Portia Clemenza di Ebe is the mother of Romeo and the wife of Leontes van de Montague, which makes her a duchess in the ruling family of Neo Verona. Fourteen years before the main events of the story, she was horrified by the bloody and cruel ambitions of her husband, who led the revolt that destroyed the Capulet family. Unwilling to associate herself with that violence, she reluctantly left her husband, her son, and the Montague name behind and went to live in a convent. That decision shaped the rest of her life, as she chose separation from her family over complicity in bloodshed.

In personality, Portia is a kind, intelligent, and understanding woman. She is gentle and approachable, and she always hopes that people can live together in peace and happiness. She spends her days in the convent praying for her son's well-being, and she is described as the only person who greets Romeo with a genuine smile, which is why he likes to visit her. Her warmth makes her a rare source of comfort in Romeo's life, in contrast to the cold and violent world of his father's court. Her primary motivations are peace, compassion, the protection of her son, and a desire to make amends for the suffering her family has caused.

Within the story, Portia serves as a quiet moral anchor and a confidante for Romeo. She is perceptive enough to recognize the truth about his feelings, and just before the Flower Festival she confirms Romeo's theory that Juliet is a member of the House of Capulet. Although she is sympathetic to the bond her son has formed, she tries to dissuade him from pursuing a love that she knows can only bring tragedy, but Romeo boldly declares his love for Juliet anyway. Later, after the Montagues attack the Capulet restoration group, she gives shelter to a distressed Juliet in the convent and expresses deep regret over the massacre of the Capulet family. When Montague confronts her and demands information about Juliet and Romeo, she refuses to disclose anything, standing firm against her husband despite the danger. Her quiet act of defiance shows that her moral convictions are stronger than her fear of him. Near the end of the story, before the final raid on Montague, Romeo visits her and apologizes in advance for drawing his sword against his own father. She asks him whether this is truly the path his love must take, and he leaves without answering.

Her key relationships are defined by this moral conflict. With Romeo, she is a loving but sorrowful mother who wants only his happiness while knowing she cannot protect him from his fate. With Montague, she is estranged and disapproving, having left him because of his cruelty, and she refuses to help him even when pressured. With Juliet, she becomes an unexpected ally and protector, providing safety and compassion to the young woman her own family has persecuted. Her development is subtle but meaningful: she moves from a passive figure who withdrew from the world in horror to someone who actively shelters the innocent, protects Romeo's secret, and quietly challenges the injustice carried out in her husband's name.

Portia has no combat abilities or supernatural powers. Her notable strengths are her perceptiveness, her intelligence, and her moral courage. She is able to see through appearances and recognize hidden truths, such as Juliet's identity, and she possesses the resilience to endure isolation and intimidation without betraying her principles. Her greatest ability is the trust and affection she inspires in others, especially in Romeo, who regards her as his one source of warmth in a hostile world. She remains a gentle, sorrowful presence throughout the series, defined by her love for her son and her unwavering commitment to peace and compassion.