Most incorruptible hero, most irredeemable villain
What hero could you never see going to the dark side, what villain would never turn hero, no matter how clever the writer?
I've been surprised over the years by characters like Eddie Brock and Hal Jordan, but there are some heroes and villains that just cant be done, i think.
Hero wise, Captain America will never turn villain. He's gone against the government before, but he'll never get into the world take over business. No way.
Villain wise an easy pick is Cap's arch foe, Red Skull. Red Skull. I dont think i even need to elaborate on that one.