As some of you know, I am REALLY into video games only to direct thanks to my brother. I got into one franchise called Mass Effect. Anyways, here you have it. You're a leader, you have to save the galaxy and you make your own choices (RPG) whether they are good or bad. They have consequences.
They also have a number of species; aliens that are known throughout the game and one of them is called quarian. They are known to be closely resembling humans but you don't get to see until that "supposed" last installment. They are in these suits and helmets because they have low tolerance/ immune systems.