Kaneto Shiozawa
was a Spanish member of the powerful Assassins Guild that allowed himself to become the host of a symbiotic creature named in exchange for his sight. Because of this, Zato-1 was able to take control of his shadow, and use it as a weapon to gain great power. With this power, he made himself leader of the Assassins Guild. However, as his body weakened, Eddie was able to take control until Zato-1's death at the hands of Millia Rage. While his body was taken by Eddie from "Guilty Gear XX" onward, after the death of his voice actor Kaneto Shiozawa, Zato-1 was resurrected by the Conclave as part of their experiment and serving them until he is defeated by Faust. He later returns to the Assassins Guild and played a role in its reformation into a legit intelligence organization.