Feral

Characters that are usually drawn on all fours. That doesn't mean they have a feral mind

ADDITIONAL EDIT ( 5/26/23 )
Due to the Joycawn stuff (bulletin here, twitter thread here)
Porn of these characters is strictly not allowed due to their feral body stature. Intelligence/awareness and body are two distinct factors that both need to be humanoid to make porn ok. Characters listed here main refs are not humanoid, and therefore not allowed for NSFW art.