 He is conservative in appearance, dressed in an ordinary gray/blue two-piece business suit.The book "" states that his appearance in "Half-Life 2" is based on Frank Sheldon.The G-Man speaks in a slow, raspy yet commanding manner, with a certain accentuated low-key moroseness to his tone, sometimes placing unusual stress on syllables, stressing the wrong parts of words, making unneeded pauses, inhaling sharply and audibly throughout his speech, and awkwardly changing the pitch of his voice, sometimes in the middle of a word.