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Magneto hands down. He is the most complex villain. With his background story being that he survived the holocaust and seeing how that shaped and molded him into the man/mutant he is today. It's a very impactful and sympathetic story. Michael Fassbender portrayed that sentiment perfectly in First Class. "Never again will I be at the mercy of men just following orders." A close second to me is Dr. Doom. I don't know much about Doom but the few times I've read him in stories, like Hickman's Fantastic Four and Future Foundation run he was very intriguing.
Dr. Doom!!! In my many years of reading Marvel Comics, Doom is the one dude that everyone, hero and villain alike, worry about. If Doom comes on the scene everyone has that, "Oh Sh!t" moment. So anyone who is feared that much...has to take the top spot.
DOOM THE MAN WHO CAN CHALLENGE GALACTUS TO A BOXING MATCH AND WIN on a phone so can't share scans just search doom vs and you will see his amazing victories and embarrassing losses
Dr. Doom @betatesthighlander1 @comicstooge @noone301994 @misterwhisper