My two cents for Firefly character stats:
Stats (all): All at maximum peak level for each specific character.
Stats (River Tam): PSI off the chart.
Skills (all): Win 6, Not die 6, Come out on Top 6, Do that thing no one else could do before 6, Shoot things with Gun 6, Hit things 6.
Skills (Mal Reynolds): Be a murdering hypocritical jackass 6, Honor -6, Violate the rules of Duels 6, Convince audience that he is really a nice guy 6, Acting like a proper Free Trader Captain 0.
Skills (Inara Serra): Prostitute 6, Convince audience she isn't a prostitute 6, Meaningless insights into life and the universe 6, Look real smart when spouting the former 6.
Skills (River Tam): Worse acting in ages 6, Use any and all psionic power 6, Spouting nonsense in undecipherable Australian accent 6.
Skills (Zoe & Hoban Washburne): Making interacial marriage work 6, Looking cool while doing the former 6.
Equipment: Whatever they need, when they need it; unless dramatic tension is in the order of the day.
Contacts: Whatever is needed in the episode
Allies: Whatever is needed in the episode
Rivals: Whatever is needed in the episode
Enemies: Whatever is needed in the episode
The Firefly
Hull: Simultaneously big and small enough to fit whatever the plot requires.
Armor: enough to never blow up.
Thurst rating: Speed of Plot.
Fuel: Phlebotianized Handwavium.
Weeks of Operation: Until the series gets cancelled.
Also, the skills most NPCs in the series have. Not all of them will have the full list.
Die 6
Fail to kill main character 6
Looking like a poncy git in ridiculous clothes 6
Looking like Imperials from Star Wars 3
Being total asswipes to make the main characters look good 6
Fail to generate any simpathy with the audience 6
Finally, the series has its own skills.
Fail to be a good Sci-Fi series 6
Generate Rabid Fandom 6
Demonstrate American Civil War fetish 6
Rip off Traveller RPG 6
Annoy humans with country music 6
Show less than passable CGI 6
Jokes aside; I think adapting movie or tv series as NPCs is a terrible idea. Thronly rule that defines them is that they break all rules. Trying to fit them into a structured system as an RPG and expect them to be what they were in the movie/series is impossible.
The crew of the Firefly would not last a week in the OTU.