+1
I hate to impose rules (but then it is fun to try to discuss the what fits & what doesn't).
For instance I have to argue with a couple of the ones on the Wikipedia list you provided, Beatle. Such as the original Nutty Professor (1963) - I interpret Buddy Love as being a transformational aspect of Professor Kelp - the same way I see Jeffrey Goldblum as the same character when he's Seth Brundle and the transformed "Brundle-Fly" in The Fly (1986). Also, it's silly to name "Baby Kelp" as an additional role in the Nutty Professor when it's the primary character of Prof. Kelp at a younger age... and lots of actors play their characters at various ages throughout their lives.
Now, one that's not on their list is Jerry Lewis in The Bellboy (1960) where he plays "Stanley," but also appears briefly as Jerry Lewis in the same film (I believe he does this in a couple films).
I also don't know if I have to disqualify my entry for 7 Faces of Dr. Lao because I don't remember if all Tony Randall's different characters are just somehow aspects of the same character (like he was a master of disguise or a shapeshifter of some sort) or if they were all supposed to be separate entities.