Vilain is 22/20/11 over 1.8K samples. A decent reg.

pre : His SB RFI is like 55. So 34s would be fine to defend here, I think. Prob all 3 options are fine.
flop : Just call vs 30%CB.
turn : Generally Low cards would be good for BB range on this spot. Polarized pot bet w 2pair.
river : 2pair ott turned into shitty marginal otr. Bluff or ShowDown? His check call range would be like weak Kx, some QQ-55, A and low pair hands, some nut FD hands. Check back with a sigh.

What type of hand should I bluff with on the river?

On this exact river, my bet size would be very polarized, pot over at min? Because my turn pot bet range contains less Kx and more straight or set type hands. Regardless of whether it's a bluff or a value, want to go huge here. I don't think he check call ott w sets. Its mostly Kx and pair/draw type hands. Thus I choose some busted FD with Q/J.

Any input would be appreciated. Thanks :)