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Kari McKeen is a 14-year-old babysitter. She is a best friend of Violet, who hires her to watch Jack-Jack when Violet and Dash decide to tag along with their mother. The enthusiastic Kari speaks through "a mouthful of orthodontia," and considers herself an expert on how to deal with babies, such as playing Mozart to increase their intelligence. Helen is not entirely confident about a teenage girl watching over her infant son, as she prefers a full-grown adult to do that job instead (which ultimately does happen, but with far worse results than Kari's oversight of Jack-Jack).

Despite her training and optimism, Kari is unprepared to deal with Jack-Jack's emerging powers, and leaves increasingly frantic phone messages with Helen, before Syndrome steps in and introduces himself as a more experienced "replacement sitter". Kari is clearly unaware of Syndrome's checkered criminal past; only asking him why he wears a big "S", to which Syndrome calmly responds that it stands for "Sitter". Kari's ordeal remains off-screen in the film, but serves as the focus of the short film Jack-Jack Attack. She is last seen being interrogated by National Supers Agency government agent Rick Dicker, who asks if she has told anyone about the ordeal. Kari explains that her parents thought she was joking and wishes to forget the whole ordeal, to which Dicker promises that she will as he activates a device to erase her memory of the incident.

Her surname is only mentioned in the screenplay and in Jack-Jack Attack.

A deleted opening for The Incredibles 2 would have seen Bob and Helen visiting the McKeen residence to try and figure out what actually happened the night she babysitted Jack-Jack, only to learn she has no recollection of the night, despite winking at Helen at one point. Although the scene was a favorite of Brad Bird, it was removed because it did not really add anything to the story they were trying to tell.