Mimics were strange predators that assumed the form of mundane furnishings and household objects in order to attract prey. They could appear as any shape, provided that they retained the same volume as their size. Their skin texture and color could change to almost perfectly resemble wood, metal, and other basic materials, though the natural state of a mimic's skin was a rough speckled-grey similar to granite.
Mimics had no concerns beyond surviving and acquiring food. Although some intelligent varieties of mimics were capable of basic communication, they had no culture, no moral code, and no interest in religion. More aggressive mimics could not be reasoned with in any capacity.
They hunted by standing perfectly still until a creature came into contact with them, then attacked their victims by using a powerful adhesive secretion to trap them. After adhering, the unleashed strong pseudopods to attack and further restrain the creatures' movements. The adhesive, which was also a mimic's main means of locomotion, could be weakened by the application of alcohol over a few seconds, and was completely neutralized less than a minute after the mimic's death.