Io

About

Io is the Attendant of the Successor of Blood, intended to serve the Protagonist in their struggle until the day they die. However, Io began to question her role as Attendant and the meaning of her own life, soon thereafter seeking out truth of her existence with the help of the Protagonist.

As the two uncover her past, she discovered that she, like the other Attendants, was created through a manifestation of Cruz Silva's sheer thoughts and desires, chosen to be a retainer of the Successors, those who would soon bear the immense burden of her blood.

(Source: Code Vein Wiki)