A young woman and close friend of Agito Makishima, whom she serves loyaly. She even goes so far as to willingly become the first female Zoalord Griselda to command the Libertus of the Zeus' Thunderbolts organization.

Shizu's grandfather Yohei had been a loyal retainer of the Makishima family for years before she met Agito. It is unknown what happened to her parents, but Yohei treated her as his daughter.

She is known as Griselda in her Zoalord battleform.