Which Looney Tunes character constantly chases the Road Runner?

In 'Futurama', what is the name of the delivery company? In 'Futurama', what is the name of the alcoholic robot? Which Looney Tunes character's catchphrase is "What's up, Doc?" Which Looney Tunes character ends cartoons saying "Th-th-th-that's all, folks!"? Which company does Wile E. Coyote buy his gadgets from? In 'Peanuts' TV specials, what is the name of Charlie Brown's dog? In 'A Charlie Brown Christmas', what kind of Christmas tree does Charlie Brown choose? In 'Dexter's Laboratory', what is the name of Dexter's annoying sister?