Alya Césaire

(From the official Miraculous website)

Alya Césaire is Marinette’s BFF. Always connected, curious, relentlessly pursuing truth and justice, she wants to become a reporter. Alya shares a secret with her classmate and boyfriend Nino: they’re both superheroes.
Alya is the holder of the Miraculous of the fox, which grants the power of illusion. With the help of her kwami Trixx, she transforms into Rena Rouge, Ladybug’s very first hand-picked ally.