Sigh...Quinn. After his spaceport scene on Balmorra I thought "Smart, check, useful, check, capable of figuring out the job, check, done." When I realized he was recruitable I dropped my warrior then and there and rerolled female. That whole, horrible, half-invisible, painful, up-and-down, uncertain, every-time-I-give-up-he-does-some-ambiguous-thing, every-time-I-get-my-hopes-up-he-steps-back, awkward ride was fantastic.
Edit: Plus, he has Simon Tam's general coloring, education, job, and interpersonal nervousness. Firefly fans will know what I'm referring to. I didn't consciously pick up on it for a long time, but I think that contributed to the devastating weakness I had for Quinn.