Catherine Frensky

Catherine Frensky is Francine's high school-age sister. It was said that Catherine is in Grade 10 in the episode Vomitrocious. She was originally voiced by Patricia Rodriguez who also originally did the voice of Sue Ellen, and is currently voiced by Alexina Cowan.

Appearance
Catherine is described as brown monkey with long red hair. She usually wears a blue shirt jacket, yellow shirt, and blue pants. She made her debut in the segment Francine Frensky, Superstar, and has appeared in subsequent segments as well.

Personality
Catherine is probably the exact opposite of Francine. She is described as girly and very responsible. Like sisters Francine and Catherine go thorough various fights like how to decorate their room in Francine Redecorates and who gets the last soda. She briefly wore lipstick in one scene of My Dad, the Garbage Man, and nail polish in one scene of Stolen Bike, but usually prefers to keep it natural. But Catherine can help her sister see what's wrong like in episode Citizen Frensky when she took pictures of her to make her feel what it's like to be made fun of. She also tried to help Francine after she learned that Francine unknowingly plagiarized an entire paper for her Thanksgiving report in "Francine's Pilfered Paper".