Merlin the Magic Mouse was a nightclub magician (he usually preferred to be called a prestidigator, though he could never pronounce this correctly) who traveled around for work. Much of the humour of the character derived from the fact that, while he was often regarded as a cheap stage magician, he knew some very real and powerful magic tricks. His magic words were typically "Atascadero Escondido!" Merlin also has a sidekick, appropriately named Second Banana, which is a slang term for a magician's assistant.
Merlin is loosely based on W. C. Fields.