Shizuka Jonouchi (城之内静香 Jōnouchi Shizuka) is a character in the Toei Yu-Gi-Oh! anime. This is the series incarnation of Shizuka Kawai. Shizuka is the brother of Katsuya Jonouchi. Following their parents separation, Shizuka lived with their mother, while Katsuya lived with their father. Shizuka is ill, spending a lot of time in the hospital. Unlike the manga, she uses the same surname as her brother, rather than her mother's maiden name.