It's kinda gross, but I'm check-folding river. I don't think you will get herocalled/bluffed by worse, and villain has all the bigger sets and suited Tx broadways and maybe AT.

Flop is x/call or x/raise, flop favors raisers´ range and we want to protect our x/calling range. River is x/fold in a vacuum-

Well flop thinking is Villan will not bluff as wide 3way with the fish and I just want to get value from the fish.

What about betting small on the river?

I would x/c flop & turn. As played I would probably bet small ~20 and fold to a raise.

Preflop is a check, but thinking about donking range in similar spots is great and its not a huge mistake imo.
Fwiw iirc baluga in his book argued that we should develop a donking range whenever the rec acts before the second reg, and always check when the pfr (reg) acts before the rec. Im not totally convinced.

river is a xf in my book, but I'd be damn sure to check all my Tx combos too (you should have some...sure, its mostly TdXd combos, but still). I just dont see any value. If anything, I'd consider bombing to fold out better sets (both of you have very few Tx, but you should have a couple Tx more than the villain imo), but that just gets ridiculous.

No reason to check river imo, villain never bluffs river on this runout, very rarely has any Tx and will definitely call a small bet will most of his 2p combos. I would bet small

Also I would expect villain to raise turn with most of his sets

Not sure I like the flop donk. Checking river but other than that I don't think the river should affect your decisions very much.