Villain: young Caucasian, clean cut in suit, coat and tie. Only sat down for one lap, but does actions with excessive deliberation (carefully counting out and pushing out chips, etc.)
Hero: Only played one hand (limp on button, miss/fold on flop) during 2 laps villain has been present. No prior history with villain.

Effective stack size $200 all around

UTG: fold
EP: fold
EP+1: call $2
MP: call $2
MP+1 (Villain) raise to $10
CO: call $10
Button: call $10
SB: fold
BB: (Hero) AK calls $10
EP+1: call $10
MP: call $10

5 see the flop ($51): A62

Check, with intention to raise. All others check.

Turn ($51): 4

Hero: Bet $40
EP+1: fold
MP: fold
Villain: Call $40
CO: fold
Button: fold

River ($131): 9

Hero: check
Villain: all-in ($150)
Hero: ...?

3b pre, lead flop/shove turn, shove river yourself, as played call. Don't think you could have played this any more passively...

3bet to $55 pre, not enough hands to know whether Villain is a nit, so against any random opponent I would think we are ahead of their range. Also would rather have betting initiative and heads up with AKhh than be out of position and multiway.

As played, bet flop $40, too many turn cards to kill your equity to risk a check/raise. Also check/raise turns our hand face up.

As played, bet/fold river $75

As played, fold river.

Every street except Turn misplayed imo.

Am I correct in concluding that you feel no level of mannerisms / tells / etc. would justify me putting him on a big hand pre flop, like JJ+/AQs/AKo levels of 'big' after only 2 laps?

Lol, snap call as played.

That is a good point. If he is staring into space, it is a weak hand. If he is quiet and looking down at his stack, it is a big hand.

Kidding aside, yes, after only 2 orbits I don't think you have enough information not to 3bet him with AK. You are ahead of even a tight player's pre-flop opening range.

Pre: don't like calling here when we are last to act. There is so much dead money here. We can "squeeze" and not be bluffing.

Flop: just lead out 3/4ths pot. We shouldn't be check raising here for two reasons. First, we don't know that the villain is aggro enough to cbet into 4 players. Second, when we check raise we are overplaying our hand. Check raising forces out many worse aces and pairs and has us continuing against sets and the like. Against some players (aggressive stations) and at some tables (really loose and wild) we might go for a check raise here. But it's never the standard line; we need a specific reason I be trying to get more than one bet in on any street. I'm happily bet/folding three streets here as a standard line. (Or b/f flop and turn then shove river.)

Turn is okay, but I'd bet pot to make it look like we are stealing it and to make up for missed value on the flop.

River is weird. Otoh, he overbet the pot. Oto, all the draws missed. He's not repping much so I call here, but folding is probably okay as well.

Yeah, I meant more the out-of-hand mannerisms. Everything he did just reeked of overly-tight, overly-conservative, bordering on robotic in his social interaction. I mean, "Mr. Data cracking a joke" levels here.

I bring this up only to mention that after two hours of playing what seemed like insanely tight poker, he bet and three-bet on a board of J-Q-Q-A on the turn with A7. I mentioned this hand off the table later to another player, and he immediately rattled off two stories where known uber-nits would inexplicably spew all-in at completely random times.

So yeah, even if I did have a read that he was a nit, not only (as you said) am I doing just fine against his range, there's even a chance on the river that he has AJ and he's gonna "show me what-for".

3b/f(to PFR) pre

AP lead flop 40

AP bet turn 40

River is weird. Your hand is underrepped but there are no worse made hands that value shove river and it's a very odd bluffing line. I probably fold lacking reads that V spazzes missed flush draws.