Ashido

I am going to post the basic application in a moment, but I would like to know if I could add a shikai to Ashido's abilities since it wasn't addressed in the anime. He is centuries old as described in bleach but he never uses his shikai and with a shinigami that old we all know that he has one. So I would like to add a fitting shikai that would go along with what we've seen from him in the anime/manga.

Yes you may.