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I dunno, you're referring to one person, right? Saying "the idiot and genius" alone makes it sound like two people. If you have "the man who was an idiot and a genius eats an apple" you've now clarified that it's one person. If you make it "the man who was an idiot and a genius eat an apple" then it signifies two people, of which the aforementioned man is the idiot.
I would have used "the idiot genius" or perhaps "the idiotic genius."
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