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.

One of the four members of Arius Squad.

She is student of the Red Winter Federal Academy, and head of the Public Work Department. Minori will send workers to any place where manpower is needed, such as large-scale civil engineering and construction projects, and direct them on-site. Although good at her job, Minori seems to be infamous with her employers for going on strikes and demonstrations over trivial matters...

Head of the Public Works Department at Red Winter.

According to Seia, she is a person with quite the unpalatable sense of humor, hence why the Treaty of Eden is called the way it's called. According to Yuuka, she is tends to be quite irresponsible judging by her tone when she described the president during Kivotos's "sorry state." According to Rin however, she is a good friend of hers.

The GSC president has long sky-blue hair that's violet on the inner side, long bangs that cover her left eye, and a loose braid tied on her left side.

President of the General Student Council

She is a fanatic of old noir movies and has a yearning for the cool situations and lines in the movies, and often gets hurt when she tries to say the lines...

Mina is the executive director of the student council "Xuanlong Office" and the bodyguard of the student council president. 

Mina, student from Shanhaijing Senior 2nd School.

She is a talkative person, rarely particularly paying much mind to the current mood or flow of the conversation. She likes to interject her own, unfiltered thoughts into the current conversation

She is not particularly bright and can be viewed as a happy-go-lucky type of person. Even in serious situations, she often acts in a carefree manner

She is the childhood friend of Nagisa, and also friendly with Seia

She is fan of roll cake

She uses a white Lanchester MK.1 rifle called "Quis ut Deus"