The Greys are the most recognizable non-human entities in modern UFO mythology. They are usually described as small humanoid beings with oversized heads, smooth grey skin, thin bodies and large black almond-shaped eyes. In popular abduction narratives, they appear as silent operators, medical examiners or biological technicians.

Mantids are among the strangest beings reported in modern alien encounter lore. They are described as tall, insectoid intelligences resembling praying mantises. Unlike Greys, they are often portrayed not as workers, but as supervisors, surgeons, observers or telepathic coordinators.

Reptilians are one of the most controversial entity types in UFO and conspiracy mythology. They are usually described as intelligent reptile-like humanoids associated with control, secrecy, ancient bloodlines and shapeshifting.

Human-like, luminous and often described as beautiful or spiritually advanced, Nordics and Pleiadians appear in contactee stories as guides, teachers and protectors warning humanity about war, technology and ecological destruction.

The Tall Whites are a niche but memorable entity type associated mainly with stories of secret contact in desert military areas. They are described as very tall, pale, thin and technologically advanced. Their lore is closely connected with U.S. military secrecy, Nellis Air Force Base, Indian Springs and desert test ranges.

Hybrids occupy the disturbing center of abduction mythology. They are described as part-human, part-non-human beings created through genetic programs, reproductive experiments or long-term contact between humans and alien intelligences.

The Black-Eyed Children, also known as Black-Eyed Kids or BEKs, are one of the most unsettling figures in modern paranormal and UFO-adjacent folklore. They are usually described as children or teenagers with pale skin, calm voices and completely black eyes — with no visible whites, irises or pupils.

In ancient astronaut theories, the Anunnaki are interpreted not as gods, but as advanced beings who influenced early civilization. Their mythology connects Sumerian texts, lost knowledge, human origins and controversial claims about genetic intervention.

Not all theories describe visitors from distant planets. Some researchers and experiencers interpret UFO entities as interdimensional beings — intelligences that may enter our reality through altered states, portals, consciousness or unknown physics.

The Abyssal Watchers are a speculative entity type connected to reports of unidentified submerged objects, underwater lights, transmedium craft and deep-sea bases. In oceanic UFO lore, they are imagined not as visitors from above, but as intelligences hidden beneath the surface — observing humanity from the unexplored depths.

The Ningen are pale, giant aquatic humanoids from modern Japanese internet folklore, usually associated with Antarctic or sub-Antarctic waters. Described as enormous white human-like forms beneath the ice, they occupy the border between cryptid legend, deep-sea horror and oceanic non-human intelligence mythology.

The Cephalids are one of the most unusual non-human entity concepts in the archive. Unlike Greys, Mantids or other humanoid beings, they are imagined as radically non-human intelligences — tentacled, fluid, adaptive and shaped by the deep sea rather than by the stars alone.

Men in Black occupy the boundary between UFO folklore, government secrecy and paranormal horror. They are usually described as strange visitors who appear after UFO sightings, question or threaten witnesses, confiscate evidence and warn people not to speak.