Clytemnestra
Queen of Argos and the play's real protagonist. She planned Agamemnon's murder over ten years, executed it herself, and defended it publicly. She is intelligent, controlled, and completely without remorse. Every scene she is in, she is the most powerful person in it.
Agamemnon
King of Argos and commander of the Greek forces at Troy. He returns victorious but walks into a trap. His willingness to sacrifice Iphigenia and his pride in accepting the purple robes both contribute to his death. He is on stage briefly but his choices drive the whole plot.
Cassandra
A Trojan princess taken by Agamemnon as a war prize. She has the gift of prophecy from Apollo, paired with the curse that no one believes her. She sees the murders coming, describes them to the chorus, and walks into the palace knowing she will die. Her scene is the emotional peak of the play.
Aegisthus
Clytemnestra's lover and co-conspirator. He claims the murder was justice for crimes Agamemnon's father committed against his family. The chorus treats him with contempt because he let a woman do the killing. He is politically ambitious but morally weak compared to Clytemnestra.
The Chorus of Argive Elders
Old men of Argos who represent the community. They know something is wrong, they half-understand Cassandra's visions, and they cannot act. They provide historical context, moral commentary, and a record of how ordinary people respond when power turns violent.
The Watchman
Opens the play from the palace roof. He is relieved the war is over but signals that the household is troubled. His brief scene sets the tone: something is being waited for, and it will not be good.
The Herald
Arrives before Agamemnon to announce the victory. He also reports the storm that destroyed much of the fleet. His scene grounds the play in the real cost of the war before the domestic tragedy takes over.