A posh incubus from a prestigious demon family, Donathan is the Netherworld ambassador for the Earth Defense Force. Alongside his own skills with defensive firearms and shadow manipulation, Don is able to pilot fighter jets (such as his own jet, the "DaiOuJou") with incredible expertise.

Don's a charismatic sort, and takes great pride in his work ethic and sense of duty among the EDF, though he can come across as rather arrogant as a result. His sense of professionalism has put him at odds with the more free-spirited angel Teriel, his fellow ambassador and rival pilot.