Guess who is the game where you have to determine which person is selected from a deck of cards by asking the right questions. Today I ran across a website that listed all of the different characteristics of these cards and how often they were available in the game. It turns out that Paul only has Hair color and "Glasses" as a distinct feature, making him one of the hardest characters to call out.
"Does your person have a man made item on their face/head (Hat, Glasses, Jewelry, Bow)?" is the perfect question to ask in the game, becuase that eliminates at least 11 characters.
See this article for more Guess Who details: How to Win Guess Who Within Six Turns