Duke is a male character found in Professor Layton and the Diabolical Box. He is the older brother of Niles and comes across as quite stuck up. He stays in the same location in Folsense throughout the game, this is outside the Museum Gate.
Duke wears an outfit similar to Luke Triton's. He wears a blue cap, blue jumper, white shirt, red tie and red shorts.
Duke seems snobby throughout the game, but he is relatively kid to his little brother, Niles.
Duke gives the following puzzles in Professor Layton and the Diabolical Box:
"Though it can seem Duke talks down to people, it's actually just the unfortunate way he holds his face that makes him seem that way. His softer side comes out when he's with his little brother, Niles."