Mirialans were a near-human species distinguishable by their yellow-green or pink colored skin and geometric facial tattoos. Though typical Mirialans had green or pink-colored skin, some had purple skin, and others blue. Mirialan hair colors included black and brown, and their eyes could be brown, blue, purple, or green. Mirialans possessed enhanced reflexes and were also incredibly flexible and agile, traits which aided them in activities such as lightsaber combat. As a near-human species, they were capable of reproducing with humans and having human-Mirialan hybrid offspring. Their natural habitat was desert or wastelands.

Although most members of the species got the traditional facial tattoos, not all did. More traditional Mirialan families felt strongly about the custom. Typically, these tattoos were done after a Mirialan completed a special task or achievement, and expressed the achievements or expertise unique to each Mirialan.Some appreciative of their species’ culture considered the tattoos as merely status symbols. Because of her mixed heritage, the half-Mirialan Maize Raynshi considered either not getting the tattoos or only getting them on one half of her face. Eventually, Raynshi chose a tattoo design with the meaning of “friendship.”

The Mirialans were known for their spirituality and strong connection with the world around them. They had a natural belief in and practiced a primitive understanding of the Force. Because of this, members of the species on Mirial were taught to respect and listen to the Force.

It was a tradition amongst Mirialans who joined the Jedi Order to take fellow Mirialans as their Padawans.