Villain is a reg who doesn't like to fold to check raise

iPoker - €0.20 NL (6 max) - Holdem - 6 players
Hand converted by PokerTracker 4

Hero (BB): 100 BB
UTG: 141.8 BB
MP: 193.55 BB
CO: 33.6 BB
BTN: 100 BB
SB: 107.2 BB

SB posts SB 0.5 BB, Hero posts BB 1 BB

Pre Flop: (pot: 1.5 BB) Hero has K 6

fold, fold, fold, BTN raises to 2.5 BB, fold, Hero calls 1.5 BB

Flop: (5.5 BB, 2 players) 7 7 4
Hero checks, BTN bets 1.65 BB, Hero raises to 8.3 BB, BTN calls 6.65 BB

Turn: (22.1 BB, 2 players) K
Hero bets 16.1 BB, BTN calls 16.1 BB

River: (54.3 BB, 2 players) 5

Prefer just calling otf. As played raise a little smaller otf. Now block bet otr.

I think raise or call are fine otf, but I would say that you don't have a huge amount of value raises otf but a lot of potential bluffs, so as long as you aren't overdoing the bluffs, it seems like a good play.

Turn, I think you can go either bet or check, bearing in mind that I'm not sure you want to be firing off two healthy bets on turn and river. My preference goes to checking this particular combo, as you should at least some better Kx, although it really depends on how many Kx you x/r otf.

River, I think you could choose a 2/3ish pot size (but how many worse hands are you getting called by? I think you'd have to hope to get called by a lot of villain's 88-QQ for that to be worthwhile), a smaller 1/4-1/3 pot size (and probably look to call vs raises at least some of the time), or a x/c. Maybe you could even go for an overbet, I wouldn't feel too comfortable with that as villain can probably have some 7x, but I'm not sure your hand is the best to go into that bet sizing, someone with better knowledge may know more. Personally, if villain is fairly stationy, I'd go for the larger bet size, if they're a little bluffy, the smaller size or the check (and probably the check).