In Final Fantasy XIII, Serah is the first Pulse l'Cie in Cocoonand her destiny is one of the game's central plot points. In Final Fantasy XIII-2, Serah sets off on a journey with Noel to find Lightning when all others believe her to be dead.
Serah is an 18-year-old girl with the same pink tint of hair that Lightning has. She ties her hair into a ponytail on the left side of her head, much like how Lightning's hair is draped over her left shoulder. Serah has blue eyes like her sister, although Serah's are a darker shade.
She wears cat-shaped earrings representing NORA, a black armband on her right bicep like Lightning, red plaid pleated skirt lined with black lace, a white sleeveless dress shirt, a semi-transparent pink sweeper, an extra matching hair tie on her left wrist, black thigh-high stockings, ivory ankle boots, and a bandage on her left bicep, which she uses to cover her l'Cie brand. She eventually wears the engagement pendant she receives from Snow. Yoshinori Kitase describes Serah as "the cutest girl" in the game.
According to Final Fantasy XIII Episode Zero -Promise-, Serah is a straight-A student and one of her favorite subjects is history. Serah is depicted as mature and wise, deeply caring for those around her. Despite the grave circumstances, she stays positive and believes in a better future as long as she has her friends by her side.