How is Polonius manipulative?
Also question is, what type of person is Polonius?
A Danish lord, Polonius is the father of Laertes and Ophelia. And he's exactly the kind of dad who's so embarrassing that you don't even want to bring friends to meet him: he's self-absorbed, long-winded, and dull.
Hereof, how does Polonius manipulate Ophelia?
When her father ordered her to quit seeing Hamlet, she agreed —"I shall obey my Lord". Later, when Polonius used her as bait to spy on Hamlet for King Claudius, she did exactly what she was told. As long as she was unmarried, she lived by her father's rules.
Polonius was King Hamlet's loyal servent, well liked and trusted by King Hamlet, Gertrude and Hamlet. But his loyalty to King and Prince Hamlet is limited. If Polonius was actually loyal to King Hamlet, then he would have never supported the deceitful, murderous Claudius.