1. Claudius: Hamlet's uncle, who is now the King of Denmark after the death of Hamlet's father, King Hamlet. Claudius is married to Hamlet's mother, Queen Gertrude.
2. Gertrude: Hamlet's mother, who married Claudius after the death of King Hamlet.
3. Polonius: Hamlet's former advisor and the father of Ophelia and Laertes.
4. Ophelia: Hamlet's former lover, the daughter of Polonius and the sister of Laertes.
5. Laertes: Hamlet's childhood friend, the son of Polonius and the brother of Ophelia.
6. Horatio: Hamlet's loyal friend and confidant.
7. King Hamlet (the Ghost): Hamlet's father, who appears as a ghost to Hamlet and reveals the truth about his murder by Claudius.