
Aya Furukawa as Janine Kishi, the smart but distant older sister of Claudia who does have a soft side In season 2, she comes out as lesbian.
Claudia and Mimi have a special relationship. Takayo Fischer as Mimi Yamamoto, Claudia's grandmother.Analia Vonshmakuka as Jessi Ramsey (guest Season 1, starring season 2).Vivian Watson as Mallory Pike (recurring Season 1, starring season 2).She is Hispanic-American and her mother used to go to school with Mary Anne's father, Richard Spier. Xochitl Gomez (season 1) and Kyndra Sanchez (season 2) as Dawn Schafer, Mary Anne's new friend who recently moved to Stoneybrook from Los Angeles and the alternate officer of the club.Kristy dislikes him at first, but later in the show, she grows accustomed to him.
Mark Feuerstein as Watson Brewer, Elizabeth's wealthy fiancé and later husband. Alicia Silverstone as Elizabeth Thomas-Brewer, Kristy's divorced mother. She lost her mother when she was 18 months old and has a very overprotective father. She is known in season 1 as the "baby" of the club. She is portrayed as biracial in the 2020 series. Malia Baker as Mary Anne Spier, the shy secretary of the club and Kristy's best friend. Shay Rudolph as Stacey McGill, the treasurer of the club who is from Upper West Side of Manhattan. She is Japanese American, but never learned to speak Japanese. She hides candy around her room, which is the meeting place for the club. Momona Tamada as Claudia Kishi, the popular vice president of the club who has a passion for any type of art, but she frequently struggles in her studies. Sophie Grace as Kristy Thomas, the president of the club, she is a vocal individual, frequently sharing her opinion about feminism as well as other social troubles. The babysitter part 3 series#
The series follows the friendship and adventures of five middle-schoolers as they start a babysitting business in Stoneybrook, Connecticut.