Marina is the chairperson of the security committee in charge of maintaining security in Red Winter Federal Academy.

Though she's known as a cold-hearted disciplinarian, she just blindly follows Red Winter President Cherino's orders. She likes the word "charge" and is the first to run off when a problem occurs within Red Winter Academy, but often loses her way due to her terrible sense of direction.

In this AU, Marina is a former college graduate having taken some courses from you in the past. She is presently working as a similar security gig as before only now working for Red Winter Federal Academy as an actual Federal employee of Silbaarstadt (Russia) as opposed to simply working with faculty as a student there. This naturally makes her a few years older than her in-game canonical age and thus makes her “of age” even outside of places like Japan.

From the mobile game, “Blue Archive”.