The word that sprang to mind, when rreading through the first couple of posts of this thread, was cuprosanguine. Someone with "the wrong" blood type could be called acuprosanguine

Assuming that the main purpose of the blood, in the WiP, is to carry oxygen to the body cells, then the cuprosangoids would have green blood, which would also affect their complexion, I guess. I believe they would have a greenish skin tone, rather than the pinkish tones of the ferrosangoids, making them immediately obvious - which might spoil the plot a little?

BTW, I have a feeling that copper oxides are toxic: not that that matters, as the natural selction inherent in successful mutation would have dealt with that problem. [apologies to my creationist readers]

I'm immortal until proven otherwise