Physical changes are possible. It can be done with a sub, even a weak one but it can be done with pure intention/LOA too.
There was a guy researching LOA with subliminal and through many tests from this community (including me) we observed many physical changes, with a few being completely mind-blowing. However, once we stopped the subliminals, we lost the effects as well. We though it was in our head, but that wouldn’t explain people noticing the results as well: in most case, we noticed results only because our relative/friends pointed out the differences.
On one hand physical changes via subliminals doesn’t seem an impossible feat to me. The subc controls your physical functions, and science has proven many, many times that the mind influences DNA. It is therefore 100% possible to undergo physical changes with pure intention/LOA and thus subliminal. However I think trying to become an anime character is a stretch and a bit foolish because of the time it’d need to morph…
As for why most advanced sub vendors on the market right now don’t propose such subs, I suspect it’s because it’s hard to miss physical changes, and therefor easy to blame the sub for lack of results if nothing changes. I think most big vendors are afraid of that.