Physically, the G-Man appears to be a middle-aged Caucasian male with a tall, thin physique, pale skin, a prominent widow's peak, black hair shaped in a military-style crew cut, and pale green eyes(that glow in the dark).

he is seen dressed in a blue suit with a purple tie. He is almost always seen carrying a briefcase.

The G-Man speaks in a slow, raspy yet commanding manner, with a certain accentuated low-key moroseness to his tone, bordering on the cryptic. 