Yeah SF… I agree with your Defenders assessment on Namor, Hulk and Surfer. (Though of the three Namor might have been the only playable chara… then again with his frequent displays of temper. Doubtful!)
Dr. Strange in the early days was the PC… I think it was pretty much the GM and 1 player then. LOL
Clea (NPC tool for Dr. S… and not a good one)
I think Val was definitely a PC.
As was Hawkeye and Black Knight in those early days (Pcs - of the Avengers that appeared I think all but Iron Man would have been NPCs, though he may have been one too!).
Nighthawk… definite PC (LOVE HIM!).
Power Man, Daredevil and Hellstorm were all NPCs (So were the Guardians of the Galaxy).
I think a case could be made for Red Guardian as a PC (Though the player had to quit the game and got deported or something like that. Her later appearances definitely place her in the NPC framework - along with uber-cool looking Russian foe the PRESENCE!! (possibly one of the single best looking foes of that period).
ENTER: Hellcat! Yeah… this girl had PC written all over her.
Moondragon… ever the degenerate NPC she always was!
Moon Knight during the Zodiac Key period (AWESOME STORYLINE! - gorgeous Giffin precursor Legion of Super Heroes artwork!)… was played as a PC for the time he was there.
Might be noted that Yellowjacket’s appearance in the Defenders might as well have been played as a PC.
Here is a shot of the DEFENDERS HQ and the membership lineup of the time.
Once you get past Issue #50 of the Defenders (The best story in the Defenders run)... you move into some interesting areas (including the gorgeously rendered Defenders #53! by Dave Cockrum, Keith Giffen, Mike Golden and Terry Austin and issue #54 by Giffen and Golden, with some Perez and Gil Kane covers... definitely awesome! and where I originally came in at).
Ms Marvel appears in the late 50's issue... I'd put her as a PC. Just for her amount of activity.
Devilslayer appears... I think he is an either/or chara... PC or NPC depending on the GM... likely NPC.
But it is when you get to Defenders #62-64 that things get VERY interesting. Cause along with with standard Defender's cast of Hellcat, Hulk, Valkyrie and Nighthawk... who unbeknownst them a membership drive has been made... attracting these heroes:
Hercules
Havok
Captain Ultra
Black Goliath
White Tiger
Iron Fist
Falcon
Torpedo
Stingray
Prowler
Jack of Hearts
Nova
Son of Satan
Tagak
Polaris
Marvel Man
Captain Mar'Vell
Ms Marvel
and finally... Paladin! (WHEW!)
I wouldn't even begin to know where and who to pick for PC and NPCs for this... The last three on the list split before actually trying to do some... umm heroing.
As far as later on goes... there is the appearence of Omega-Man and Avengers; Yellowjacket, Wasp and Black Panther, Ghost Rider as well as more Devilslayer, The Squadron Supreme (Before they sucked) and the Gargoyle, as well as the coming of Iceman, Angel, Beast, Son of Satan (again), Overmind, Andromeda, Moondragon (yuck!), Cloud and Manslaughterer or whatever.
Of all listed above... PCs would probably be...
Devilslayer
Gargoyle
Beast
and Andromeda.
The rest were NPCs (at least in my mind).
G7