So, i've been wondering, does hisahiko consider these elves, or perhaps some other fantasy creature. If they are elves, they have unique looking ears, and it makes me wonder the idea/reason behind it.

They are a humanoid species that evolved from aardvarks. Hence the ears and the termite-based diet. Hisahiko created them because he recalls his earlier incarnation as an aardvark and wants to share his experiences from that time.

Ryouji said:
So, i've been wondering, does hisahiko consider these elves, or perhaps some other fantasy creature. If they are elves, they have unique looking ears, and it makes me wonder the idea/reason behind it.

The name of the series on Pixiv is エルフのおなご ("Elven Ladies").