He's both. Japanese people sometimes tend not to differentiate between the two. We are all the same to them -- foreigners. Black, white, whatever. When I was teaching near Nagoya, I literally had the lady who worked at the corner convenience store (which I visited daily) get confused between myself and a co-worker from Gambia. When I pointed out her mistake, she got all flustered and muttered something. Whatever.
Anyhow, I always thought of Duck as both. Sometimes he is one, sometimes the other. Since they don't care, neither do I.