I have heard heard some people claim that Jernau Morat Gurgeh (from Player of Games by Ian M Banks) is probably autistic, but personally i think he’s more Ace-coded than anything else. Maybe you might think otherwise?

Personally I think a better example is Stafl-Preonsa Fal Shilde 'Ngeestra dam Crose, the Referrer from Consider Phlebas. She has a fixation on free solo climbing, and enough brainpower that supercomputers go to her for advice. I personally found the robot that was crushing on her to be super cute.