River caught TP

PokerStars - $0.25/$0.50 (6 max) - Holdem - 5 players

UTG: $6.56
CO: $10.66
BTN: $4.96
SB: $4.78
Hero (BB): $6.85

SB posts SB $0.10, Hero posts BB $0.25

Pre Flop: ($0.35) Hero has 2♠ K♠

fold, fold, BTN raises to $0.50, fold, Hero calls $0.25

Flop: ($1.10, 2 players) 6♣ 9♠ 2♣
Hero checks, BTN bets $0.25, Hero raises to $0.50, BTN calls $0.25

Turn: ($2.10, 2 players) 6♥
Hero bets $0.50, BTN raises to $1.00, Hero calls $0.50

River: ($4.10, 2 players) K♣
Hero ?

This guy is loose-aggressive though his winning streak was pretty good. He definitely open-raises wider than ORC suggests and is capable of raising turn with made hands (not sure if there can be some small pockets, but TPs+ for sure). He'd cap preflop with AA&KK for sure so his calling range on the river roughly:

Board: 6♣9♠2♣ 6♥ K♣
       Equity     Win     Tie
BU     42.42%  42.42%   0.00% { 9d9h, 9d9c, 9h9c, 6d6s, Ad9d, Ah9h, Ac9c, Kd9d, Kh9h, Qd9d, Qh9h, Qc9c, Jd9d, Jh9h, Jc9c, Td9d, Th9h, Tc9c, Tc8c, 9d8d, 9h8h, 9c8c, Tc7c, 9d7d, 9h7h, 9c7c, 8c7c, Ad6d, As6s, Kd6d, Qd6d, Qs6s, Jd6d, Js6s, Td6d, Ts6s, 9d6d, 8d6d, 8s6s, 7d6d, 7s6s, Ad9h, Ad9c, Ah9d, Ah9c, As9d, As9h, As9c, Ac9d, Ac9h, Ad6s, Ah6d, Ah6s, As6d, Ac6d, Ac6s, Kd9h, Kd9c, Kh9d, Kh9c, Kd6s, Kh6d, Kh6s, Qd9h, Qd9c, Qh9d, Qh9c, Qs9d, Qs9h, Qs9c, Qc9d, Qc9h, Jd9h, Jd9c, Jh9d, Jh9c, Js9d, Js9h, Js9c, Jc9d, Jc9h, Td9h, Td9c, Th9d, Th9c, Ts9d, Ts9h, Ts9c, Tc9d, Tc9h, 9d8h, 9d8s, 9d8c, 9h8d, 9h8s, 9h8c, 9c8d, 9c8h, 9c8s }
BB     57.58%  57.58%   0.00% { Ks2s }

I included here some flushes (from FDs on turn), think he can do certain moves with them.

I saw him not betting marginal hands on scary boards (99 on KQxxx 3suited) in position so I think he's capable of not betting here as well.

I think I should bet but in case of a raise... I can't say it's bluff so often (honestly say, I didn't see him pure bluffing for 30 hands) but it doesn't mean he's not capable of it. So I think I play donk/call here.