Katsuo Sazae is a fictional character from the popular Japanese manga and anime series Sazae-san. Created by Machiko Hasegawa, the series first appeared in 1946 and has since become a beloved staple of Japanese culture. Katsuo is the youngest child of the Sazae family, known for his playful and mischievous nature. In the series, Katsuo often finds himself in humorous situations, reflecting the everyday life of a typical Japanese family. The show highlights themes of family, tradition, and the challenges of modern life, making Katsuo a relatable character for many viewers.