Cordelia is a central supporting character in the anime Romeo × Juliet, serving as the closest friend and confidante to the protagonist, Juliet Capulet. Her background is deeply tied to the tragic history of Neo Verona. As a child, she survived the Montague massacre that annihilated the Capulet family and their vassals. Cordelia's own relatives, who worked as Capulet vassals, perished in the same slaughter. Along with other survivors like Curio and Francisco, she dedicated her life to protecting and caring for the young Juliet, who was spirited away as an infant. Notably, Cordelia is not simply a servant; her relationship with Juliet is far more personal and sisterly.

In terms of personality, Cordelia is characterized by her kindness, her nurturing nature, and her deep sense of loyalty. She acts as a motherly older sister to Juliet, providing emotional support and practical care. She is also highly protective and pragmatic, often voicing concern for Juliet's safety. This is particularly evident when Juliet begins to fall in love with Romeo Montague; Cordelia is anxious about the relationship, understanding the immense danger that associating with their family's enemy poses to Juliet's hidden identity and life. Her worry stems not from a lack of faith in Juliet, but from a profound understanding of the risks and a desire to keep her safe.

Cordelia's primary motivation throughout the story is the protection and happiness of Juliet. Having lost her own family and her masters to Montague's cruelty, her life's purpose becomes ensuring Juliet survives and, if possible, finds joy. She is not driven by revenge or political ambition; instead, her actions are rooted in personal devotion. This motivation leads her to serve as Juliet's private confidante, a role that requires her to listen to Juliet's secrets and offer counsel, even when she disagrees with Juliet's choices.

Her role in the narrative is multifaceted. She is Juliet's emotional anchor, providing comfort in moments of distress and acting as a sounding board for Juliet's thoughts and feelings. She is also a key figure in the small resistance group hiding Juliet. While she may not be a frontline fighter, her contributions are emotional and domestic, ensuring the stability of their hidden household. Her relationship with Benvolio Montague, Romeo's best friend, introduces a subplot that mirrors the central romance but arrives at a more hopeful conclusion. Despite the enmity between their families' houses, Cordelia and Benvolio develop feelings for each other. This relationship culminates in their marriage during the series, a union that represents a bridge between the two feuding families. In a final gesture of selfless friendship, Cordelia hands her wedding bouquet to Juliet, symbolically passing her own wish for happiness to her dearest friend.

Throughout the series, Cordelia undergoes significant development, primarily in her capacity to trust in a future beyond survival. Initially focused solely on protecting Juliet, she learns to open her heart to Benvolio, allowing herself a chance at personal happiness. By the story's conclusion, she and Benvolio have started a family, having a child together. This outcome positions her as a symbol of the peaceful future and new generation that the tragic heroines and heroes could not live to see. While not a warrior, Cordelia possesses notable abilities in domestic management and caregiving; for instance, she trains Benvolio in household tasks like cooking and laundry when he resides with the Capulets. Her primary strength, however, lies in her emotional resilience and her unwavering loyalty, which prove essential to Juliet's journey.