Decided to post this hand, cause I am not sure about Villains range OTR.
After he checked I would cut his range into 3 categories:
give ups: busted FDs, SDs and gutters (maybe an argument for a small sizing like 1/4pot or so)
9hXh type of hands which may call against a smaller sizing.
strong Tx, but not all the time since Tx might just call the flop or check the turn, so probably only AT is a real canditate and rarely some boats and overpairs - only from these hands I would expect some resistance
Is the majority of his hands in category 1 and 2 or not?
Am I missing some hands which he can potentially have?
Villain is unknown