Gibert Gottfried, I recall did Digit (Parrot from Cyber Chase), the AFLAC duck, and Mister Mxyzptlk from the Superman Animated Series.
The voice of Mr. Krabs from Spongebob is also Lex Luthor from the Superman Animated Series.
Andy Morris, who voiced Cicero from Skyrim, also voiced Tachyon from Ratchet & Clank.
H. Jon Benjamin, (Carl from Family Guy) is also Bob from Bob's Burgers and Archer from Archer.