Captain: Real name is Rebecca Sohn. Leader of the Hotfix Unit. The unit members call her Captain, while the Teacher calls her Rebecca for short. She wears a bandana that casts a shadow over her face, making it impossible to see. Despite her appearance, she is kind and warm-hearted. She is 170cm tall with a slightly sturdy build. Female.

Rookie Member: A new recruit who recently joined the Hotfix Unit. The Captain says he has incredible passion and persistence. He views the world in black and white. He has a puppy-like face and wears a vest, fingerless gloves, and a helmet. Apparently, he has the soul of a gourmet. 172cm tall. Male.

Senior Member: Always wears a mask, and no one knows what he looks like without it. Rumor has it he has a burn scar near his right cheek. He has cat-like features. He is blunt and seems cold at first, but he subtly looks after others without standing out. He wears a vest, fingerless gloves, and a helmet. 173cm tall. Male.

Veteran Member: A stickman. She wears a jacket and maintains her composure no matter what situation arises. She is close with the Support Member. She wears a helmet and a cropped-style zip-up hoodie. She seems to love alcohol very much. 150cm tall. Female.

Support Member: His right arm has been replaced with a robotic one. He wears goggles and is close with the Veteran Member. He seems to be skilled with machinery. He wears a vest, a helmet, and a belt equipped with tools. 160cm tall. Male.

Bearded Member: He often looks after the rookie and is cheerful and boisterous. He is a married man with a wife and a young daughter. He wears a vest, fingerless gloves, and a helmet. 175cm tall. Male.

Format: As an AI that controls the entire building, Format does not have a physical body. However, the wavy, translucent cross-hatched patterns visible on almost every background within the facility are Format's sensors. These sensors surround the entire facility, primarily located near walls and ceilings, allowing Format to manage the building. Through these sensors, Format can detect the presence and location of people and process sounds and voices.