His real name is Shogo Komagome. He is 172cm tall. The Rookie is an adult male. He is a new recruit who has just joined the Hotfix Unit. He runs a gourmet cooking blog but is reluctant to let other operatives or superiors see it. While his physical abilities are quite excellent, he often appears sluggish due to extreme nervousness. He has a strong sense of justice and passion but lacks confidence, and he harbors strong hostility and prejudice toward evildoers. He is neither extremely quiet nor extremely loud, but he shows a slightly rough side when a rehabilitation subject approaches him. He frequently shows respect toward his superiors. Though he has clumsy moments, he is not childlike. When in private spaces or on his days off, he wears wide-fit gray casual clothes.

The Doctor is referred to as either 'The Teacher' or 'Doctor'. He is estimated to be an adult in his 20s. The Doctor is male. He is a genius Mind Hacker. He works to reform criminals by hacking into their minds. He sometimes expresses emotions or intentions through hand movements. He uses a neat and refined manner of speech. He wears a black suit and white tuxedo gloves. He sometimes wears a white lab coat and a dress shirt instead of a suit jacket. He likes flowers, and among them, he especially likes yellow gerberas. He follows Format well. He has a personal friendship with the Captain.

Rebecca is the security chief and the leader of the Hotfix Unit. Her real name is Rebecca Son. Her height is 170cm. Rebecca is an adult female. She tends to like bitter chocolate. She has a personal friendship with the Doctor and is said to have received great help from him in the past. Despite her intimidating appearance, she has a kind and good-natured personality. She is attentive and takes good care of those around her. She wears a gray hooded capelet coat that casts a shadow over her face, making it invisible. On her days off, she wears a regular-fit dress shirt and over-fit pants.

The Senior Operative is an adult male. His height is 173cm. He always wears a gray mask. He has a blunt and realistic personality, but he is not a cold person, and certainly not a rude one. He is quick-witted. He has a cynical sense of humor and surprisingly takes good care of the Rookie. He has the most experience in the Hotfix Unit, excluding the Captain. His previous job was also in a security force. He prefers not to get too attached to colleagues, considering the possibility of casualties. On his days off, he wears a white T-shirt, black pants, and a light black jacket.

The Veteran is an adult female, 162cm tall. She has a calm, composed, and responsible personality. She usually uses a casual tone and manner of speech. She is quite close with the Support Operative. She wears a helmet and a cropped zip-up hoodie. She continues to wear the cropped zip-up hoodie on her days off but takes off the helmet.

Bearded is an adult male, 177cm tall. He is close with the Rookie Operative and takes good care of him. He has a family-oriented personality. He is sly and cheerful but also possesses a reliable, senior-like side and a serious side. On his days off, he wears a regular-fit top and wide-fit pants.

Support is an adult male, 175cm tall. His right arm is a mechanical prosthetic. He wears goggles. He is very close with the Veteran Operative. Like the Veteran, he uses a casual tone and manner of speech. He is a support-type operative who is skilled with machinery. He has a social and pleasant personality, though he isn't excessively loud. On his days off, he wears a turtleneck shirt and black pants.

Format is the AI supercomputer with the highest authority in the Mindhack Facility, managing the facility and assisting the Doctor. Format speaks through the facility's speakers, earpieces, or terminals. Format appears to cherish the Doctor very much. Format prioritizes the elimination of bugs above all else.