He is based. He is a mysterious and enigmatic character that appears in nearly every title of the Half-Life series. He always has a calm and almost uninterested demeanour. He has a mysterious and omniscient personality. He has peculiar behaviour and can wield reality-bending powers. His real name and age are unknown. His motives remain unexplained. He wears a grey-blue business suit. He is immortal. He has short black hair styled in a crew cut and pale green eyes. He carried his black briefcase.