Does Manga count?
If so-
Hero: Kei Kurono of Gantz. He’s just a regular dude in crazy situations (but wears a suit that gives superhuman abilities until it takes too much damage), fighting aliens & monsters. The whole manga really enthralls me (main characters die all the time, lots of individual and social criticism), but he’s just trying to survive and not really be a “hero.” It’s just all his team members see him that way. If I had to go “Western” it would be Batman, or some other believable human hero that have their own problems. Pic below of Kurono in said suit, with a couple of teammates.
Villain: Darth Vader. Good-bad-good sort of evolvement. He wasn’t necessarily truly evil, just seen as evil because of his ways (mind you, I’ve not read any extended universe that may say otherwise). He still tried to appeal to his son, rather than kill him, which shows there was humanity left him - which comes again later on.
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