Mary Catherine WhitneyMary Catherine is sweet, impulsive and the most amazingly infuriating errant schoolgirl to ever stand in front of Dean Michaels desk. No wonder he has such a soft spot for her!
Douglas (Doug) AbbottA student at Saint Sebastians, he dates Mary Catherine throughout her junior year and part of her senior year at Saint Francis. They were friends first and it developed into something more after the events in Casual Fridays.
Tamara (Tammy) AdamsOne of Mary Catherines Trio of Terror as Mary affectionately refers to her most unruly freshman. Shes a cheerleader and quite a practical joker at times.
Heather BatesAshleys roommate and a rival of Mary and Mandys at Saint Anthonys.
Ashley BeckerHeathers roommate and a rival of Mary and Mandy's at Saint Anthonys.
Amanda (Mandy) BennettóMary Catherines best friend and closest confidante. Theyve known each other ever since they were roommates at Saint Anthonys.
Olivia BrowningA year ahead of Mary Catherine at Saint Francis, Olivia is a close friend and Marys SA in Trustees Hall during her junior year at school.
Miss ClairHeadmistress of Saint Anthonys School for Girls. She tolerates Mandy but is constantly at odds with Mary Catherine. Miss Clair is extremely mean-spirited and enjoys making the girls cry.
Miss CrawfordMary Catherine and Mandys housemother in 7th grade at Saint Anthonys. She has a soft spot for Mary and Mandy.
Brittney (Britt) DanielsThree years ahead of Mary at Saint Francis, Britt is a mentor to Mary Catherine. She is definitely not the sort of role model Andy would like for Mary, but he has a soft spot for Brittno matter how much trouble she gets into with her adventures on the Plaid Market & the Deadbeat Club.
Father DavisThe priest at Saint Francis.
Miss DeavonsThe head cook at Saint Francis. She always thinks Andy is much too thin!
Tim DownsDean of Flintridge Prep. Hes a good friend of Andys and he dates Amy in the college years.
Kristin EricksonA close friend of Mary Catherine's at Saint Francis, they met freshman year. She's from a working class family who lives on a ranch in Montana.
Eleanor FitzpatrickA year older than Mary Catherine, Eleanor is Senior Class President at Saint Francis during Marys junior year.
Paige HansonThe owner of The Reformatory, the spanking club where Mary takes a job to earn money her senior year at Saint Francis. She becomes a confidante of Mary Catherines.
Dennis JacksonA year older than Mary and the object of her first big crush. They date briefly during her sophomore year at Saint Francis.
Anna KincaidOne of the girls who works with Mary at The Reformatory.
Valerie LancasterThe second youngest of the four Ls, Valerie is the only one of the Lancaster sisters who isnt an enemy of Mary Catherines. In terms of looks she closely resembles all of her more evil sisters, but her biggest fault is being too scared of Victoria, Vanessa and Veronica to stand up to them.
Vanessa LancasterA year younger than Victoria, Vanessa is nearly as mean as Victoria and as spoiled as Veronica. Known by the other girls as The Snitch for her tattletelling ways. She also has quite a wild reputation with the boys at Saint Sebastians.
Veronica LancasterMary Catherines greatest enemy. Shes an 180 degree opposite of Mary. Head cheerleader, incredibly beautiful and built (think a real life, three-dimensional Jessica Rabbit), and is extremely cruel.
Victoria LancasterThe oldest of the Lancaster sisters, Victoria was Marys SA in Benning Hall during the fall of her freshman year. Mean, vindictive and not someone you want to crossparticularly when shes holding her floor paddle Thumper in her hand! Known as the Wicked Bitch of Benning Hall.
Miss LandryMary Catherine and Mandy's housemother in 6th grade at Saint Anthony's. She does NOT like the two of them . . . thinks they're troublemakers.
Helen LewisAndys personal assistant and right arm. Shes an older, kind, motherly sort of woman who has a soft spot for Mary (and Andy too for that matter).
Amy PendryA close friend/rival of Mary Catherines. She attends Flintridge Prep in California and later is Marys roommate at Stanford. She dates Tim Downs, former Dean at Flintridge Prep once shes in college.
Dr. Scott ReardonMarys doctor following her riding accident and a friend of Andys from his days at Saint Sebastians.
Mary Anne RileyA casual friend of Marys and Mandys at Saint Anthonys.
Tony RizzoA minor character, Tony is Mary's hair stylist.
Kristen SumnersOften confused with Kristin Erickson, Kristen also lives on a ranch (in Texas instead of Montana). She came to Saint Francis as a sophomore, previously attending the ultrastrict Saint Annes Convent School.
Jennifer (Jen) TaylorThe exact of Brittney Daniels, Jen is Britts best friend and a role model (the positive kind) for Mary Catherine. She takes over for Victoria Lancaster as Marys SA in the middle of her freshman year of school.
Sidney ValentineA casual friend of Marys and Mandys at Saint Anthonys.
Patrick (Whit) WhitneyMary Catherines older brother and Andys best friend. He died of leukemia when Mary was eight, just before he wouldve graduated from Saint Sebastians.
Susan WilsonOne of Mary Catherines Trio of Terror, Susan was originally on Veronicas floor in Benning Hall and moved to Marys midyear. Mary nicknamed her slugger after a memorable incident.