I'm pretty sure Dark Matter on it's own and Parasitic Slime (not the Slime Carriers) don't have fanart, apart from that I'm out of ideas
huh. Do Kitsune-bis also have fanart?
The Ant Arachne have barely any Fan Art, in the past some mamono didn't have fan art at all, but it's probably no longer the case.
shame as well, she’s cute as all hell.