No reads. That means he is probably a slightly losing TAG. He called the turn in under 3 seconds.

I don't get the question. Looks like an easy fold on the river. Flush makes a very big part of his range IMO.
A case could be made for checking the turn behind or betting bigger. Preflop and flop are standard.

Im gonna say he has [Jh] or a small flush. Whether or not he would fold those to a large raise is anyones guess.

Oops. In that case, Im really struggling to put him on a hand. It has to be either small flush or some hand that has no chance of calling a big raise.

Maybe he called the flop with just overcards, thinks hes ahead and doesnt wat you to check behind? KQ? or KJ?

I guess you called and won but I think I would lay this down. He could have two-pair or a set here, if he was looking to check/raise a blank turn. Either way, river looks like either a blocking bet from a hand that beats yours, or a valuebet from a hand that definetely beats yours. The only hands you can beat are 76 and JT, if that's what he had, fine, but with if I make that call I am sure it is -EV.

I don't see him having a flush here very often. He would usually make a move on the flop with a flush draw (considering most likely combinations out there contain a flush + straight draw or pair, or nut flush draw) and he should definitely want to get more money in the pot on the turn if he hit (as well as protect his hand if it isn't the nuts).

His range looks something like missed draws (JT, 67, w or w/o a heart) and hands like 9x trying to get to a cheapish showdown. He could also have a hand like T or Kx but I think both these are fairly unlikely (oop float) and can basically be disregarded as they 'cancel' each other out.

I would call, but it may be a mistake. Lately however I've been seeing a lot of people making weak-ass bets on the river as bluffs (because I'm a CS when it comes to the river) so I think calling here would be correct. If it is wrong, it isn't wrong by much. Basically 90% of these situations and hands can be summed up by saying "it doesn't really matter too much what you do".

Oh I totally disregarded the quick turn call. That's generally an indication of a drawing hand - more of a reason to call. If he had a big hand he would at least consider raising and a mediocre hand should consider folding.