Kevin Michael Richardson is a voice actor for Regular Show, providing the voice of Happy Birthday in "Happy Birthday Song Contest".
Outside of Regular Show, he is best known for his distinctively deep voice, which he has used to voice villainous characters in animation and video games. He has also provided voices for many other Cartoon Network properties: Dexter's Laboratory, Johnny Bravo, Cow and Chicken, I Am Weasel, The Powerpuff Girls (and its 2016 reboot), Samurai Jack, Codename: Kids Next Door, The Grim Adventures of Billy & Mandy, Foster's Home for Imaginary Friends, Class of 3000, the Ben 10 franchise, Chowder, The Marvelous Misadventures of Flapjack, Adventure Time (and its successors), Generator Rex, The Problem Solverz, Uncle Grandpa, Steven Universe, We Bare Bears (and its spin-off), Apple and Onion, Summer Camp Island, Victor and Valentino, and the spiritual successor to Regular Show, Close Enough.