|Age||8,then 9,10 (Mazinger), 10, then 11 (Great Mazinger), 11,then 12 (Grendizer)|
|Family and Relations||Unknown|
Shiro has dark brown hair and black eyes. He usually wears a green shirt and black shorts.
Shiro is a lively young boy with lots of energy. He is loving and caring. But he is mischievous and hotheaded.
Shiro was born to Kenzo and an unnamed mother. His parents died in a lab accident. He just turned 8 at the start of the series and was about to turn 10 when Mazinger ended.
After Juzo gave Koji the Mazinger, and the fight with Dr. Hell started.