Savage Mass Effect
A race of four-eyed bipeds native to the world of Khar'shan, the batarians are a disreputable species that chose to isolate itself from the rest of the galaxy. The Terminus Systems are infested with batarian pirate gangs and slaving rings, fueling the stereotype of the batarian thug. It should be noted that these criminals do not represent average citizens, who are forbidden to leave batarian space by their omnipresent and paranoid government. Despite several disagreements with the Citadel and simmering hostility toward humans, most batarians prefer profitable pursuits such as drug running and slave grabs to out-and-out warfare. They have a reputation for being shrewd businessmen and merchants, though in more lawless regions of the galaxy like Omega, negotiations with a batarian are likely to be conducted at gunpoint.
Batarians place an extremely high value on social caste and appearance, and overstepping one's place is frowned upon. Casting aspersions on the monetary worth of a social better is considered a serious insult. Batarians strongly believe that species with fewer than four eyes are less intelligent; they often gain the upper hand in interspecies arguments because other races find it difficult to know which eyes to focus on when speaking to them.
Slavery is an integral part of the batarian caste system, despite being illegal according to Council law, and it is currently unknown how the batarians maintained standing on the Citadel for so long with slavery still actively practiced. The custom is so deeply ingrained in batarian culture that batarians consider the Council's anti-slavery standing to be prejudicial. Rogue batarian slave rings are feared throughout the galaxy, especially among colonists.
Body language is an important part of batarian society. For example, tilting one's head to the left is a sign of admiration and respect. When a batarian tilts his head to the right it is a sign that he is (or considers himself to be) superior to the one that the gesture was directed at. Therefore, this gesture can also be interpreted as an insult.