My power would be telekinesis. I'd be meta as hell. One liners, terrible puns, constantly pointing out tropes, giving my henchman name tags that say "Henchman #1", "Henchman #2", "Bob",etc. And I'd monologue all the time. I'll even set up video diaries around my lab for heroes to find explaining my rise to power. Oooh, maybe host a game show where the winner becomes my arch nemesis. This would be positively delightful.