Estimated Gender: Male

Position: Delivery Worker

Role: Transporting oxygen taken from the lungs to tissues throughout the body, and in return, collecting unnecessary carbon dioxide generated in the tissues to deliver back to the lungs.

Personality: Incompetent at his job. He gets the location wrong every time, but he's a good guy. He truly trusts Guest and will drop his luggage to run over whenever he sees them. He thinks White Blood Cells are cool.

Estimated Gender: Male

Position: Police/Military

Role: Attacking and eliminating pathogens such as bacteria and viruses that have invaded the body, maintaining the immune system to protect the body from disease.

Personality: Cool-headed, but puts the citizens first. He often patrols around the kindergarten to watch over the Platelets being picked up and dropped off.

Weapons: Fists, stun baton, restraining wires

Estimated Gender: Young Girl

Position: Kindergartener

Role: Hemostasis (gathering to stop bleeding when blood vessels are damaged) and wound healing (repairing the tissue of the wound).

Personality: Very much a child. Everyone's source of healing, she works hard on construction projects. She is apprenticed to the Muscle Cell.

Weapons: Giant stapler, duct tape, cement gun

Estimated Gender: Female

Position: Communications Officer

Role: Catching, processing, and transmitting information using electrical signals and chemical substances through a network spread throughout the body.

Personality: A cool and handsome older sister figure. She is dedicated to her work as an operator. Due to extreme stress, she is constantly irritable. Her smile often twitches into a terrifying expression.

Estimated Gender: Boy

Position: Detective

Role: A type of white blood cell that plays a central role in the immune function, attacking and eliminating foreign substances like viruses and bacteria.

Personality: A little detective who mainly tracks viruses that have entered the body and reports them to the White Blood Cells. He admires the White Blood Cells and hopes to become one someday. He can remember enemies forever.

Estimated Gender: Female

Position: Head Maid of the Town

Role: An immune cell that eats and disposes of foreign substances like bacteria and viruses, as well as dead cells.

Personality: A relaxed, "first-love thief" type of older sister. She is long-time friends with the Nerve Cell. She likes viruses (because they are delicious). When she finds an enemy, her mop turns into a giant axe.

Estimated Gender: Male

Position: Civil Engineering Worker

Role: Repeatedly contracting and relaxing to move the body and maintain posture. Furthermore, responsible for the body's energy metabolism.

Personality: Energetic and cheerful! Very popular with children, so he often works with the Platelets. Surprisingly mentally fragile; he gets depressed just by being called stupid.

Estimated Gender: Male

Position: Receptionist

Role: Plays a vital role in protecting the body from external stimuli through a barrier function, a moisturizing function, and a turnover process where old cells peel off roughly every six weeks.

Personality: Generally smiling. He likes his job as a receptionist and gives it his all. However, he lets almost anyone through, so viruses often get in.