Alya Césaire

Alya Césaire is Marinette's best friend and a student at Collège Françoise Dupont. She is also the sole admin of the Ladyblog and head of the school blog. In "Lady Wifi", after Alya gets suspended from school because of Chloé, she is infected with an akuma by Hawk Moth and becomes Lady Wifi, a cellphone and Wifi utilizing supervillain.

Appearance
Alya is brown-skinned and at a medium height with golden eyes. She has dark reddish-brown wavy hair that goes to her shoulders, the tips of her hair a lighter shade of red. Above her right eyebrow, she has a beauty mark.

She wears black-rimmed glasses with a light gray spot on each side, a white tank top underneath a plaid shirt with white, orange, and purple stripes, light blue jeans, and white sneakers with black tops.

As Lady Wifi, she has a black butterfly-shaped mask on her face, and her eyes are dark magenta. She wears a black suit, her lower arms and legs white with three white stripes above each. On her chest is a glowing light pink Wifi symbol, and a thin white line goes around her waist, with the line creating a semicircle above a short vertical white line in the front, resembling a power button.

Personality
Alya is a rather energetic and passionate yet down to earth and smart girl. She is extremely loyal, supportive, and helpful, like going out of her way to encourage and (sometimes literally) push Marinette into spending time with Adrien. Her cleverness and foresight have come in handy many times. After Marinette thinks she accidentally lost a video of Ladybug on Alya's cellphone, Alya explains that she had already posted the video on her blog, expecting something to go wrong when she showed Marinette the video. From thoroughly observing Ladybug and Cat Noir while in action, Alya has figured out the basics of the superhero's work, like breaking the akumatized object to stop the villain. She doesn't like being undermined or doubted by others, especially when it comes to her work.

Alya has a dramatic side to her personality as well, such as when she pretends to be a unicorn with Manon and when she makes an excuse to Adrien's photographer, who asks for her to be a support model for Adrien, so Marinette can do the modelling instead. When it comes of anything involving Ladybug and Cat Noir, Alya easily becomes very excited and basically has a single goal of updating her blog as soon as possible, like when she is kidnapped by the Pharaoh to be a sacrifice yet still records herself and livestreams the video on her blog in "The Pharaoh". She also tends to jump to conclusions, such as when she quickly suspects Chloé of being Ladybug after seeing the mayor's daughter with a Ladybug prop yo-yo and mistaking it for the real yo-yo. She is intent on finding out who the civilian identities of the two superheroes are, and is willing to follow almost any lead she is given towards that goal. Sometimes, she goes too far, like spying on Chloé's locker, which results in her getting punished by Mr. Damocles.

As Lady Wifi, her desire for answers increases considerably. Despising Ladybug's secrecy, she will stop at nothing to find out her secret identity, even if it means exposing a horrible person underneath, like when she believes that Ladybug is Chloé. Her speediness to update onlookers remains the same, but her methods for finding info become sneakier and harsher.

Marinette Dupain-Cheng/Ladybug
Alya and Marinette are best friends, often hanging out with each other or helping each other out with something. While amused by Marinette's inability to act normally around Adrien, Alya encourages her to talk and do things with or for him, like giving him a birthday present or inviting him to a movie. Alya is also very forgiving and accepting of Marinette's flaws, such as when Marinette accidentally deletes Alya's video of Ladybug (which resulted in the theft of Alya's phone for several hours), she immediately tells Marinette that it was no big deal, though she is disappointed Marinette had not told her sooner. Despite considering Marinette a ditz sometimes and perplexed by her constant disappearances, Alya loyally stands by her, and she appreciates Marinette's kindness.

Meanwhile, Alya is a huge fan of Ladybug, running a fan blog about her called Ladyblog. She is always trying to learn more about her, including her secret identity. In "The Pharaoh", she reveals that she has figured out that Ladybug must destroy an important object of a supervillain in order to defeat them, impressing Ladybug. She also seems aware that she and Cat Noir's transformations are only temporary. Her search for Ladybug's identity is relentless, one time mistaking Chloé, a cosplayer, for being Ladybug. As Lady Wifi, her frustration with her search intensifies, complaining how heroes should not hide their identities.

Adrien Agreste/Cat Noir
Alya is congenial with Adrien. Not sharing Marinette's nervousness around him, Alya talks to him with ease.

Though not as interested in Cat Noir as Ladybug, Alya is a fan of him, finding him cute. She is also searching for his alter ego, at one point contemplating it being Adrien.

Nino
Alya and Nino get along nicely, sharing their confusion in how Marinette and Adrien are always disappearing. Overhearing Nino suggest to Adrien that they go to the movies, Alya asks him if she and Marinette can join them. Also, without Marinette to help her discover if Chloé is Ladybug, Alya drags him along and has him distract her while she takes a photo of Chloé's locker. Sometimes, she will have disagreements with him. Alya works with Nino as a scriptwriter for Nino's homemade movie in "Horrificator", but it leads to issues when Alya finds out Nino added a kissing scene into her script without telling her.

Chloé Bourgeois
Like Marinette, Alya detests Chloé. She finds her snobby and rude, but she recognizes that Marinette is more likely to suffer with Chloé than she is herself, feeling sorry for Marinette when she and Chloé are partnered up for a school project. During her searches for Ladybug's identity, Alya spots Chloé with a Ladybug-themed towel and a Ladybug yo-yo, these findings misleading her to think Chloé is Ladybug. After Chloé discovers that Alya took a picture of her locker and gets her temporarily suspended, Alya, enraged by Ladybug having such a horrible alter ego, goes to unmask her after transforming into Lady Wifi. She continues to believe she's found Ladybug's true identity until the real Ladybug and Cat Noir appear to save a cosplaying Chloé from Lady Wifi's clutches.

Manon
Alya bonds very easily with Manon because of her experience with younger sisters. She pretends to be a unicorn princess, exciting Manon, and during their entrapment within a shield of ice by Stormy Weather, Alya tries to entertain her in order to distract her from their dilemma.

The Pharaoh
While it's not known if Alya knows that the Pharaoh is Jalil, she figures out that his necklace his important item that Ladybug needs to destroy. Captured by the Pharaoh, Alya is both frustrated by her kidnapping and thrilled to be a part of the action while waiting for Ladybug and Cat Noir to show up. She takes time to ask him questions about his plan, and as soon as she figures out that she is his sacrifice, she is terrified, using her recording to call out to Ladybug for help. Amusingly, though, when Ladybug is tricking the Pharaoh to sacrifice her instead of Alya, Alya takes it as an offense, annoyed that the Pharaoh doesn't think she is a good enough sacrifice.

Abilities
Alya is very tech savvy. She keeps up the school blog and Ladyblog with ease, uploading videos, streaming live recordings, and adding articles. She records with her cellphone, knowing how to download videos from them. Along with technological skills, Alya is a good writer, writing blogs for Ladybug and writing the script for Nino's film in "Horrificator". She excels at presenting herself in her videos, explaining situations when needed and usually keeping her cool if the situation gets dangerous, like with the Pharaoh. Observant and a quick thinker, Alya has figured out a lot of things about Ladybug, Cat Noir, and the villains they fight from watching them.

As a villain
As Lady Wifi, she uses her cellphone, which is the akumatized object, as her weapon. Swiping her phone, she can shoot out glowing pink icons: the icons of pause and stop freeze people, the icons with a padlock lock doors and limbs to a surface, and the icons with a camera film and broadcast videos projecting them in the sky and on all the screens of Paris. Additionally, Lady Wifi can teleport herself using cellphones and antennas. Wifi gives her power, but if the signal is too weak, she loses the abilities that come from her cellphone.

Sightings

 * Miraculous: Tales of Ladybug & Cat Noir Theme Song

Season 1

 * Every episode of season 1

Trivia

 * In Slavonic, "Alya" means "beautiful" or "scarlet," possibly a reference to her red-brown hair.
 * Alya is the most recurring character of the series, appearing in every episode, alongside Marinette, Adrien, Hawk Moth, Tikki, and Plagg.
 * In "The Evillustrator", Lady Wifi reappears in Nathanaël's fantasy, teaming up with Stormy Weather to attack Marinette.
 * Her family comes from the island Martinique.

Alya Césaire