Two of my favorite characters in the game appear here - Sonny Fletcher and Wanda Peck.
First of all, Sonny was a VERY memorable character for numerous reasons, most notably the fact that he's human and flawed, which is an EXTREMELY rare character in ANY video game, not to mention how dynamic the character is. You see Sonny later in the game, and your reaction parallels Tex's. And Henry Darrow's skillful performance etches Sonny even more clearly in the player's mind.
And Wanda, played awesomely ice cool by Monique Lanier, who also portrayed a fabulously snobbishly bitchy Countess Renier in an earlier Tex Murphy game, Under A Killing Moon, STILL remains my favorite character to interrogate. Something about the combination of her stunning looks plus her cool portrayal plus that amazingly sexy voice makes her my first choice whenever I find a new interrogation topic. Not to mention, she provides some of Tex's best leads in the game. But my hat's off to Monique for making Wanda Peck really stand out.