When it comes to superheroes, the devil is in the details.
There are about a bajillion things that can go wrong when designing a superhero, whether because there are just so many of them out there that not enough stand out features on a new character will make them fade into the crowd, or because you overlook a bunch of tiny little details that don't work, which end up making the entire house of cards crumble.
Or sometimes you get the design right but there's something about their powers, or their origin, or their supporting cast, that just flat out does not work, and needs to be changed. And it seems like something small, but when a writer comes along and DOES change it, the whole thing starts working like a switch watch.
Sometimes changing just one or two details, no matter how subtle, is all it takes to take a character to the next level. This list is a tribute to those decisions, the parts of our favorite iconic heroes and villains that we all take for granted now, but back when they first debuted, didn't really exist..