You will say to me then, “Why does he still find fault? For who can resist his will?”
Romans 9:19 ESV

If God chooses one person to play the antagonist, the fault is already that person’s. God didn’t force him to sin. Pharaoh was chosen for his role because of the kind of man he was. There were thousands of other Egyptians (the same lump of clay) that God could have chosen for that role, but Pharaoh has no right to complain that God chose him instead of someone else, because Pharaoh was determined to play it anyway.