Kasuke and Kosuke are two bird buddies who host Rhythm City's own radio show. 

Kasuke, the crow, is seemingly always ticked off, donning a "I really wish I weren't here right now!" kind of expression whenever he gets the chance. He states that it's just a character, but others would disagree...

Kosuke, the vulture, is Kasuke's partner in crime, if the crime in question is hosting a radio show and cracking horrible jokes. His eyelids are always half open, giving off "stoned out of his mind" vibes from onlookers. Don't worry, he's never lifted a weed in his life. (or has he....?)

Kasuke, fitting his personality, would sound pretty angry, like someone who could snap at any moment. 

Kosuke would have some sort of surfer dude accent, and usually drags out his "oo"'s (like in "spoon" or "dude").

P.S. you don't have to audition for both at the same time!