TV-Series
Description
Designated U-1146, this neutrophil bears an identification number mirroring his immune system role. His appearance includes extremely pale skin, white hair covering one eye, and black, dull eyes—consistent neutrophil traits. He dons a standard white uniform often stained with post-combat cytoplasm, reflecting his violent duties.

During routine patrols, U-1146 maintains a reserved, aloof demeanor. Combat triggers an aggressive, ruthless shift when eliminating pathogens or infected cells. Despite this ferocity, he exhibits kindness and selflessness, prioritizing protection of all fellow cells regardless of type or status. He forges positive bonds, including a protective relationship with Red Blood Cell AE3803, whom he nicknames "Cell Boy." With Platelets, he interacts gently, offering assistance when needed. He shows respect for adversaries, exemplified by listening to a Cancer Cell's final words before termination. Unintentional humor surfaces in actions like casually greeting colleagues mid-combat. The spin-off *Cells at Work! WHITE* expands his persona to include a "big brother" role within his neutrophil team while retaining his detached exterior.

Originating in the bone marrow, U-1146 trained as a myelocyte. During this period, he rescued a young AE3803 from a *Pseudomonas aeruginosa* attack, enduring the bacterium's assaults until reinforcements arrived. Both cells expressed hope to reunite as mature cells before parting, though chances seemed slim. After becoming a full neutrophil, he patrolled the bloodstream and tissues to eradicate pathogens. He frequently encountered the adult AE3803 during missions but initially failed to recognize her.

His abilities center on pathogen elimination and immune defense. As a neutrophil, he displays exceptional agility and strength, dispatching common bacteria with single knife strikes. Key skills include phagocytosis for analyzing or neutralizing foreign cells, proficiency in close-quarters and ranged knife combat, and threat detection via a receptor hat. Additional capabilities encompass L-Selectin adhesion for surface adherence, free movement as a wandering cell, and transmigration through tissues for rapid deployment. He participates in large-scale defenses, including battles against leukemia cells amid chemotherapy-altered environments.

U-1146's development involves confronting occupational mortality. He retrieves the cap of fallen neutrophil U-9696, delivering it to a Hair Matrix Cell boy as a memento. An early pilot chapter (*The Story of Cells*) featured a non-canonical conceptual iteration: designated U-1116, this macrophage possessed a less dedicated work ethic and operated under a reincarnation-based lifespan system.

Though not explicitly defined, U-1146's lifespan aligns with short-lived neutrophils, underscored by his discovery of U-9696's cap and the pilot's themes of cell death and renewal. His narrative consistently highlights unwavering dedication to protecting the body against evolving physiological threats.