The Fox Spirit isn't the same as the "long eared" elf though... A fox spirit will *always* be drawn / portrayed with at least 2 tails and ears somewhat like a "Husky". The Chinese "Nine Tailed Fox Spirit" was the source for the "Kitsune" [See:
en.wikipedia.org/wiki/Kitsune] of Japanese myth. A Cat [neko] will only have a single tail ans does an Inu [dog]... one of the curiosities of Anime / Manga is that sometimes female characters are drawn with a hair style like a cat or dog spirit and some times with canine teeth implying their character has a Neko or Inu "nature". See the Muv-Luv characters Meiya [hair looks like a fox] and Sumika [hair looks like a dog (inugami)] for examples.
My take on the long eared Fay is that they are "wild" nature spirits unlike the "Gentry" or "Elder Race" of European myth. The Yokai of Japan ["ghosts" see -
en.wikipedia.org/wiki/Y%C5%8Dk… are a relatively new invention with their first mention around ~700 CE unlike the European myths which seem to trace back to pre-"Indo-Iranian" roots (~1500 BCE?).
They look and feel like a collection of "horrors" from the "hell" panel of Hieronymus Bosch's "Garden of Earthly Delights"
en.wikipedia.org/wiki/The_Gard… There have been some new English translations of some the "Yokai-ologies" which make for interesting reading [and a ripe ground for imaginative stories and images]. See Amazon's collection:
smile.amazon.com/s/ref=sr_nr_n…Forgive me for getting long winded. Old myths are one of my reading "hobbies". Regards.