- Gender: Female
- Age: Probably 16
- Hair: Black
- Eyes: Blue
- Nationality: Japanese
- From the manga Biobooster Armor Guyver, by Yoshiki Takaya
- First Appearance: Chapter 15
Shizu’s grandfather, Yohei Onuma, was the caretaker for Agito Makashima’s true father, before that man died and Agito was sold to an executive of Chronos. Something unpleasant seemed likely to befall the servants of the late master, but Agito intervened at least in the Onuma’s case, shielding them from the attention of Chronos. In return, they have often given Agito the use of their cottage near Mount Minakami as a base for his more covert operations.
Exactly when Shizu met Agito is unknown, but she has been a companion of his for at least several years now and obviously cares for him deeply. Perhaps a bit too deeply, as she tends to whitewash Agito’s flaws. She herself is a kind, almost timid person, but is possessed of a core of strength. If she must, she will fight or even sacrifice herself to protect her grandfather and the man she unrequitedly loves.
Shizu is a normal human. Though she has some unavoidable experience in subterfuge and fleeing for her life, she is otherwise about as capable as one would expect a normal teenage girl to be.