mp is rec(not bad) and CO I consider good reg 32/21/7.5 AF 2.8 on 424 hands, pfr/vpip gap is from him limping SB or overlimping sometimes

PokerStars, Hold'em No Limit - $0.25/$0.50 - 6 players
Hand delivered by Upswing Poker

UTG: $50.35 (101 bb)
MP: $73.61 (147 bb)
CO: $51.76 (104 bb)
BU (Hero): $69.57 (139 bb)
SB: $55.15 (110 bb)
BB: $20.81 (42 bb)

Pre-Flop: ($0.75) Hero is BTN with K♠ Q♠
1 fold, MP calls $0.50, CO calls $0.50, Hero raises to $2.50, 2 players fold, MP calls $2, CO calls $2

Flop: ($8.25) 9♦ 8♠ 5♥ (3 players)
MP checks, CO checks, Hero checks

Turn: ($8.25) 5♠ (3 players)
MP checks, CO bets $4, Hero calls $4, MP folds

River: ($16.25) 8♥ (2 players)
CO bets $11, Hero raises to $63.07 (all-in)

I think he can valuebet even good 9 as most of my overpairs would mostly cbet, obviously he have str8's in range, as well as both boats, but way more likely 5x given his line, but i think i can creditably rep both 8 and weak 5, and only calling to see him bluffing A hi would be disaster, what you guys think?

You rep only 2-4combos of 8x, and you block bunch of b/f hands and no value hands.

a8o, all suited connectors with 8, other than 89, a lot of suited gappers, all suited 8x face cards i think, a lot of 8's on btn
Blocking some bet folds sucks, but he is not overlimping spade broadways, maybe bottom suited aces, no idea how many random offsuit mid cards he overlimp with

I thought you were CO. So bit more 8x then I initially thought, Not sure if A8 and suited gappers should iso vs two limps. I would raise something like CO OR range.

What is important dose he folds more then 65% of the time? Well i don't think so and blockers make it worse.