Whatever, you know what I mean. As a Greek, even if he has darker skin than one would expect, he's still of a caucasian race. Want another example? Darth Vader, was voiced by a black actor, and did a damn good job if it (please don't come up with another reaching argument like his suit is black or something). The idea that only white people should voice white characters, and that only black people should voice black characters is ridiculous, silly, and archaic. Animated shows are full of black characters voiced by white people too.
It is voice acting. The voice actor's skin color and ethnicity has nothing to do, and never should have anything to do, with their right to voice any character. You can't see them, you can only hear them. Only thing that matters is the performance they're able to pull off with their voices.