#4: Yasuo Yamada
It may seem silly to highlight a voice talent who's known for playing one particular role, but when this particular VA's performance in the role is so iconic, and has spanned decades in that role, it's perfectly appropriate to me. Especially when the character he's known for playing is a favorite anime character: Arsène Lupin III
How do I describe Yasuo Yamada's Lupin voice? It's hard, because his Lupin adapts to the tone of the feature. The first television series had a bit of a darker tone to it than the rest of the franchise, much like the manga it was spawned from, until later episodes. Lupin's voice changed subtly throughout the show, but Yamada always played him cooly but with a bit of playfulness.