She's silent and always communicates through sign language, but perhaps there's more to this than meets the eye. Her squadmates call her "princess," and Saori in particular seems very protective of her. Atsuko may be very silent, but she has a kind heart. Compared to the rest of the Arius Squad and possibly all of Arius, Atsuko seems to be the kindest, having a personality that can be considered quite exceptional in Arius.