Serenity Wheeler, known as Shizuka Kawai in the Japanese version, is Joey Wheeler's younger sister. The two were separated at a very young age when their parents got divorced. Serenity is depicted as being a sweet-natured, gentle, fragile and dependent young girl. She has a small fragile body, flowing auburn (brown/red) hair, and gentle green eyes. Throughout the whole series she is pictured as gentle but strong, with a never changing attitude of high spirits.