>>95141127easiest one is main arch nemesis hero gets killed off and the villain seeks revenge, maybe even tries to fill the shoes of the hero afterwards.
do it like a sort of conspiracy, investigation type shit, also add in some flashbacks of the hero and villain having a beer, catching a break having an honest conversation or any small moment type shit that lets the reader know the villain isnt an animal and that he had a history and a sort of friendship with the hero. this may even be retcon for all i care, they're important to the story. doom by benis is a good example of this.
this setting could work for green goblin ( even if we got heroic normie before ), bullseye and DD, zemo and cap, really works for most characters which is why it's been done to death