I was actually considering making NPCs based on Sam and Dean for my campaign as good catch-all npcs I can have show up for no real reason other than supernatural evil being afoot. Off the top of my head here would be their stats circa season 1 & 2.
Sam Winchester
HC: Reluctant Monster Hunter
Trouble: Forever Stained by Demons
Apsects: Living in My Fathers Shadow; I'll Kill the Yellow-Eyed Demon at all costs; Tried Living a Normal Life, and People Died for It; I Want to KILL my Brother, but not Really; Everyones Always Trying to Pull my Strings.
Stats:
4: Scholarship
3: Guns, Deceit, Rapport, Conviction
2: Contacts, Athletics, Resources, Investigation
1: Discipline, Intimidation, Empathy, Lore
Stunts:
-1 "Master" of Disguise (Deceit): +2 to Deceit when using forged documents, identification, or disguises.
-1 Egg Head (Investigation): +2 when using books or computers when searching for information.
-1 Techno Demonology (Scholarship): May use the Scholarship skill when researching supernatural creatures/happenings on the Internet.
Powers:
-0 Cassandras Tears
Total Refresh: -3
I couldn't think of too many stunts that really applied. So as someone else already said, I think the extra fate points represents the "Jack of all trades" feel of the character. I figured the Minor Talent template made the most sense giving him Cassandras Tears to represent his visions. You could easily justify temporary powers for him, and by season 4 you could probably say he's a Focused Practitioner, Demons being his practice.
His stats are also supposed to represent him as a "well-rounded" character, with no stats at 5 and only one at 4. He's blocked for a Chest-Deep game.
I'll post one for Dean when I'm not on a phone.