The money waiter is completely made of money. He has a bow tie and double arch "hair."
The money waiter appears when Mr. Krabs moves him over to the table that Mr. Krabs and Mrs. Greenback are at. Mr. Krabs voices the waiter and he "takes" their orders. When Mr. Krabs moves the waiter away, Mr. Krabs feels bad that he is not going to give the waiter a tip.