FrankenNorn is a Norn that I spliced from one I got off the internet (who by the way had a bit of every norn, grendel, and ettin in her, or so claimed the text file with her) and one of my Feral Run norns.  He is normal in most respect except that he has no gonads.  And he has a tendency to sit and look at nothing.  If you splice him with the Norns in your world it'll be perfectly viable.