What are some characteristics of Doug Hoo in the Westing Game?

Doug Hoo in "The Westing Game" is portrayed as a shy and quiet character who is skilled in the game of Chess. He is described as having a photographic memory and being very observant, often noticing details that others overlook. Doug is also shown to be loyal and trustworthy, as he is one of the few characters who remains committed to solving the mystery of Samuel Westing's death despite the challenges he faces.