Alya Césaire is a student at Collége Françoise Dupont, superhero obsessed, the admin of the Ladyblog (social media page about superheroes), Marinette Dupain-Cheng's best friend and Nino Lahiffe's girlfriend. One day she receives the Fox Miraculous from Ladybug, which, when inhabited by the kwami Trixx, can transform her into Rena Rouge, a fox-themed superhero who has the power to create illusions and help Ladybug and Cat Noir. Her best friend Marinette tells Alya that she's Ladybug.