The Duchess's twin brother and a principal antagonist characterized by his aggressive and volatile nature. He is deeply opposed to the Duchess's remarriage and harbors disturbing intentions.

The Duchess's brother and a significant antagonist known for his Machiavellian tactics and corrupt nature. He opposes the Duchess's actions and demonstrates a ruthless desire for control and power.

A complex character who starts as an antagonist working for Ferdinand but evolves through the play. He is initially complicit in spying against the Duchess but wrestles with his conscience throughout the narrative.

The Duchess’s steward and secret husband, known for his capability, honesty, and love for the Duchess. He struggles with his lower status and the political machinations around him.

Antonio's loyal friend, who supports and advises him throughout the play. He attempts to guide Antonio through the court's challenges and delivers crucial reflections at the play's conclusion.