Cartoon enemies

[Trivial]

Zuko treatment vs Skeletor treatment.  Go!

[Doktor Howl]

Doktor Howl vs Twid.

[Faust]

I'm conflicted, on one hand no one wants to see a reformed hooded claw. But on the other Vegeta and Goku's rivalry escalated and became more dramatic and nuanced when they were were both fighting on the same side.

[Al Qədic]

To me, it depends on what the villain does, and how they feel about it. Redeeming Zuko worked because he had regret, really struggled with his allegiances (still don't think he should have listened to Azula at all by the time the end of book 2 happened), and didn't do anything too heinous for the circumstances, or in comparison to dear ol' dad.

...dunno anything about Skeletor, but I'm fine with letting a ham carry on being a ham, even if the ham is equipped with death lasers.

[chaotic neutral observer]

I'm conflicted, on one hand no one wants to see a reformed hooded claw. But on the other Vegeta and Goku's rivalry escalated and became more dramatic and nuanced when they were were both fighting on the same side.

A related question is whether good and evil are treated as innate, unalterable characteristics, or if characters can grow and change (or decay) during the course of the story.

I find dynamic characters are almost always more interesting to watch, although if everyone can be redeemed the plot becomes too predictable.  Cell, at least, needed to be vaporized.

[Pergamos]

I like the redeemed villain saving the world from the fallen hero. although I can't think of a good example at the moment.