I have been transferring a lot of older characters over to the community site and many of them were made in previous versions of Unity and the usual issue is that transparency turns to solid white. You will see eyes go white and you may see cubes mounted on the body that are supposed to be invisible.
PLEASE! Feel free to tell me about this. I am working on fixing them but it's a bit slow because they are old projects and not always named like the character.
Thanks and enjoy!