No, but I asked a few friends
Apparently it was planned but never added (bc Mojang doesn't give us what we want)

Wtf is the aether

More female leads would be cool ngl, tired of only male leads (maybe do a gender picking at the beginning of the game)
Also, yes more animal leads will be perfect

Here is the problem with it: if it was designs only, people would be fine with it, mostly. Since Nintendo didn't sue for that but patent mechanics, it becomes so much more complicated

Same with games like Sims, with all the expansions that should have been in the base game