc.
* LovableJock
* NiceGuy
* OffToBoardingSchool: He was almost sent away to his dad's old boarding school but he and Mary Anne managed to talk his father out of it.
* TheOneGuy
* RealMenWearPink: Enjoys baby-sitting, despite the stereotype that it's a "girly" activity.
* SixthRanger

!!Shannon Kilbourne
The second associate club officer, Shannon was invited to join the club on a more permanent basis but declined as she was too busy with her other extra-curricular activities to commit to the club meetings. Shannon was introduced when Kristy moved across town to live with her new rich step-father, and was originally portrayed as a "snobby" foil to Kristy. Shannon became a full member of the club briefly in books 67 - 81, when she replaced Dawn as the alternate officer.

* TheAce
* AscendedExtra: Unlike Logan, who is both Mary Anne's boyfriend and the other girls' classmate and thus often present during school plotlines or crowd scenes, Shannon is just a neighbor of Kristy's, and later, Abby's. She's usually just a footnote in the explanation of an Associate Member of the club is, but there was a brief stretch of books (including Mysteries and at least one Super Special) where she replaced Dawn as the Alternate Officer and was a regular at club meetings and babysitting B-plots. She also makes a random guest appearance in ''Dawn's Family Feud'', while Dawn and Mary Anne are on vacation, to help Claudia sit for the Barrett-DeWitts.
* AlphaBitch: Her original characterization in "Kristy and the Snobs".
** LovableAlphaBitch: See CharacterDevelopment.
* CharacterDevelopment
* ADayInTheLimelight: ''Shannon's Story''
* EmbarrassingNickname: Shannie. She doesn't mind her charges calling her that in her initial appearance, but it embarrasses her when her mom uses it.
* ExtracurricularEnthusiast
* JerkWithAHeartOfGold: Ends up bonding with Kristy when Kristy's dog passes away, despite having been engaged in a vicious prank war with her before that.
* OneSteveLimit: Averted; Kristy's brother names their new dog Shannon after the human Shannon. Most books featuring both point out this confusion.
* RichBitch: The way she is introduced. She gets better.
* SilkHidingSteel: When Kristy and the [=BSC=] first babysit for the Delaneys, the children boss them around and treat them like servants. Kristy ends up going along with it, getting them drinks and so on. When they try this on ''Shannon'', who has been babysitting them for years, she just lifts an eyebrow and they meekly get their own drinks.
* SixthRanger
* SpoiledSweet
* [[WeNamedTheMonkeyJack We Named The Dog Shannon]]
[[/folder]]

[[folder: Kids]]
!!David Michael Thomas

Kristy's little brother and most frequent sitting charge, at least in the first book or two.

* AnnoyingYoungerSibling: Happens more as he grows older; in the first few books, he's still a pretty little guy and very sweet.
* RagsToRiches: Like Kristy, on account of their mother's remarriage to a millionaire.
* [[TwoFirstNames Three First Names]]
* TheUnfavorite: Gets this treatment from his father in ''Kristy's Big News'', where he's the only one of the four Thomas kids not invited to the wedding - or even to participate in the phone conversation.
* VitriolicBestBuds: With Karen.

!!Karen Brewer

Daughter of Kristy's stepfather Watson from his first marriage. Neither of the girls has ever had a sister, which helps them to bond.

* AnnoyingYoungerSibling: Though Kristy gets along well with her.
* AuthorAvatar: The author describes her as the kind of child she'd love to have been.
* BrattyHalfPint
* GenkiGirl
* GirlsLoveStuffedAnimals
* [[MrImagination Miss Imagination]]
* MouthyKid
* NightmareFetishist
* SiblingYinYang: With Andrew.
* WiseBeyondTheirYears

!!Andrew Brewer

Karen's little brother.

* TheQuietOne
* ShrinkingViolet
* SiblingYinYang: With Karen.

!!Charlotte Johanssen

One of the sitting charges. She's an extremely bright child, and in the third book it's revealed that she's bullied by her classmates for being so smart. She gets to skip a grade, which resolves the issue. She and Stacey become very close and regard each other as honorary sisters.

* BrainyBrunette
* CanineCompanion: Her schnauzer, Carrot.
* IntelligenceEqualsIsolation: Initially.
** FriendlessBackground
* LonerTurnedFriend
* ShrinkingViolet
* WiseBeyondTheirYears

!!Jamie Newton

A longtime sitting client, who regards Kristy and Claudia as his favorite sitters. He stays with Kristy when his mother gives birth to his baby sister Lucy.

* AdorablyPrecociousChild
* BigBrotherInstinct: Towards Lucy.
* CheerfulChild
* TheCutie

!!Myriah Perkins

The eldest daughter of the family who moves into Kristy's childhood home after Kristy's mom remarries and the Thomases move to Watson's mansion.

* TheAce
* CheerfulChild
* GenkiGirl
* WiseBeyondTheirYears

!!Gabbie Perkins

Myriah's younger sister.

* AdorablyPrecociousChild
* CheerfulChild
* TheCutie
* FullNameBasis: She calls people by their full names.
* WiseBeyondTheirYears

!!Adam, Byron and Jordan Pike

Mallory's younger brothers, identical triplets.

* AnnoyingYoungerSibling
* [[BigBrotherBully Big Brother Bullies]]: To Nicky. Especially in "The Ghost at Dawn's House".
* BigEater: All of them, but Byron especially
* SameSexTriplets
* SensitiveGuyAndManlyMan: Byron's Sensitive Guy to Adam and Jordan's Manly Men.
* [[TricksterTwins Trickster Triplets]]

!!Vanessa Pike

The second-oldest Pike child.

* AnnoyingYoungerSibling
* {{Cloudcuckoolander}}
* DitzyGenius
* [[MrImagination Miss Imagination]]
* RhymesOnADime: She wants to be a poet.

!!Nicky Pike

The youngest of the four Pike boys, and the only one who isn't a triplet.

* AnnoyingYoungerSibling
* ButtMonkey: Especially when the triplets are around
* MiddleChildSyndrome

!!Margo Pike

The second-youngest Pike, best known for her easily-upset stomach.

* AnnoyingYoungerSibling
* BigSisterInstinct: Can be pretty protective of Claire, whom she sees as her best friend.
* IllGirl: She gets sick easily. Pretty much her main trait.

!!Claire Pike

The youngest of the eight Pike children.

* AnnoyingYoungerSibling
* BrattyHalfPint
* {{Cloudcuckoolander}}
* GenkiGirl
* TheNicknamer: She goes through an extremely silly phase in some of the books where she does this, dubbing her parents "Moozie and Daggles" and tacking "silly-billy-goo-goo" onto other people's names.
[[/folder]]

[[folder: Other Characters]]
!!Charlie Thomas

Kristy's oldest brother. When the Thomases move to Watson's neighborhood, the club starts paying Charlie to drive Kristy to and from club meetings so she doesn't have to give it up, since it's too far to walk.

* BigEater
* CoolBigBro
* LovableJock
* NiceGuy
* RagsToRiches
* TeamDad: To his younger brothers and sister. It's revealed in ''Kristy's Big News'' that after their father walked out on the family, he quit his school's baseball team in order to take care of them in the afternoons while their mother worked.

!!Sam Thomas
Kristy's middle brother. He has a mutual attraction going on with Stacey and likes to prank-call the club during meetings.

* CoolBigBro
* HormoneAddledTeenager
* ThePrankster
* RagsToRiches
* ShipTease: With Stacey.

!!Janine Kishi

Claudia's older sister, a certified genius high school student who takes classes at the local community college.

* AsianAndNerdy
* [[BigBrotherInstinct Big Sister Instinct]]: YOU NEVER ACCUSE AND/OR FRAME CLAUDIA FOR CHEATING ON A TEST AND EXPECT TO GET AWAY WITH IT.
* BrainyBrunette
* CharacterDevelopment: She starts to come out of her shell a little more as the series goes on. Claudia even notes that after Mimi's death she spends less time at her computer.
* CoolBigSis: She has her moments and reveals to [[NotSoDifferent Claudia that she has a hidden candy stash in her room]].
* TheGloriousWarOfSisterlyRivalry: With Claudia. She the "smart one".
* FoolishSiblingResponsibleSibling: The Responsible to Claudia's Foolish.
* InsufferableGenius
* IntelligenceEqualsIsolation
* SesquipedalianLoquaciousness
* SiblingYinYang: With Claudia.
* TeenGenius

!!Cokie Mason

A classmate of the girls who resents them and tries frequently to make them look ridiculous.

* AlphaBitch
* BookDumb
* HoistByHisOwnPetard: Every time she tries to prank the club.
* OnlyKnownByTheirNickname: Her real name is Marguerite.
* TheRival: To the club, but especially Mary Anne.

!!Grace Blume

Cokie's best friend.

* BetaBitch
* LovableAlphaBitch: Actually becomes friendly with the girls on occasion.
* RichBitch

!!Alan Gray

One of the girls' classmates, a practical joker who nurses a crush on Kristy.

* ClassClown
* LovingBully: To Kristy.
* VitriolicBestBuds: Kristy may find him annoying, yet she acknowledges he's fun and even invites him to Mary Anne's surprise party.
[[/folder]]
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