Sal was a stereotypical versoin of the underpaid worker.Sal wore a read baseball cap he was unshaven and usually wore a sweat stained tank top it also seems that he is either an insomiac or is sleeped deprived because of the enormous bags under his eyes
Sal was sarcastic rude and was usually seen messing around on the job. That must be why he has a new job in every episode he has appeared in
Importance to the series
Sal had a minor role in the series the only episode he had an actual imprtance to was parasites lost where he was harassing Leela he was a very but very important character.