I think this is a good reason for any designer to use minor and/or obscure characters because you can change them into what you want without breaking the more established characters.
That was part of my motivation to search through Golden Age Comics looking for obscure villains that look interesting but don't have a mountain of history beneath them. The copyrights have expired and the characters only appeared in one or two issues. I'm guessing the "Green Mummy" story was something that Jack Binder drew in about one week 75 years ago.
The Puzzler (Nedor) comes with fewer expectations for behavior than the Riddler (DC) despite having an almost identical modus operandi. The Puzzler appeared six months after the Riddler, never had his secret identity named, and was caught by the Black Terror and sent to jail on the last page of the only story he ever appeared in. I guess the Black Terror is just a more effective super hero than Batman. That other guy's villains never seem to stay in jail for long.