I am a bit hesitant when it comes to further advice, or at least I don't think my opinion alone would suffice if you go for a pan MC, after all (since I am kinda out of touch with the pan label and all). 
I could give you some insight on the difference between romantic and sexual attraction, though, since I feel like that could play into your story a bit—I mean, can someone be sexually attracted to a robot? Or is it romantic interest then? And since I'm on the ace spectrum (and bi-romantic), that's insight I would feel comfortable in giving. ^^
You can shoot me your questions, of course, and I can decide if I am qualified when I see them?