One of my favorite kinds of redemption arc is the one where the villain is like “only i get to beat you” to the hero and grudgingly helps them fight an even worse villain, but then over time it gradually devolves into “of course i have make sure you get enough sleep and eat breakfast. I cant have you collapsing when we’re fighting” and keeps it up as a very poor villainous excuse for watching out for their new hero friend who they wont admit theyre fond of and wouldnt ever actually hurt now