Japanese ? Stacking Bowls

Not finding any marks but I would think Japanese? Some Manga/Anime characters?

 

AWWWWWW........so you could rotate them and mis-match the bodies!!!!! Would the little bird be a signature?????

 

I think the "B" on each of them is the maker. Super cool,Id have bought them.

 

You can stack them the way you want. I am trying to search for something similar but no luck so far. I wonder if those are actual characters or made up.