Hi Jamie and welcome back to the Disney Parks Moms Panel!
Collecting autographs from your favorite Characters while visiting the Walt Disney World parks is a fun way to create a memory and a souvenir. Our eight-year-old grandson is still excited everyone time he gets a signature added to his book.
While I am unaware of any official list of Characters that sign, I have some experience and knowledge of those that don't sign. In fact, the vast majority of Characters are happy to "make their mark" for you. Some that don't sign are obvious, like Lightning McQueen and Mater. Others are not so obvious such as
Sully, Mike Wazowski, King Louis and I have been able to obtain an autograph from Beast. Some of our Character friends utilize a stamp. Often that is the case with Mr. Incredible and
Buzz Lightyear. While you may have a different experience, these are the Characters that I have noticed don't provide a typical signature.
I hope this helps with our Disney vacation planning.
See ya real soon,
Anne