I've seen a lot of takes on villain Deku, and honestly, most of them miss the mark. They just slap an 'evil' label on him and call it a day. The good ones dig into his backstory—that's where the real meat is. Think about it: a kid with a desperate, all-consuming dream, fueled by endless notebooks and analysis, who gets that dream crushed not just once but systematically. That obsession doesn't just vanish; it curdles.
If he turns, it's not about power for power's sake. It's the ultimate, twisted application of his analytical mind. He'd see hero society as a flawed system to be dismantled and rebuilt, not just smashed. His motive would be a cold, meticulous fury, born from being told he was worthless for wanting to save people. He wouldn't be a chaotic monster; he'd be a terrifyingly competent one, using everyone's weaknesses against them because he's spent his whole life studying them. That's way scarier than a guy who just wants to watch the world burn.
I guess what I'm saying is, a villain Izuku written right isn't the opposite of who he was—he's the darkest possible extension of it. He still wants to fix things, but the methods and the end goal are completely corrupted. That backstory doesn't create a generic bad guy; it forges a specific, heartbreaking kind of antagonist.