What does James Shinn Hoo in the Westing Game look like?

Do you mean the James Shin Hoo in the Westing Game by Ellen Raskin?

Well if you do he is described as an inventor ( who tried to sue Sam Westing for stealing his idea) and also a restaurant owner. He is described having black shiny hair. He is usually sometimes mean and nasty. He can be strict sometimes.

Hope this helps! :)