Hakkekkyuu U-1146

Оригінальне ім’я: 白血球 U-1146番

He is a White Blood Cell, specifically a Neutrophil, working under the Neutrophil Division. Along with the other neutrophil comrades, he's tasked to patrol around the Blood Vessel and remove any invading Foreign Substances such as Germs and Viruses. (Source: Cells at Work Wikia)