Alya Césaire

Alya is Marinette's best friend. She constantly helps Marinette with her problems, most of which pertain to Marinette trying to speak to Adrien; she is often seen helping or encourage her. She aspires to be a journalist and is in charge of the school blog. She is a big fan of superheroes, in particular Ladybug; she even operates a fansite known as the Ladyblog, but like everyone else, is mostly unaware of Marinette's superhero identity, but Marinette later reveals herself to her.

She sometimes uses the Fox Miraculous to transform into "Rena Rouge". Her weapon is a flute that doubles as a staff and her special power, "Mirage", allows her to create illusions. Her transformation call is "Trixx, Let's Pounce!".

Although her identity is eventually revealed, Rena Rouge is often called upon throughout the series, and is eventually allowed to keep her Miraculous permanently. She ends up using it in hiding as "Rena Furtive", but is revealed nonetheless, so she returns the Miraculous.

Twice, she stands in for Ladybug, as the superhero "Scarabella".

Her villain form is "Lady Wifi", whose smartphone can fire magical icons and allows her to teleport through phones. Lady Wifi has sometimes teamed up with Princess Fragrance, Reflekta, and once with Horrificator and Timebreaker. She is the first villain to break free of Shadow Moth's control. As Rena Rouge, she has been akumatized into "Rena Rage". One time, she and her love interest Nino have been fused into "Oblivio", who can erase people's memories.

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