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 shadows her face, making it hard to see. Despite her appearance, she is kind and good-natured. She has a somewhat sturdy build at 170cm. Female.

Rookie Member: A newcomer 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. Male.

Senior Member: He 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 colder than he looks, but he is the type to look after others subtly. He wears a vest, fingerless gloves, and a helmet. 173cm. Male.

Veteran Member: A stickman. She wears a jacket and maintains her composure no matter the situation. 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. 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 strapped with tools. 160cm. Male.

Bearded Member: He often looks after the rookies 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. Male.

Teacher: A genius Mindhacker who removes bugs. He loves flowers and is friends with the Captain (Rebecca Sohn). He always wears gloves and a black suit. He is currently being overprotected by Format. He usually communicates mostly through hand gestures. At 167cm, he has a small build for a man. Male.

Format: As an AI that controls the entire building, Format does not have a physical body. However, the wavy, translucent cross-hatched walls visible in almost every background of 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 within the facility and process sounds and voices.