User blog comment:B214/Volume 22 spoilers/@comment-201.215.165.7-20170213165134/@comment-31137559-20170215055813

Not all pureblood devils are high-class devils.

Devil+Devil=Pureblood devil

Devil+Any other species that is not also a devil=Halfblood devil

Person made into devil with evil pieces=Reincarnated devil

No matter how you paint it they are all devils regardless of origin. We can agree to disagree and I know that a reincarnated devil isn't a pureblood devil. But two devils have children that child will be a pureblood devil regardless of his parent's origins. And those houses that went extinct because of them having children with other species. Now we are talking about other species that have been reincarnated as devils having children with other devils.

The problem is that I am not talking about the children's blood itself and am focused on how they will be seen by the society. I am just focused on the fact that Issei is a devil society-wise. While reincarnated devils do take on the aspects of devils, it doesn't make them devils physically. They are still the same species they were. But by the devils, Issei will be seen as a devil.

Consider this. A pureblood high-claas devil fills his peerage full of sexy powerful women. And they are all reincarnated devils. He decides to make them all his mistresses because he can only have pureblood high-class devils as wives. He has children with all of them. Now what would happen? Will the children be considered pureblood because their mothers are devils regardless of their origin? Or will they be considered half-bloods or reincarnated devils because of their mothers not being pureblood devils and thus not having devil blood?