There are alot of Voice Actor who only do one character in the Transformers universe like Lenord Nemoy (Movie Galvatron) but others like Peter Cullen and Frank Welker did the voices for large majoritys of the cast.
For some reason I'm thinking if you counted up every Transformer character a voice actor did and ordered them by number of characters Frank would be at the top of the list.
Off the top of my head I can name Megatron, Series Galvatron, and Unfortunatly Wheelie as Frank Welker but I know that doesn't even really scratch the surface.
Basically think of it this way, if Hasbro desided to do an Aniversery series of single episodes, each one featuring a single Voice Actor and every character from Transformers he/she's ever voiced what episode would have the most characters in it?
-=edit=-
Oh yeah, just in case I'm not perfectly clear, we're only counting their credits in the Transformers (This does include human characters) series. We're not counting ALL their characters from other shows so no listing Fred from Scooby Doo under Frank Welker. He did do Fred's voice but Fred was never on Transformers.
