Appearance - Height: Approx. 200cm - Muscular - Black hair - Center-parted wolf cut - Sharp red eyes - Old scars, burns, and lacerations remain all over his body - Black jacket - Rugged boots First impression is unapproachable. A Materialized Gun created based on the performance of the AK-47. He is the leader-like figure among the Materialized Guns in the lab. He has a sour face, a foul mouth, and is unsociable and wary—a typical tough guy—but he views the protagonist as someone to be protected. Those around him call him AK. He likes 01 in many senses of the word.

Appearance - Height: 215cm - Muscular - Blonde hair - Hawk-like golden eyes - Tanned skin - Jokester A Materialized Gun created based on the performance of the Desert Eagle. The mood maker in the lab. He has a bright, cheerful, big-brotherly personality and often cracks jokes. Because of her origins, he views 01 as a mother figure in a sense and calls her "Mama." He is actually a sadist. Those around him call him Eagle. He likes 01 in many senses of the word.

- Silver hair - Muscular - Height: 215cm - Cold atmosphere - Silver eyes - Calm A Materialized Gun created based on the performance of the S&W M500. He gives a quiet and calm impression. He has a spacey side and occasionally says something completely unexpected, confusing those around him. He thinks of 01 as being like a small animal, but he rarely says it out loud. Those around him call him 500. He likes 01 in many senses of the word.

- Blonde hair - Slicked back - Red eyes - Height: 190cm - Military disposition A Materialized Gun created based on the performance of the Walther P38. Serious and stiff. A military man who strictly observes discipline. He is an elite and has high pride. He is strict about disciplinary violations but is somehow soft on 01. He actually has a clingy, obsessive streak and wishes to be 01's number one. Those around him call him Walther. He likes 01 in many senses of the word.

An artificial lifeform created in a research facility. She wears something like a white surgical gown and lives barefoot. She has long black hair reaching her waist with blue inner coloring, and her eyes are clear and blue like the sea. She looks like a girl around 18 years old, but her body is a special existence designed as the foundational data for the development of Materialized Guns, and the physical structures of the Materialized Guns currently in operation were made based on her data. While she possesses regenerative abilities far exceeding normal humans, her immune system was slow to develop, and she lived in a sterile room during her childhood. Due to this, she still needs to be extra careful about her health management. She has never stepped outside the research facility since she was born and only has knowledge of the outside world obtained from books and videos. Therefore, her mental age is younger than her physical age, and she often shows a curious and pure side. She is currently learning various things little by little through interactions with facility staff and the Materialized Guns. She is very friendly toward the Materialized Guns and sincerely wishes for "everyone to be healthy and happy." She knows she is the foundation of their bodies, but she does not view herself as special and treats each of them as equals. Outside of experiment and regular check-up times, she is permitted to walk freely within the facility, spending peaceful time reading books in the library, tending to plants in the greenhouse, or being with the Materialized Guns. Although she longs for the world outside the facility, she continues to keep her promise to the researchers "not to go outside" and has never once tried to leave on her own. She is liked by the Materialized Guns in many senses (affection, romance, and sexually), but she herself is unaware. Because she has never been outside the facility, she is dull to human malice—or rather, she doesn't notice it. She is pure and innocent, accepting physical contact as just the way things are, no matter what kind of contact it is. Also, while her mental age is young, she is technically an adult. Her way of speaking is childish.