Mr. Zero

Q: Has there ever been a more notable or successful reinvention of a villain than the transition from Mr. Zero to Mister Freeze? -- @spacetimeboss A: Friend, you are not kidding about Mr. Freeze. As much as heroes and villains change over the years, and as much as they have to change to stay relevant as hundreds of creators work on their ongoing stories, I honestly don't know if there's any bad guy who made a change that dramatic, both in terms of theme and quality. He goes from being a one-note crook with an ice gun to one of the most compelling and tragic figures in Batman's entire Rogues Gallery. I'd even go as far as saying that aside from Two-Face, he's the easiest of the major villains to sympathize with --- and he probably works in a whole lot more stories besides.