User blog comment:FrankieX98/The future members of the Issei's harem and peerage./@comment-2601:584:C400:82A0:C861:CFB9:7C8:845C-20181206200804/@comment-2208155-20181206203240

Rose is a valkirie(demi goddess), maybe in certain way we can add her in the goddess category, like we count the reincarnated angels as angels... Akeno is half-fallen angel and koneko(nekomata)&kunou(kitsune) are youkais)..

With one of each specie is enough(For Issei harem current number of members) if you want the future characters receive enough relevance..