Serah Farron is a pivotal character in the Final Fantasy XIII series. She is the younger sister of Lightning, the protagonist, and plays a key role in the storyline. Known for her gentle and kind-hearted nature, Serah finds herself entangled in the complexities of the game’s plot as she becomes a l'Cie, marked by the fal'Cie and tasked with a daunting focus. Her transformation sets off a series of events that drive Lightning and her allies to fight against their fate, ultimately shaping the course of the series.