Well in most cases to none I will be keeping my character, in other instances I had a feeling my character may not be possible but honestly we have elites from Halo, humans, and more floating around. So please know my character won't be the end of the world to exist. I enjoy the look and strength of a Chaos librarian for their magic but not their body. A pariah is useful against Psykers and without a soul I just free float in the warp.