Favorite Monster (Humanoid/Natural/Fey)
I’m going to extrapolate that “natural” is meant to cover magical beasts, beasts, and monstrosities (depending on which flavor of D&D is your favorite at present) and call this for the owlbear.
At the conceptual level — half bear, half giant owl — the owlbear is quite possibly the most nonsensical straight-up predator ever created. However, its backstory captures an important facet of the essential nature of the game — mad wizards experimenting in dark towers are constantly doing weird shit, and that weird shit will eventually try to kill you.
(Archive post from the personal blog.)