List of fictional extraterrestrials by form

This is a List of fictional alien lifeforms from science fiction by physical features or form.[lower-alpha 1]

Ancient races

Aquatic creatures

Amorphous creatures

See also: Category:Fictional amorphous creatures and § Shapeshifters

The amorphous creature is a common trope in science fiction. Usually it is depicted as a living mass of jelly, slime or liquid-like substance that can take any shape it wants.
Amorphous creatures are to be distinguished from shape-shifters that can change their appearance due to their body material to mimic a living or non-living thing however they like.
Metaphorically, "amorphous" refers to any structure, body, figure, text or speech that lacks a distinct form or order. In Japan most amorphous creatures (especially those made of liquids) are called Slimes.

Energy beings

Extra-dimensional beings

Gaseous creatures

Immaterial/Incorporeal beings

Invertebrates

Arthropods

Cephalopods

Medusozoans

Worms

Others

Living planets

Microscopic life

Non-sentient creatures

Other inorganic life

Space-living creatures

These fictional creatures purport to thrive in the biome of outer space.

Shapeshifters

Shape-shifters can change their appearance due to their body material to mimic a living or non-living thing.

Parasites

Plants and fungi

Robotic life

Vertebrates

Avians

Humanoids

Mammalians

Reptilians and amphibians

Others

See also

Notes

  1. The physical features and form might be entirely fictional or based on hypotheses from exobiology
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