Lady Wifi

Lady Wifi is an antagonist in the Disney (UK & U.S) and Nickelodeon (US) show Miraculous Ladybug. She is Marinette's best friend Alya who turned to the dark side when she was evilized by the main villain Hawk Moth to become the supervillain "Lady Wifi".

Powers and Abilities

 * Technokinesis: she is able to swap icons using her cellphone as well as teleport through other phones and nearby antennas. She was also able to project a video of herself with the principal on both a physical screen and from a projector.
 * Hand-to-hand combat: she put up a great fight with Cat Noir.
 * Superhuman strength: she possessed a great amount of strength fighting Ladybug.

Weaknesses

 * Signal weakness: Lady Wifi relies on a strong Wi-Fi signal. If it is too weak, she will lose her powers over technology.

Lady Wifi
After Alya mistakenly thought that Chloé was Ladybug, Chloe gets her suspended from school, causing Alya to leave in anger. This exposes her to an akuma and transforms her into "Lady Wifi". Then she returns to the school and uses her powers to video the principal and afterwards, freeze him.

She proceeds to unveil Ladybug's identity. She teleported herself into Chloe's room, froze her, and unmasked her. But then Cat Noir and the true Ladybug appeared, much to her dismay.

When she finally trapped Ladybug in a hotel kitchen, she tried to take off her mask; but because it was magic, the mask didn't come off. Then she locked Cat Noir in the freezer, which knocked the ring off his finger.

The Evillustrator
She appears along with Stormy Weather in a daydream of Nathaniel Kurtzberg. In the dream, they work together to trap Marinette and succeed. But then, "Super Nathan" rescues her and traps the duo.

The Puppeteer
Alya becomes Lady Wifi against her will after the Puppeteer uses her powers to animate the doll resembling her. Puppeteer then used her to take the other dolls resembling Evillustator and Rogercop which Puppeteer also took control of; and after they were all gathered up, Evillustrator made her another phone to replace the one Ladybug and Cat Noir broke when they thought the akuma was in her phone again. After Cat Noir was possessed, Ladybug summoned her Lucky Charm; and then she tricked Lady Wifi into pausing Puppeteer, and thus, everyone else under her control. After Ladybug released the akuma from Puppeteer's wand and purified it, she restored everything to normal with Miraculous Ladybug, along with Alya, freeing her from her state.

Gamer 2.0
She was one of the akumatized villains Gamer 2.0 trapped inside his video game who later served as Cat Noir's avatar. She faced Timebreaker (who was Gamer's chosen avatar) and defeated her without fail. After Ladybug defeated Gamer 2.0, she freed Alya and everybody else with Miraculous Ladybug, before purifying the akuma.

The Puppeteer 2
Her statue comes to life after Puppeteer takes control of it, and then pauses Alya for Bubbler's statue to trap her. But while trying to trap Ladybug and Cat Noir

Mobile game
She appears as a boss in Miraculous Ladybug & Cat Noir. She appears to levitate while attacking. During the battle, she will swap Wi-Fi icons with exclamations on them as well as red pause icons the player can use to attack.

Toy line
She appears as an action figure.

Trivia

 * Since Alya was Rena Rouge, she wasn't akumatized into Lady Wifi again in the Heroes' Day special.