Katherine Mulligan is a minor character in The Loud House.
In "Butterfly Effect", she reported all sorts of activity that had been going on with Lincoln's sisters after the events that led to the family falling apart. She asked Lisa for comments about them, and Lisa reveals that she knows about them because they're her sisters, and lastly, she asks where it all went wrong. Flip tried to stop the interview when she questioned why he hired Lisa to work at his gas station, but not before endorsing his products. However this was all Lincoln's fantasy, so this never happened.
She appears again in "Out on a Limo", where she wants to interview Lincoln for riding in his limo. She asks him how he got to be so important, and Lincoln didn't know how to answer that since he only won the limo for a day in a mustard jar contest. She later reports about his downfall after he loses the limo where Lincoln admits that he thought he was more important than everyone else only to reveal he was just a kid who ate a bunch of mustard. He asked for a ride home, but the reporter denied it and drove away.
She also appears in "The Loudest Yard", where she wants to talk to Lincoln about his latest play, but since all this time it was really Lynn secretly playing in his stead, he just made up a comment about it being in the past and him being about the future. The coach of the Royal Woods Roosters wanted her to get her cameraman to shoot some poses of him.
Katherine has long dark brown hair tied into a ponytail, a yellow headband, and white earrings. She wears a yellow coat and matching skirt, a white shirt with a black necktie and yellow cuff links, and black high-heeled shoes.
Katherine speaks and behaves like a stereotypical news reporter, even when she is off camera. She is always on the hunt for information and any news that she can broadcast, and is very sneaky due to her profession. She interviews people about their situations, but doesn't show any sympathy if they suffer. Her attitude annoys both interviewees and coworkers alike.