ENTP are supposed to be at least a little live and let-live, and he's not at all. He's strict and strng-willed, wich are more ENTJ traits.
S? Hell no. Inara is the second most obviously intuitive character aboard the ship, after River. She gives off a "mystical mentor" vibe very typical to NFJs, and shows a great deal of foresight.
I hav'nt seen that... For me she's above all a sexy slut with strong social and organisational skills, so ESFJ. But, yes, she
could be ENFJ, but she's definetley an Fe-dom.
Wash is highly sociable, and his piloting style seems highly experimental ("improvisational" wasn't the right word -- apologies to Whatever, Se can be improvisational). He just tries different approaches he thinks up to get out of tight spots, and like Mal he does show a certain amount of foresight (this could of course be tertiary Ni, but that's highly unlikely given his Te is far too strong to be inferior -- he's actually better at planning capers than Mal is). ENFP.
Kind, quite and nice guy who's able of intense action and to find creative practical solutions to urgent problem. For me, he's ISFP.
Now this is lulzy. Simon, ESTP? Socially awkward, stuffy, businesslike Simon ESTP? Ni-on-crack Simon, who came up with an intricate plan to rob a fucking medical facility, ESTP? C'mon man, you can do better than that.
Yes, but he's more self-assured at the geginning of the first episode. But, yes, ISFJ for Simon.
Book seems a bit too quiet for an ENFJ, and not preachy enough.
He's quite, but also to much warm, greagrious and not enough withdrawing to be INFJ. He's clearly not chart-the-course, but in-charge. He's not preachy, but tolerant, but because he's a 9 as you put it, not because he's Introvert.