@Unlucky Well I was talking about the ogre guys in the meat plant in particular, and they *are* literal oni of Elevenland's lore (鬼)
Actually "oni" also includes vampires and ghouls because incidentally in moonrune their names contain the word 鬼
"Ghoul"'s is 屍鬼 (Shiki-literally corpse demon, remember that Shiki manga? Exactly). Kabane's namesake is very likely from 屍 (Shikabane) too
My rusty moonrune tells me in this part Inugami was talking about "tribes/clans with the word "oni" attached to their name", it was translated as "species with "demon" attribute"
"Vampire" is 吸血鬼 (Kyuuketsuki-literally bloodsucking demon)
The furigana for 吸血鬼 here is "Mihai-san" though.
Kek.