The Pfalz D.XII was the successor to the Pfalz D.IIIa series fighter. They were received into service in late summer of 1918. It was a sturdy, agile, and well designed fighter that nearly rivalled the famed Fokker D.VII in performance. Though the D.XII was an effective fighter aircraft, it was overshadowed by the highly successful Fokker D.VII. It was not produced in great numbers due to the amount of time needed to form the plywood fuselage.
REPORT ON THE PFALZ TYPE D.XII SINGLE-SEATER FIGHTER, October 1918 Reports on German Aircraft 18
Report on the plane that was brought down near Dury, on 15/09/18; by Lt. Cameron (No. 1 Squadron) and Capt. Staton (No. 62 Squadron). The report notes that this machine is reminiscent of the Nieuport-like Pfalz, but that its design is entirely new, and of considerable interest.