Introduction to character as minor opposition of Hamlet as he is simply a pawn of Claudius.

Claudius:  Have you your father's leave? What says Polonius? Polonius: He hath, my lord... …I do beseech you give him leave to go (Act 1, Scene 2, Line 260)

Polonius advises Ophelia to reject Hamlet’s advances:

Polonius: I must tell you / You do not understand yourself so clearly (Act 1, Scene 3, Line 582-583)

Polonius as a good person

Polonius: That hath made him mad. “I am sorry that with better heed and judgement” (Act 2, Scene 1, Line 108-109)