Though I'm actually mocking the movie, I nominate Duke from Golgo 13: The Professional. He's either an Aspie or a Mary Sue. I can't tell which. Let's see, he has no expression, no affect, no inflection in his speech patterns, no personality, and is a professional assassin. He must be the most unappealing and uninteresting protagonist in the history of anime. And somehow, he is shown having sex with every woman in the plot, like James Bond, including som unnamed perk girl at the beginning who is never seen or heard from again or even referred to. His expression is still stone cold and lifeless during sex as well.
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"And lo, the beast looked upon the face of beauty. And beauty stayed his hand. And from that day on, he was as one dead."