Collet Brunel is a central character in Tales of Symphonia the Animation: The United World Episode, serving as the female lead. Her background is that of a kind and selfless girl who was raised in the small village of Iselia in the world of Sylvarant. She is identified as the Chosen of Sylvarant, a being destined to save her dying world from destruction. Her name is also known in its localized form as Colette Brunel. From birth, she was marked by a Cruxis Crystal in her hand, signifying her role as the seventh Chosen of Regeneration, a destiny that weighed upon her from an early age. Raised by her adoptive father, Frank Brunel, and her grandmother, the priestess Phaidra, she was well aware that her journey to regenerate the world would ultimately require her to sacrifice her own life.

In terms of personality, Collet is defined by her profound selflessness and kindness, always placing the well-being of others before her own. This trait is so ingrained that she has a strong tendency to hide her own pain and suffering to prevent causing worry to her friends, often keeping serious ailments or emotional burdens a secret. She is also notably clumsy, with a habit of repeatedly tripping in situations that often lead to unexpectedly beneficial outcomes, such as deactivating complex machinery or creating new paths for her group. This clumsiness is sometimes paired with a certain obliviousness to obvious facts or social cues, though this does not diminish her genuine and forgiving nature, which allows her to smile and forgive almost any transgression. Her initial motivations are driven by a deep-seated belief that her life is a necessary sacrifice to save Sylvarant. She accepts this tragic duty with a cheerful facade, trying to make her departure easier for her childhood friend, Lloyd Irving, by lying about her departure time and masking her fear.

Collet's role in the story is as the focal point of the Journey of Regeneration. As the party travels to release the five seals, she begins to transform into an angel, gaining powers like wings and enhanced senses, but in exchange, she gradually loses her human functions, such as the ability to taste food, sleep, speak, and eventually, feel emotion. This transformation is part of a plot by the organization Cruxis, which intends for her to lose her soul and become the vessel for the resurrection of the goddess Martel. Throughout the journey, she is rescued from this fate and later suffers from a rare angelic disease known as Chronic Angelus Crystallus Inofficium, which causes her body to painfully crystallize, a condition she again tries to hide from her companions. Her key relationships include her deep bond with Lloyd Irving, whose unwavering belief that no one is born for the sole purpose of dying challenges her fatalistic worldview. She also travels closely with her teacher Raine Sage, her other childhood friend Genis Sage, and the mercenary Kratos Aurion.

Throughout the narrative, Collet undergoes significant character development. Initially resigned to her sacrificial role, she comes to recognize, largely through Lloyd's influence, that her willingness to sacrifice herself was a mistake. Her greatest wish evolves from saving the world through her own death to ensuring that no one else will ever have to make the same sacrifice. She transitions from a passive martyr accepting her destiny to an active guardian who fights for a future where all lives are valued. In terms of notable abilities, Collet is primarily a ranged fighter who wields two ring-shaped weapons known as chakrams, which she can throw at enemies. As she progresses on her journey, she gains a variety of angelic powers, including the ability to fly, and can learn powerful angel techniques in battle. Despite her clumsy and gentle demeanor, she is a loyal and effective combatant, utilizing her unique abilities to support her party and fight against those who would exploit her world.