6. Zach Galifianakis
Zach Galifianakis has voiced two characters on Bob's Burgers - Chet, from season 3, episode 9, "God Rest Ye Merry Gentle-Mannequins," and Mr. Fischoeder's neurotic younger brother, Felix.
Felix first appeared in season 4's "Ambergris," when Mr. Fischoeder brings him in to help fix Bob with the plumbing in his restaurant.
Galifianakis is both a stand-up comedian and actor. He's perhaps best known for playing hilarious yet almost child-like characters, such as Alan in The Hangover trilogy and Ethan in Due Date. He has also lent his voice to The Simpsons as well.
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