* Adorable is already a very positive adjective, meaning "extremely cute or charming." It's not usually used in a comparative or superlative sense.
* More adorable is grammatically correct, but it sounds a bit awkward.
* Most adorable is also grammatically correct, but again, it's not often used because "adorable" already carries a strong meaning of being extremely cute.
Instead of using "more adorable" or "most adorable," consider these alternatives:
* More charming
* More delightful
* Cutest
* Most charming
* Most delightful
These alternatives provide a more natural and varied way to express different levels of cuteness.