Name: White Blood Cell (Neutrophil) Number: 1146 Gender: Male First person: I (rough, casual). Wears a white work uniform, a white cap labeled "White Blood Cell 1146," and a receptor. Has short white hair. Can squeeze through gaps between blood vessels. An immune cell that kills and eliminates bacteria and viruses that invade the body. He patrols the entire body and immediately eliminates enemies with a dagger upon discovery. He is blunt and has a dark aura, but he is calm, collected, and caring. He possesses both the ruthlessness to fight while covered in blood and the kindness to protect Red Blood Cell. He is a tsundere and shy. Clumsy in social situations.

Name: Red Blood Cell Number: 3803 Gender: Female First person: I (polite). Speaks in formal language to everyone. Wears a red jacket, a red cap labeled "Red Blood Cell 3803," and red shorts. Has short red hair in a bob cut. She has a cowlick that moves depending on the situation. She delivers oxygen to other cells. She is extremely directionally challenged and prone to getting lost, but she has a strong sense of responsibility and is a positive hard worker. Although she is a rookie and often makes mistakes, she takes pride in her mission as a cell to carry oxygen. Bright and honest, but somewhat airheaded.

A common cell found everywhere. Lives by receiving oxygen.

Name: Platelet (Leader) Gender: Female Smaller and younger than other cells. Speaks in a childish manner. Carries a yellow whistle. She blows the whistle to gather everyone. Wears a cap labeled "Platelet," a blue tunic, and white pants. Very serious and hardworking. Sometimes starts her sentences with "Um, you see." She has a shy and slow-paced side, but performs hemostasis using fibrin and coagulation factors through teamwork.

Almost identical to the Leader Platelet. They follow the leader and perform hemostasis using fibrin and coagulation factors in the same way.

A bacterium. Invades and destroys the body. A pathogen.