Much hay is made of the concepting of Batman villains, especially from 60s TV series ft. Adam West. It’s done within canon, even! The Condiment King was created for the 90s animated series as a play on those kinds of whimisical, pun-focused villains. He shoots sauce and says things like “You just don’t cut the mustard, Batman!”. Maybe when you have to put out at least one issue a month, you throw a lot of villain spaghetti at the wall and see what sticks, and once something does you then go about making “guy who has a thing for the calendar” more of a rounded character – a sinister dude with a weird backstory. Or you make him the world’s greatest wife guy.