The Ghost

I believe that the ghost is neither malevolent nor benevolent. I would believe it to be benevolent except that it wants Hamlet to take revenge on his uncle, Claudius.
I think it’s more malevolent because of its wants.

I believe it to be Hamlet’s decision as to whether the ghost’s visit is made malevolent or benevolent. I believe that, if Hamlet takes revenge on Claudius, then the ghost’s visit was made malevolent, and if Hamlet doesn’t, then the ghost’s visit was made to be it’s own decision.

The ghost is going to tell Hamlet that Claudius killed him by pouring a poisonous vial into King Hamlet’s. It will change Hamlet’s reasoning for why he does things.
Hamlet will act like he’s going insane to deceive those around him because it’s easier to kill the King if nobody suspects you of anything.

Anthony