One of the concepts I developed for Cosgrove Hall (post Dangermouse and Duckula) involved three little penguins as the earthly, but unwilling, servants of Beelzebub. One of the penguins was a Harpo-type character, who only spoke in tweets and honks, whereas the other two spoke normally. The penguins decide that the Devil is a horrible man who they don't want to work for, so they abscond to live as bikers Hell's Penguins, much to the Devil's fury, and he pursues them.
It was felt that the Devil aspect, with open mentions of Hell would render the series unsaleable in the US, so we kept the Hell imagery but substituted the Devil for The Chairman.
With even more concessions, Hell's Penguins became Avenger Penguins and eventually the penguins became idiotic but golden-hearted bikers, pursued by an evil entity for no apparent reason. No wonder it didn't garner much of a following.