Hamlet: Son of the late King Hamlet of Denmark and nephew to the present King. Famous for the graveyard scene where holding the skull of deceased jester Yorick, Hamlet realizes man has little lasting control over his fate and also for describing man as the "paragon of animals!" Educated in Wittenburg and introduced to us in Act I, Scene II, Hamlet resents his mother Queen Gertrude marrying King Claudius within two months of his father King Hamlet's death to which she was previously married.
Fearing that his intentions could be revealed, Hamlet invents a madness to distract and hide his true intentions from King Claudius' many spies. This includes Ophelia, the women he loves whom he bitterly rejects when he learns she has betrayed him.
Cunning and inventive, Hamlet changes the lines of a play performed before King Claudius to divine whether King Hamlet's Ghost told him the truth about his father's death. At the end of the play, Hamlet kills both Rosencrantz and Guildenstern (indirectly), Laertes and finally King Claudius before dying himself from a wound inflicted by Laertes.
Horatio: Friend to Hamlet and the one person Hamlet truly trusts. Witnesses King Hamlet's Ghost in Act I. At the end of the play, Horatio wishes to commit suicide to join Hamlet in death but Hamlet convinces him to live so he can tell his story, restoring Hamlet's name.
Claudius: The present King of Denmark, King Claudius took Queen Gertrude whom he loves as his queen and wife, much to the consternation of Hamlet who believes his mother has betrayed him and his father's memory by doing so. Cautious and suspicious, Claudius has courtiers Rosencrantz and Guildenstern and Hamlet's love interest Ophelia spying on Hamlet for him since as he says, the great ones must be watched. Distrustful of Hamlet and his "madness", King Claudius has Hamlet deported to England to be killed when he fears he has become a threat.
Instead, Hamlet returns to Denmark, and King Claudius manipulates Laertes into killing Hamlet for him. Unfortunately, King Claudius' plan to poison Hamlet backfires, killing his beloved Queen Gertrude instead. In Act III, Scene III, King Claudius reveals his inner guilt and the knowledge that he cannot avoid God's judgment of him... Dies at the end of the play to the poison tipped sword of Hamlet.