how to deal with a loosie passive

here are my thoughts on the situation. first, i am surprised he did not raise his 2p, expecting me to keep betting into him. knowing that he calls 6xbb raises with such trash as Q2s out of position [as is typical for most fish], how should that affect later confrontations? for example in the second hand he led the turn when checked to. doesn't look like a draw since he would probably check it; probably a king (given his aggro factor). the last hand i check turn because he may check a A/K again expecting me to bet. maybe value bet the river here?