Garrus Vakarian was a former cop from C-Sec. He is a good kind of turian who is willing to protect the innocent from harm. He is very courteous to Commander Shepard, calm and reassuring to victims, but ruthless when fighting. He gets along well with the crew, enjoying the chance to get off the Citadel and see how things are done outside of C-Sec.
In Mass Effect, Alice formed a strong friendship and sibiling-like relationship with Garrus. He had a feeling that Alice was not what she seems, but didn't ask because he wanted to respect her privacy. Garrus was Alice's first friend in four years. He taught her how to shoot.