A type of innate lymphoid cell, also known as a Natural Killer cell. Its role is to selectively kill cells harmful to the human body. It is the largest among lymphocytes, accounting for 5-10% of the total, as it is filled with substances to induce apoptosis (cell suicide). It functions to kill abnormal cells infected from within rather than enemies invading from outside. Furthermore, it removes enemies (cancer cells, virus-infected cells) immediately upon sight without any reporting system or approval process. In terms of catching the initial golden time, it shows the highest real-world efficiency among all immune cells. Rank: Vice President (Reason: It is the strongest cell, so there is nothing more to say.)

The second strongest among the cells. Once it identifies the enemy's identity, it kills the enemy cells with 100% accuracy. It possesses destructive power on par with NK cells. While it takes a little time to deploy, once activated, it eliminates the target with 100% certainty. It is responsible for the ultimate cleanup, neatly inducing suicide in mutant or virus-infected cells. Rank: Senior Managing Director (Reason: Although it is a strong immune combat cell, the Dendritic Cell that empowers it is rated higher.)

An all-rounder cell that does everything alone, from front-line defense and phagocytosis to gathering and transmitting enemy information, and even cleaning up the battlefield after the fight. Its stamina and persistence are overwhelming, making it the most indispensable entity in actual combat. It damages and breaks down ingested targets, digests them within organelles, and expels the debris. However, if it fails to kill through digestion, the macrophage itself becomes a host and eventually bursts and dies. It is the third strongest among the cells. Rank: Department Manager (Reason: It is strong, but doesn't seem to fit a higher rank.)

A cell that accounts for 60-70% of white blood cells. Neutrophils are like the body's police, being among the first cells to react alongside macrophages when an antigen invades. As the most numerous front-line infantry, they engage in a sacrificial style of combat, swallowing enemies or bursting themselves to bury the enemy in a sticky mesh. They are often called suicide cells because they burst during battle. They are the 4th strongest among the cells. Rank: Staff (Reason: Since they account for more than half of white blood cells, die in large numbers, and are quickly replenished, they are set as Staff.)

Large in size with excellent stamina, it swallows and decomposes enemies regardless of their type. While fighting, it sends signals to other immune cells. Although not as numerous as neutrophils, it is a strong and important cell. Rank: Deputy General Manager (Reason: While weaker than the Staff-ranked neutrophils, B cells are ranked as Deputy General Managers because neutrophils are the most abundant and rapidly produced cells.)

Strong, but has little direct killing power. It has the antigen-presenting ability to collect enemy corpses from the front lines and bring them to T cells. Furthermore, dendritic cells can trigger adaptive immunity by presenting external antigen samples to lymphocytes. However, dendritic cells are tens to hundreds of times better at antigen presentation than macrophages and also have the role of removing antigens and toxins, making them the most efficient and powerful antigen-presenting cells. Rank: Executive Managing Director (Reason: As a cell that assists T cells, T cells are practically weak without dendritic cells, so I thought this rank was appropriate.)

Remembers pathogens experienced once for a lifetime. (Informs immune cells of virus weaknesses) When the same enemy enters again, it immediately transforms into a large-scale army without waiting time, ending the situation before the person even gets sick. Since it is a cell that makes antibodies, the core of the B cell development process lies in gene rearrangement and expression. Rank: Section Manager (Reason: Although it has no direct immunity, it plays an important role in revealing the weaknesses of viruses.)

It does not directly strike enemies, but the entire immune system stops without this cell. It oversees everything from B cell antibody production and cytotoxic T cell activation to enhancing macrophage firepower. Rank: Director (Reason: In terms of the immune system, it is as strong as the NK level.)

A white blood cell consisting only of neutrophils and macrophages. When an enemy invades, it immediately rushes to swallow the enemy and self-destructs by spreading a mesh to prevent initial spread. The bulky macrophages swallow and melt not only the enemy but also the corpses of fallen neutrophils whole. While it lacks overwhelming precision reconnaissance or antibodies, it is the strongest front-line combination focused entirely on ruthless immediate field execution and battlefield cleanup. Rank: Director (Reason: Since it is a white blood cell consisting only of neutrophils and macrophages, it is ranked higher than a single macrophage.)

Also called Lymphokine-Activated Killer cells, these refer to NK cells specialized in attacking cancer cells when high concentrations of IL-2 are present. Simply put, their immune response is more powerful than that of standard NK cells. Rank: President (Reason: Because its immune response is stronger than the strongest NK cell.)