The opponent is playing about 55% of hands and raisiing 22% pre flop. Looks to be using pressure and aggression to win hands. Doesn't need a hand to make the bet he makes on the flop.

PL $0.10/$0.20 Omaha - 6-max (Real Money)
Seat 3 is the button
Total number of active players : 6

Seat 1: UTG+1( $18.86 )
Seat 2: CO ( $10 )
Seat 3: Button ( $10.31 )
Seat 4: SB ( $22.77 )
Seat 5: BB ( $5.02 )
Seat 6: Chips->Middle ( $35.59 )

SB posts small blind [$0.10]
BB posts big blind [$0.20]
CO posts big blind [$0.20]

** Dealing down cards **

Dealt to Chips->Middle [ 5s, Kd, Kc, Jc ]

Chips->Middle calls [$0.20]
UTG+1 folds
CO checks
Button calls [$0.20]
SB calls [$0.10]
BB checks

** Dealing Flop ** [ 8c, Tc, 3h ]

SB bets [$1]
BB folds
Chips->Middle raises to [$3.60]
CO folds
Button folds
SB calls [$2.60]

** Dealing Turn ** [ Qd ]

SB bets [$8.20]
Chips->Middle calls [$8.20]

** Dealing River ** [ 8s ]

SB goes all-in
SB bets [$10.77]
Chips->Middle folds
Returning uncalled bet [$10.77] to SB

** Hand Conclusion **
SB wins $23.37 from main pot

How did I play it? and any ideas on what he has?

he's aggressive but does he fold to resistance? i remember a good nlhe lag that used to post here said that sometimes one of the worst things you can do to combat aggression is be more aggressive. In those cases, i like to play more passive in general and let them hang themselves until i make a good hand or a monster draw. therefore, i would probably just call on the flop, call on the turn and fold the river unimproved. let him hang himself and use your position to control the pot and play well against him.

yes, your draw is really good on the turn but he fires again so unless he's an absolute maniac postflop, he's got a good hand. You got too much to fold and the only real hand you beat on the river is QTxx so fold.