Kosoko was created by me as a companion slash Partner for my Kazumi <w<
He actually was only the third Tsubera ever created, as my boyfriend at the time wanted one as well.

Tsubera are a species that I came up with to avoid the Question "So, what species is your Fursona?" :')

The Tsubera live in the world of Necierra, that I'm in the process of creating right now
(this will probably take a LONG time though...)

This reference was made by Kwik on FA!
Link to their Profile: https://www.furaffinity.net/user/kwik