That's only because anyone who put their villains in a costume as flamboyant as Papillon's WOULD be blatantly ripping him off. Except Araki. He's been doing that long before Papillon was born.
I'm convinced that it's Papillon's mannerisms and personality that makes him so likable. One moment he's pulling things out of his crotch like it's the most normal place in the world to store things, and the next he's saying some of the manliest lines in the entire series ("A choice is something you make, not something you are given!"). If we had enemies like this, who would need friends?