TT vs weird line

His stats say (yes I know... only 32 hands) he's a bit of an aggro clown but also the flush got there, He could have checked back for the fee card.
Why not bet the river yourself and see what that brings?

Then he might fold because he is scared of the flush .
If he goes ballistic you know you can fold.

What does bet on the river accomplish?
It is not a v-bet. This is turning really good SDV into a bluff.
(IMO).

I don't hate the idea of betting ourselves here. Then you can decide the sizing yourself. The board is paired and flush got there so we might be able to fold out many better hands, like Qx and even some straights (JT). I wouldn't say our hand has really good showdown value, it is a bluff catcher and not even the best ones we have.
But I don't think check calling is that bad either.

We cannot bet here and I do not think Qx will fold that much.
Like it as played, as we have showdown value and should take the hand there as cheap as possible.

I would consider min4betting this preflop (fish doesn´t fold vs it) and TT is quite strong - but for that I would need to know whether the fish is 3b very light pre. OTF I think call is clear. OTR I would simply fold. I don´t think he is really gonna bet his air when the flush completes, I rather imagine fish is gonna be afraid and x b. When it comes to betting ourselves I don´t think that´s smart, fish is not gonna fold his Qx (like ever I´d say). So, without further reads I would just x/f OTR vs fish.

I will always 4-bet here, wont give up the initiative that cheaply vs agro fish. You have neither position and a hand that plays well postflop, so you'll end up in tough situation very often. The rest is OK I think.

Why would you bulb the pot preflop if we will be in trouble postflop?

Nitrol: the idea is, that fish tend to call this 4b with a LOT (they wanna see the flop), so we are getting value out of K2-9x for example and so on.

It's a marginal situation, but I think we are slightly ahead of loose aggro BTN's range here OTR. I can see them occasionally semi-bluffing OTF with Ax flush draws/AK and checking behind OTT for a free card. Qx/higher pocket pairs is unlikely since they missed the turn v-bet. Well played IMO.