Karen Wheeler, portrayed by Cara Buono, is a main character in Stranger Things. She is the loving but somewhat clueless mother of Nancy, Mike, and Holly, and the wife of Ted.
In 1983, after her son's friend, Will Byers, goes missing, Karen enforces strict rules that no one goes out late. This causes friction between her children, particularly Nancy. She remains largely unaware of the events around her, especially her son keeping an escaped experiment in her basement and her daughter searching for a monster from another dimension. When a group of agents arrive at their house telling her and her husband that his son and friends might be hiding the experiment, Karen becomes extremely distraught. She eventually tearfully reunites with Mike at the local middle school and goes to the hospital where Will has been recovered.
Martine S. Rousseau is an alias used by a key Samaritan operative. Her mandate was to eliminate threats to Samaritan's survival. Speaking with a British accent, Martine is first seen at the Hajdú Budapest Hotel in Hungary, meeting with a journalist who has lost his job. The man shares his theory that an operation was designed to target companies developing artificial intelligence, believing his situation was the result. Martine initially pretends to be unaware of artificial intelligence's existence, but then begins acknowledging the man's situation, frightening him by listing subsequent events set to happen as they speak as they do. Pulling a gun, she informs the man that two other people are set to die in a traffic accident in Seattle within fourteen minutes. She then shoots him and leaves.
Dr. Faye Miller is a strategist for a consumer-research company. The company she works for pitched its consulting services to Sterling Cooper Draper Pryce. At a kickoff meeting Faye asked senior staffers to complete a very personal questionnaire that asks for family history, at which Don abruptly excused himself from the presentation. ("Christmas Comes But Once a Year")
Once hired, Faye brought all of the young, unmarried secretaries into a focus group for Ponds Cold Cream, pretending to be a young single girl to make them feel more comfortable with spilling their secrets. The girls chat about beauty routines while Peggy and the men observe from the other side of a two-way mirror. When the conversation turns to men and rejection, the women break down into tears. ("The Rejected")
Kelli Lombardo Moltisanti is the wife of former Capo Christopher Moltisanti. She started dating Christopher after the death of Adriana La Cerva. When she discovers she is pregnant, she is scared of this, as her family frowns on out-of-wedlock pregnancies. However, Christopher is overjoyed at this (due to the presumed barrenness of Adriana) and says he will marry her to make it official. Sometime after the wedding she gives birth to their only child, a baby girl they named Caitlyn.