'Quiet', from Metal Gear Solid V.
Mostly because facially she looks really 'normal', sort of like somebody I imagine I could actually bump into in public. Her features seem to be a bit 'off' but in an attractive way that makes her look a bit more 'real', as opposed to other female characters who are almost 100% symmetrical and 'perfect'. She's a bit average, and I like that.
Plus she's not caked in make-up. I'm not against make-up but female characters are usually drenched in the stuff to sex up the otherwise mediocre looking character model.
And to top it off, she's pretty bad*ss. Even Ocelot seems a bit weary to **** with her.
I'm not a big fan of her costume though. It just seems out of place for a series where the women are usually as well dressed for combat as the men. It's the context I have issue with, otherwise I would be fine with it.
[Edit] Context is provided. It's weird, but the costume (or lack of) at least makes sense now.