Full name Kristin Amanda Thomas. 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.
Academic Athlete: 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.
A-Cup Angst: Kristy is the only 8th grade BSC member to not wear a bra and sometimes feels bad about it.
Ambiguously Gay: 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 The Nostalgia Chick noted, there's what can only be described as a Longing Look 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.
Control Freak: 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!
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 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.
The secretary of the club, as she was 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 loosened up as time passed. She was Kristy's next-door neighbor before Kristy's move, and throughout most of the books is her Shrinking Violet 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 step-sisters with Dawn in Mary Anne and the Great Romance.
Full name Anastasia Elizabeth McGill. 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 quit the club to spend more time with other friends in Stacey vs. the BSC, but she rejoins in Stacey and the Bad Girls.
All of the Other Reindeer: 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.
Big Applesauce: 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.
Big Sister Mentor: To Charlotte Johannsen. 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."
Friendless Background: 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. After her diagnosis, her parents kept it a secret from all but close family and Stacey, who was 11, naturally followed their example. Both of her parents became obsessed with the idea of a "miracle cure," and in addition to the normal testing and sickness from the adjustment period, 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. 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.
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.
Bratty Teenage Daughter: 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.
Characterization Marches On: 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.
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.
Clingy Jealous Girl: 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.
Granola Girl: She loves the beach and California living, is a health food nut, an environmentalist, and a strong opponent of guns and violence.
Hair of Gold, Heart of Gold: 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 Granola Girl who cares about environment.
Informed Attribute: 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.
It's All About Me: At her worst. Most notably in Dawn Saves The Planet and the above-mentioned example in Mary Anne's Makeover.
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.
Only Sane Man: In many books where the club members are fighting, Mallory and Jessi serve as this.
Redheads Are Uncool: 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.
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.
Token Minority: As every single book will tell you, she is the only black member.
Abigail "Abby" Stevenson
The final Sixth Ranger, taking over after Dawn left and Demoted to Extra 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.
Alter Kocker: Abby's Grandpa Morris and Gram Elsie in Abby and the Mystery Baby. Less so in other appearances.
Blithe Spirit: Greatly enlivens BSC meetings with her jokes and her refusal to take Kristy too seriously.
Disappeared Dad: Abby's father was killed by a drunk driver prior to her series debut.
When You Coming Home, Dad?: Abby's mother is like this. Possibly justified to an extent, since she's a single parent with two teenagers to support.
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.
A Day in the Limelight: Logan's Story and Logan Bruno: Boy Baby-Sitter, two books where Logan narrates the story himself.
Hormone-Addled Teenager: 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.
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.
Ascended Extra: 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-De Witts.
Alpha Bitch: Her original characterization in "Kristy and the Snobs".
Jerk with a Heart of Gold: Ends up bonding with Kristy when Kristy's dog passes away, despite having been engaged in a vicious prank war with her before that.
One Steve Limit: Averted; Kristy's brother names their new dog Shannon after the human Shannon. Most books featuring both point out this confusion.
Rich Bitch: The way she is introduced. She gets better.
Silk Hiding Steel: 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.
Team Dad: To his younger brothers and sister. It's revealed in one of the books 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.