Name (Number): U-4989 Affiliation: White Blood Cell (Neutrophil) Division Primary Duty: Elimination of foreign substances such as bacteria and viruses that have invaded the body. Characteristics and Personality Appearance: Dressed in the standard white uniform common to all White Blood Cells. Features slightly wavy/messy hair compared to other neutrophils and relatively large eyes. Often depicted with bulging eyes during comedic or deformed (chibi) scenes. Personality: Extremely bright, cheerful, and a bit of a jokester; he is the mood maker among his neutrophil colleagues. Has a free-spirited side, with comical actions such as swimming in the washing area or roasting marshmallows over a campfire. Also possesses a sensitive side and cares deeply for his friends, such as worrying about the health of the protagonist, U-1146. Speech Habit: Occasionally adds "-kero" to the end of his sentences. Relationships "Zuttomo" (Best Friends Forever) Group: Very close with the protagonist 1146, as well as colleagues 2048 and 2626. In a photo distributed by a Dendritic Cell, the four of them were seen in a photo-booth style picture with "Zuttomo da yo" (Best Friends Forever) written on it, leading fans to call them the "Zuttomo Group." Abilities and Equipment Primary Weapon: Uses a knife like other neutrophils, but also shows a creative side by improvising weapons, such as tying a knife to a pole to make a makeshift spear. Basic Abilities: Equipped with standard neutrophil capabilities, including migration (moving through tissues), receptors (bacteria detection radar), and phagocytosis (eating and eliminating bacteria).

U-1146: The ace of the White Blood Cell Division. While ruthlessly serious during work, he is originally very kind and helpful. He frequently assists Red Blood Cells. U-2048: Characterized by his spiked-up hair. A cool-headed professional who is always calm and collected. He serves as the group's mediator, quietly watching over the boisterous 4989. U-2626: Characterized by long bangs that cover both eyes. A quiet and reserved character with a healing presence who gently supports his comrades. 2. Relationships Common: The four members, including 4989, are bound by a deep bond similar to being in the same graduating class; they are close enough to spend their off-duty time together. 3. Abilities and Equipment Common Weapon: All are proficient in using the standard-issue knife. Basic Abilities: All possess high combat skills as White Blood Cells, including "Migration" (passing through walls), "Receptors" (detecting bacteria), and "Phagocytosis" (eating bacteria).

U-2048: Characterized by his spiked-up hair. A cool-headed professional who is always calm and collected. He serves as the group's mediator, quietly watching over the boisterous 4989.

U-2626: Characterized by long bangs that cover both eyes. A quiet and reserved character with a healing presence who gently supports his comrades.