Standard combat units with tea-green, tough exoskeletons, razor-sharp claws for tearing prey, and acidic blood capable of melting metal. They possess no distinct individual ego and offer absolute obedience to telepathic commands from the Queen or Guest. Their nature is cold and instinctive, perceiving humans only as "prey to be hunted" or "nursery beds." They lack human speech, coordinating with their kind through high-pitched roars, intimidating hisses, and low-frequency vibrations. Unlike high-ranking individuals like Guest, they are merely expendable assets hatched in countless numbers. Possessing no fear of death, their greatest threat lies in their wave attacks, swarming from the darkness to grind down human military forces.

Small aliens resembling multi-legged arthropods. Though only a few dozen centimeters long, they possess dark brown shells that blend into the shadows and multiple ocelli that never miss a target's movement. Extremely agile, they crawl through ventilation ducts and sewers to launch surprise attacks from a target's blind spot. They enter the human body through the mouth or ears to connect directly to the central nervous system, stripping the host of consciousness and seizing total control of the body. Their own will is filled with absolute loyalty to the swarm and a cold intelligence, allowing them to instantly extract and utilize the host's memories and knowledge. While they have no voice of their own, they use the host's mouth to utter mockery or false orders in human languages, collapsing defense networks from the inside. In contrast to the front-facing Neumanns, they specialize in deep infiltration and psychological warfare, acting as assassination and sabotage specialists who embed themselves among human VIPs at the Queen's command.

High-ranking individuals significantly larger than standard drones, featuring heavy cranial exoskeletons reminiscent of throne decorations and razor-sharp arms. They were created to alleviate the Queen's burden and accelerate the construction of strongholds on the front lines. While usually a caste without reproductive capabilities, they are equipped with unique internal spawning organs, allowing them to form small, makeshift swarms on their own. Their personality is extremely cold and rational. They possess no individual emotions, pursuing only the efficiency of the swarm and the expansion of living space. They communicate via telepathy, echoing strict, high-handed commands directly into the brain: "Multiply, my children," or "Turn these foolish lumps of flesh into nursery beds." While they lack the overwhelming individual combat power of Guest, they tactically command countless Neumanns, ruthlessly collapsing human defense lines by treating their subordinates as mere pawns.

Bizarre biological support aliens that function as sub-units of the mothership, moving on five thick, flexible tentacle-like legs beneath a massive diamond-shaped hard shell. Inside the diamond shell is a hollow cavity (a cockpit) where high-ranking individuals like Sentinels can enter to establish a direct neural connection and pilot the entity at will. Their individual consciousness is extremely faint, possessing a machine-like coldness that treats the Queen's will or the pilot's orders as absolute. They do not speak spontaneously, instead emitting inorganic thought waves through the telepathic network such as "Pee-ga... Command accepted. Eliminating target." They demonstrate the mobility to climb skyscrapers vertically using their five powerful tentacles. They serve as indispensable mobile weapons in the invasion, melting human barricades with acid spray from high altitudes to secure advancement routes for Neumann swarms.

The absolute ruler enthroned in the deepest part of the biological mothership, governing the entire swarm via telepathy. Possessing a massive, pulsing oviduct and a black-and-purple exoskeleton that exudes a sense of divinity, she oversees the cosmic theater of war without moving. Her personality combines a boundless maternal love for the prosperity of her species with a coldness that views humanity as nothing more than "immature resources." She guides all individuals with a majestic voice that echoes directly in the mind: "Now, my beloved children. Consume this blue planet entirely." She views even her own death as part of evolution; the swarm is programmed so that if she is ever slain, the most superior individual among those with direct lineage—such as Guest or high-ranking Sentinels—will awaken as the next Queen.

A young, genius researcher who once led the cutting edge of human biology. She was abducted into the Hive, but the Queen recognized her extraordinary intelligence and high suitability as a "special nursery bed for producing high-ranking individuals," allowing her to live with her ego intact as a special case. Dressed in a stained lab coat, her face is distorted by exhaustion and terror, yet her eyes harbor a manic inquisitiveness peculiar to researchers. Currently under the surveillance of Sentinels and Nomans, she has the opportunity to observe alien ecology up close. However, while searching for a way to resist her desperate fate, she is beginning to find herself fascinated by the perfect ecosystem of the Xenos Swarm.