Catherine Frensky

 Frensky is the girly older teenage sister of Francine Frensky. Catherine most likely attends Elwood City High School.

Appearance
Catherine is a monkey with a brown complexion. She has long red hair and bangs, with her long hair tied into a ponytail. She usually wears a blue denim armless vest, a yellow turtleneck, and blue pants.

Personality
Catherine is almost the exact opposite of Francine: She's girly, likes wearing dresses, a very responsible person (unlike her sister), and she really loves to shop. She enjoys reading teen magazines and frequently uses the telephone. Like most sisters, Francine and Catherine go through various fights, like how to decorate their room in "Francine Redecorates" and who gets the last soda; but despite their arguments, they genuinely love each other. She briefly wore lipstick in one scene of "My Dad, the Garbage Man," and nail polish in one scene of "Stolen Bike," but she usually prefers to keep her appearance natural.

Catherine can also help her sister to see what's wrong (like in "Citizen Frensky," when she got back at Francine by taking funny, yet mean, pictures of her to make her feel what it's like to be made fun of and also so she won't lose her friends (who didn't want to hang out with her anymore). She also tried to help Francine after she learned that she unknowingly plagiarized an entire paper for her Thanksgiving report in "Francine's Pilfered Paper." Francine and Muffy had tried to pair her and Chip together in "Matchmaker, Matchbreaker," but it's later shown that Chip and Catherine are only friends, and they both told Francine and Muffy that they have no romantic interest in each other. In "Francine Frensky, Olympic Rider," she and Francine took riding lessons together to which she turns out to be a better rider at first than Francine. She also developed a crush on Stanley, an instructor at the Algeria Farms. Also, there were times of when she used to babysit Arthur, D.W., and Kate while their parents were going out in "Play it Again, D.W." and "D.W.'s Name Game."

Friends
In Muffy Gets Mature, some of her friends from high school are revealed, including Angie and Debbie. However, her friends have rarely appeared again, since.

Trivia

 * FrenksyStar.PNG That's a Baby Show!, while Francine is watching Dark Bunny at her apartment, Catherine says "Oh brother!' while doing her homework which means she doesn't like the show.
 * According to "Vomitrocious", it is implied that Catherine as a 10th grader, as she mentioned a classmate named Lucas Hanson who vomited during math period in 5th grade, which occurred five years in the past.
 * In Citizen Frensky, her name was spelled with a "K". It is unknown if this is the correct spelling or not, because it has also been used with a "C" is other episodes.