The man is at a Quackboard table (a game like roulette but played with dice and a checker board.) When he is talking to the dealer from time to time, he is speaking Cygnaran with a Khardic accent. His clothes and hair styles look local, although he is obviously of Khard stock.
(Note that although Midlunders and Morridane are by far the most common ethnic types in Corvis, it is a metropolis and attracts folk from all over the Iron Kingdoms.)
He is wearing bulky, well-made clothing which could conceal a number of weapons, and even light armor. From his general appearance you would guess that he has some money, although he certainly does not dress ostentatiously, and his clothes are not the latest Caspian fashion. He carries a leather satchel on his shoulders, which seems to have some unidentifiable items in it. Looking at his hands you can tell that he is no stranger to outdoor work, although judging from his general cleanliness he has not been sleeping in the outdoors lately, or at least has had some time to clean up.
(Sense Motive check): From his manner you can tell that he has the air of practiced nonchalance about him (i.e. he is a professional at this.)