I have a LOT of ideas about, no matter how boring it may sound, Eddie's nationality. Of course, he could be of any NON-existing nation, because there can really be a lot of strange creatures in Nita (well, as there are). Considering that Edward is not entirely human, we can say that he is of mixed ethnicity. I like to imagine that he has an emphasis on some letters, which is unlikely. So, either he is of human nationality
For example, British or American or Italian
Wikipedia said that in London, at the time of the 19th century, the majority were “whites,” that is, Europeans. So it can be assumed that Edward is British based on the location.