Board Thread:General Discussion/@comment-32502867-20170713220646/@comment-25155763-20170714191936

Orpheus's case is just Rick's mistake. If he wan't to follow that orpheus is a son of Apollo, he shouldn't have called him a demigod. And if he wanted Orpheus to be half-mortal, he should've said son of Calliope. He 'played both sides' of the myth.

In any other case however

If they turn out human, they are demigods. Demigod is any being with one godly parent. It literally means half-god. The other parent could be either a nymph or mortal. Technically, you could call them demi-nymph, but why make things complicated?

If they turn out non-human, females are nymphs and males are either spirits or  in some monsters,usually due to unusual circumstances(rape/non-con,bestiality,etc).