Character in act ii of hamlet

Although I would like to write about Horatio or Marcellus, they didn't say or do anything important in act ii.

The really important character in this act was polonius. His intelligence went way up in my mind. He understood most of the meanings in what hamlet says ("how pregnant sometimes his replies are"), he came up with his own evil scheme to spy on his son and get him back home, he goes and tries to make hamlet stop loving his daughter, he has the uncle and Gertrude watch hamlet to see if he's going to do anything wild with regards to Gertrude, and he says things that aren't completely daft. On the other hand, he still rambles on randomly, he makes fun of his aging brain, others make fun of his mental incontinence, and he does things (though intelligently) that most would consider stupid. Like trying to prevent his daughter from falling in love, whet his son kicked out of school, lock his daughter up in a room, tries to get hamlet to talk to Ophelia, sets hamlet up to say dark and gloomy things, and acts in an overly-friendly way that is not to his own self true. These two sides of polonius are a foreshadow to the reader because they tell us that polonius is two-faced, we can't trust him or his morals, and his is smart when doing bad things and stupid when not. Polonius, in this act, becomes more of a character to watch, because Shakespeare is setting him up to do something bad.