Also known as: 川井静香
Alternate names: Shizuka Jonouchi, Serenity Wheeler (English dub)
Sister of Jonouchi Katsuya in Yu-Gi-Oh! Duel Monsters.
She was separated from Jonouchi when their parents divorced and her mother took custody of her. When Shizuka was diagnosed with blindness, Jonouchi entered the Duelist Kingdom tournament to win the prize money needed for the operation that would save her eyesight.