Villain is 30/6 over 40hands

Full Tilt No-Limit Hold'em, $0.05 BB (8 handed) - Full-Tilt Converter Tool from FlopTurnRiver.com

SB ($7.32)
BB ($7.57)
UTG ($5.37)
UTG+1 ($4.69)
Hero (MP1) ($5.34)
MP2 ($5.03)
CO ($4.47)
Button ($5.36)

Preflop: Hero is MP1 with K, A
2 folds, Hero bets $0.17, 1 fold, CO calls $0.17, 3 folds

Flop: ($0.41) 10, 9, Q (2 players)
Hero bets $0.25, CO calls $0.25

Turn: ($0.91) 4 (2 players)
Hero bets $0.60, CO calls $0.60

River: ($2.11) J (2 players)
Hero checks, CO bets $2.11, Hero calls $2.11

Total pot: $6.33 | Rake: $0.42


I guess turn would better be a c/f but my b/f (yes i was planning to fold to a raise) line is not the worst in the world. So now on the river we hit the broadway with villain calling down 2 streets aka the flush draw is a big percentage of his range. I decided to call because i saw him do some big bets on late streets when checked to 2-3times already. Soooo i think theres some queens in his range aswell as air and some rivered 2-pairs that he would overplay like this. He could also be going bonkers with some Kings here.

What would you have one here?

Well, let's say your opponent's range is fairly wide, like:
JJ-22,A2s+,K9s+,Q9s+,J9s+,T9s,98s,87s,76s,65s,54s, AQo-ATo,K9o+,Q9o+,J9o+,T9o,98o,87o

Of his entire range (assuming he doesn't fold):
flush 5.4% of the time
AK 1.16% of the time
Set (99-JJ) 3.47% of the time
2pair (Q9, QT, QJ,JT) 14% of the time
pair+gutshot to worse str8 (KQ, K9, KT) 13.5%
pair+idiot gutshot (87,98,T8,Q8) 10.4%

Now it's a question of -- what does he try to bet pot with on the river?
If it's flushes and AK, and never straights or sets, you should probably fold as you are beat >80%. If you think it's possible he gets there on the river AND will try to valuebet a Kx/set/2pair type hand, it's a good call.

However, I'm not sure people at $5 NL bet a K on the river there -- i expect them mostly to bet flushes. I guess if you suspect that your opponent likes to randomly pot out on the river, then you very likely have him crushed with the straight.