For the most part, when someone thinks of a superhero, they recall the good they have done. Captain America punched Hitler in the jaw, Peter Parker realized that with great power comes great responsibility and so-on. Superheroes and good people go together like peas and carrots, but that's not always true.
Every once in a while, a new character will be introduced as a villain. They may evolve over a long period of time to become an anti-hero like Venom, but in some cases, a villain is too good to pass up as 'just another bad guy.' When this happens, they shift from being good to being bad.
It could have been the plan all along, or it could be something a new writer or artist decides to try out. Typically, this works rather well, and when it happened years ago, it's easy to forget that some of the best heroes from DC and Marvel Comics didn't start out that way.
This list highlights the characters who started out as bad guys but became good. They aren't anti-heroes; they're heroes, through and through, so Namor and Venom aren't considered. Instead, these ten heroes are good guys now, but they didn't start out that way.
Jonathan is a graphic artist, illustrator, writer, and game designer. Jonathan retired from the U.S. Army in 2017 and enjoys researching and writing about history, science, theology, and many other subjects. He writes for ScreenRant, CBR, NerdBastards, Listverse, Ranker, WhatCulture, and many other sites online. You can check out his latest on Twitter: @TalkingBull or on his blog: jonathanhkantor.com