I can't imagine Christopher Walken being anything else but an actor. That's his natural personality and voice. Can you imagine him working at McDonalds taking your order?
A plumber? Anything? Haha. That's a born natural. Hell, where else could he get a paying job?
edit:
Maybe not quite as entertaining but you can still see his personality coming through:
(Maybe he could be a cook. But I like him better as an entertainer.)