Unpopular opinion perhaps but paissa definitely creep me out. Something about them is distinctly Seussian (the face, probably) but their limited animations make them super disturbing.

Beyond that, the Ahriman models and Avere's flying head are hella freaky. The one with the weirdest childhood-gone-wrong vibe would be Number from Eureka Anemos. As for critters I prefer to actively avoid despite being able to waste them in a few hits, morbols are at the top of the list.

(Can I note here that 'ground squirrels' and the angry chinchillas randomly living in Coerthas Central Highlands are all aardvarks?! wtf)