Quarian

The Quarians are a nomadic species of humanoid aliens. Quarians are generally shorter and of slighter build than Humans. They dress in a scavenged assortment of materials, hiding their faces behind visors, goggles, or breathing masks. It is possible the Quarians are cybernetic, a blend of machine and biology that can survive for a time in the vacuum of space. It is also possible the Quarians are simply so accustomed to living on their substandard, makeshift ships that they never remove their survival suits.

Approximately three hundred years ago the Quarians created the Geth, a species of rudimentary artificial intelligence, to serve as an efficient source of manual labor. However, the Geth rebelled against their Quarian masters and drove them into exile. Now the Quarians wander the galaxy in a flotilla of salvaged ships, secondhand vessels, and recycled technology. Other species tend to look down on the Quarians, seeing them as scavengers and condemning them for unleashing a dangerous synthetic life form on the rest of the galaxy.