Catherine Frensky

Catherine Frensky is the older sister of Francine Frensky.

Physical appearance
Catherine is a monkey with a brown complexion. She has long dark auburn hair and bangs, with her long hair tied into a ponytail. She usually wears a blue denim vest, a cream-colored (originally white) turtleneck, and blue pants, usually with red leg warmers.

Personality
Catherine is almost the exact opposite of Francine: she likes wearing dresses, is 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 the episode "Francine Redecorates" and who gets the last soda; however, despite their arguments, they genuinely love each other. She briefly wore lipstick in one scene of "My Dad, the Garbage Man," nail polish in one scene of "Stolen Bike," and got a pedicure in "Muffy Gets Mature," but she usually prefers to keep her appearance natural. In "Is That Kosher?" her sleepwear is seen to be a blue nightgown.

Appearances
Season 1 Season 2 Season 3 Season 4 Season 5 Season 6 Season 7 Season 8 Season 9 Season 10 Season 11 Season 12 Season 13 Season 15 Season 16 Season 18 Season 21
 * Francine Frensky, Superstar (first appearance)
 * Meek for a Week
 * My Dad, the Garbage Man
 * Poor Muffy
 * Stolen Bike
 * Francine Frensky, Olympic Rider
 * Play it Again, D.W.
 * Arthur's TV-Free Week (mentioned)
 * Francine Redecorates
 * D.W.'s Name Game
 * Sue Ellen's Little Sister
 * Revenge of the Chip
 * Buster's Growing Grudge (mentioned)
 * Arthur's Almost Real Not Live Music Festival (cameo)
 * Francine and the Feline
 * Muffy's New Best Friend
 * The Blizzard (cameo)
 * Prunella Gets it Twice
 * To Beat or Not to Beat (fantasy)
 * What is that Thing?
 * The World Record (cameo) 50401
 * The Lousy Week (mentioned)
 * Francine Goes to War
 * Muffy Gets Mature
 * Citizen Frensky
 * Francine's Split Decision
 * Vomitrocious
 * Francine's Big Top Trouble
 * Feeling Flush
 * Francine's Pilfered Paper
 * Is That Kosher?
 * The Frensky Family Fiasco
 * Matchmaker, Match Breaker
 * The Great MacGrady
 * Cents-less (cameo)
 * Flippity Francine
 * Surprise!
 * Whip. Mix. Blend
 * Muffy Misses Out (mentioned)
 * The Master Builders

Friends
In "Muffy Gets Mature," some of her friends from High School are revealed, including Angi, Debi, and Tami. However, her friends have rarely appeared again since.

Trivia

 * According to "Vomitrocious", it is implied that Catherine is 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. She also celebrates her 16th birthday in Season 18, which coincides with this implication as well as most sophomores in High School would be 15 to 16 years old during the duration of the year.
 * 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" in other episodes.
 * She, like her family, is Jewish.
 * In Play it Again, D.W. and D.W.'s Name Game, she is the babysitter for Arthur and D.W.