Man, that half-blood trait/categorization list is extremely ambitious. I personally avoid creating settings where inter-species offspring are possible, but I like settings that attempt to explain what tends to happen when different races have children.
I have a real neurosis about settings that have half-races but don't exhaustively explain how it might work.
Wrote a short story for class. Didn't edit it at all. Bon appetit(if you try to read it while I format it good luck)