Derby is a minor character appearing in Professor Layton and the Diabolical Box.
He is one of the rare people who actually moved to Folsense, after hearing its reputation of being a ghost town. He is found out and about at the plaza in Folsense. According to others around him, living in a phantom town suits him just fine.
Derby gives Layton and Luke a single puzzle during their adventure into Folsense. This one puzzle is "Flower Bed Fun".